Perpetual benchmark thread... - Page 29

petrw1 · 2016-07-28, 18:09

To interleave that is.

Or if I find the current 8GB stick is 1600 and I add a 2133 8Gb stick will it still interleave and get full dual-channel memory sharing?

James Heinrich · 2016-07-28, 18:37

Probably, but they'll both run at 1600, so you're wasting your money on faster RAM.

petrw1 · 2016-07-31, 17:36

Quote:

Originally Posted by petrw1

To interleave that is.

Or if I find the current 8GB stick is 1600 and I add a 2133 8Gb stick will it still interleave and get full dual-channel memory sharing?

He opened the box and found the RAM was DDR3 833 (is that even possible nowadays)

Anyway if the benchmark gave him 7.68 ms for 2048 FFT on 1 core (equivalent to other similar CPUs); actual speeds of 16ms for all 4 cores concurrent; can I expect it to be a lot faster, that is I'm thinking 2400 or even 2133 DDR3 may be overkill; more than I need

Thoughts....

James Heinrich · 2016-07-31, 18:09

Quote:

Originally Posted by petrw1

found the RAM was DDR3 833 (is that even possible nowadays)

No?
I believe the spec starts at 800 and goes up in 266 increments (800, 1066, 1333, 1600, 1866, 2133, 2400, etc).

petrw1 · 2016-08-01, 03:45

Quote:

Originally Posted by James Heinrich

No?
I believe the spec starts at 800 and goes up in 266 increments (800, 1066, 1333, 1600, 1866, 2133, 2400, etc).

I stand corrected....800 it is.

Same question though. Is it possible that could be capable of 7.68Ms times for 2048K FFT.

If so at what RAM speed do I no longer get improvements...is the MB or CPU, etc become the bottleneck.

sdbardwick · 2016-08-01, 04:09

Might be 1333 rather than 800; tiny "1" in close proximity to "3" looks like an "8".

Mark Rose · 2016-08-01, 04:45

Well, a i7-6700 probably takes DDR4. The lowest common speed for DDR4 is 2133 MHz.

Get a stick of DDR4-2133 that matches the size of one of the existing sticks.

henryzz · 2016-08-01, 09:10

Quote:

Originally Posted by Mark Rose

Well, a i7-6700 probably takes DDR4. The lowest common speed for DDR4 is 2133 MHz.

Get a stick of DDR4-2133 that matches the size of one of the existing sticks.

Assuming the motherboard does. It is unlikely that you would be able to replace ddr3 with ddr4. The sockets at least are different. There may be motherboards that support both.

petrw1 · 2016-08-26, 21:48

2X8GB DDR3 - 1866 and 2400 both under $100 ... what's that catch?

http://www.newegg.ca/Product/Product...82E16820104467

http://www.newegg.ca/Product/Product...82E16820233585

James Heinrich · 2016-08-26, 22:19

11-13-13 vs 10-11-10 CAS timings

petrw1 · 2016-08-26, 22:23

Quote:

Originally Posted by James Heinrich

11-13-13 vs 10-11-10 CAS timings

Yeah I noticed bit it didn't seem like a lot.
Does that CAS difference make up for the speed difference?
In other words which is likely to perform better for GIMPS?

James Heinrich · 2016-08-26, 22:26

If your board can actually support DDR3-2400 then you're probably better with CAS11@2400 than CAS10@1866, but whether it will make any appreciable difference I can't say. I'm sure others can.

petrw1 · 2016-08-26, 22:47

Quote:

Originally Posted by James Heinrich

If your board can actually support DDR3-2400 then you're probably better with CAS11@2400 than CAS10@1866, but whether it will make any appreciable difference I can't say. I'm sure others can.

Can anyone easily tell me if this will support 2400 DDR3?

Acer Aspire T3-710 V:1.1

Mark Rose · 2016-08-26, 22:58

Quote:

Originally Posted by petrw1

Can anyone easily tell me if this will support 2400 DDR3?

Acer Aspire T3-710 V:1.1

This machine? http://www.acer.com/ac/en/SG/content/model/DT.B1HSG.001

It takes DDR3L-1600 at 1.35V.

The memory at both those links won't work. Try this:

http://www.newegg.ca/Product/Product...82E16820156047

James Heinrich · 2016-08-26, 23:00

Quote:

Originally Posted by petrw1

Acer Aspire

As a generalization: Probably not. "Brand name" systems tend to be equipped with parts that are just sufficient to run at their specified settings and no more. Greater abilities mean greater cost, and Acer's not going to pay for 2400MHz RAM support when they're only planning on putting 1333 (or whatever stock is) in there. If you didn't pick the motherboard and build the system yourself (or have your friend/store building it for you) then I wouldn't expect anything above 1600 (if that) to be supported on any brand-name system.

Mark Rose · 2016-08-27, 00:59

i5-6600 with DDR-2133:

[Work thread Aug 24 10:24] Benchmarking multiple workers to measure the impact of memory bandwidth
[Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 2.57 ms. Total throughput: 388.96 iter/sec.
[Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 5.30, 5.30 ms. Total throughput: 377.27 iter/sec.
[Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 10.71, 10.71, 10.71, 10.71 ms. Total throughput: 373.41 iter/sec.
...
[Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 5.40 ms. Total throughput: 185.15 iter/sec.
[Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 10.88, 10.78 ms. Total throughput: 184.67 iter/sec.
[Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 21.67, 21.70, 21.65, 21.64 ms. Total throughput: 184.64 iter/sec.

Stock-clocked i7-4770k with DDR3-2400:

[Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 2.63 ms. Total throughput: 380.55 iter/sec.
[Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 5.90, 5.58 ms. Total throughput: 348.60 iter/sec.
[Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 10.49, 10.42, 10.54, 10.42 ms. Total throughput: 382.13 iter/sec.
[Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 1 worker. Average times: 3.56 ms. Total throughput: 280.91 iter/sec.
[Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 2 workers. Average times: 6.81, 6.80 ms. Total throughput: 294.08 iter/sec.
[Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 4 workers. Average times: 13.53, 13.56, 13.67, 13.58 ms. Total throughput: 294.46 iter/sec.
[Work thread Aug 24 10:31] Timing 3072K FFT, 4 cpus, 1 worker. Average times: 4.36 ms. Total throughput: 229.51 iter/sec.
[Work thread Aug 24 10:31] Timing 3072K FFT, 4 cpus, 2 workers. Average times: 8.07, 8.09 ms. Total throughput: 247.56 iter/sec.
[Work thread Aug 24 10:32] Timing 3072K FFT, 4 cpus, 4 workers. Average times: 16.12, 16.11, 16.25, 16.13 ms. Total throughput: 247.63 iter/sec.
[Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 1 worker. Average times: 4.81 ms. Total throughput: 207.94 iter/sec.
[Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 2 workers. Average times: 9.69, 9.66 ms. Total throughput: 206.67 iter/sec.
[Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 4 workers. Average times: 19.07, 18.99, 18.99, 19.09 ms. Total throughput: 210.14 iter/sec.
[Work thread Aug 24 10:32] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 5.51 ms. Total throughput: 181.46 iter/sec.
[Work thread Aug 24 10:33] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 10.85, 10.83 ms. Total throughput: 184.52 iter/sec.
[Work thread Aug 24 10:33] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 21.96, 21.98, 21.76, 21.81 ms. Total throughput: 182.84 iter/sec.

And a 4770 with DDR3-1600:

[Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 1 worker. Average times: 1.31 ms. Total throughput: 760.95 iter/sec.
[Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 2 workers. Average times: 3.30, 3.70 ms. Total throughput: 573.21 iter/sec.
[Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 4 workers. Average times: 7.04, 7.16, 7.98, 7.27 ms. Total throughput: 544.37 iter/sec.
[Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 1 worker. Average times: 1.99 ms. Total throughput: 502.73 iter/sec.
[Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 2 workers. Average times: 4.38, 4.43 ms. Total throughput: 453.94 iter/sec.
[Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 4 workers. Average times: 9.18, 9.07, 9.10, 9.17 ms. Total throughput: 438.16 iter/sec.
[Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 1 worker. Average times: 2.43 ms. Total throughput: 411.77 iter/sec.
[Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 2 workers. Average times: 5.29, 5.44 ms. Total throughput: 372.94 iter/sec.
[Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 4 workers. Average times: 10.91, 10.94, 11.06, 11.04 ms. Total throughput: 363.99 iter/sec.
[Work thread Aug 26 20:49] Timing 1792K FFT, 4 cpus, 1 worker. Average times: 3.06 ms. Total throughput: 326.68 iter/sec.
[Work thread Aug 26 20:49] Timing 1792K FFT, 4 cpus, 2 workers. Average times: 6.55, 6.56 ms. Total throughput: 305.11 iter/sec.
[Work thread Aug 26 20:50] Timing 1792K FFT, 4 cpus, 4 workers. Average times: 13.18, 13.22, 13.06, 13.43 ms. Total throughput: 302.52 iter/sec.
[Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 3.49 ms. Total throughput: 286.67 iter/sec.
[Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 8.08, 7.51 ms. Total throughput: 256.88 iter/sec.
[Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 14.76, 15.04, 14.82, 15.09 ms. Total throughput: 267.96 iter/sec.
[Work thread Aug 26 20:50] Timing 2560K FFT, 4 cpus, 1 worker. Average times: 4.63 ms. Total throughput: 216.13 iter/sec.
[Work thread Aug 26 20:51] Timing 2560K FFT, 4 cpus, 2 workers. Average times: 9.50, 9.62 ms. Total throughput: 209.26 iter/sec.
[Work thread Aug 26 20:51] Timing 2560K FFT, 4 cpus, 4 workers. Average times: 18.46, 19.41, 19.10, 18.90 ms. Total throughput: 210.98 iter/sec.
[Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 1 worker. Average times: 5.66 ms. Total throughput: 176.75 iter/sec.
[Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 2 workers. Average times: 11.60, 11.86 ms. Total throughput: 170.48 iter/sec.
[Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 4 workers. Average times: 23.17, 22.32, 22.55, 23.19 ms. Total throughput: 175.43 iter/sec.
[Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 1 worker. Average times: 6.68 ms. Total throughput: 149.66 iter/sec.
[Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 2 workers. Average times: 13.62, 13.55 ms. Total throughput: 147.24 iter/sec.
[Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 4 workers. Average times: 26.65, 26.95, 27.47, 27.59 ms. Total throughput: 147.27 iter/sec.
[Work thread Aug 26 20:52] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 8.05 ms. Total throughput: 124.17 iter/sec.
[Work thread Aug 26 20:52] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 15.30, 15.29 ms. Total throughput: 130.74 iter/sec.
[Work thread Aug 26 20:53] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 30.15, 30.57, 30.68, 30.75 ms. Total throughput: 131.00 iter/sec.

petrw1 · 2016-08-31, 16:53

Quote:

Originally Posted by Mark Rose

This machine? http://www.acer.com/ac/en/SG/content/model/DT.B1HSG.001

It takes DDR3L-1600 at 1.35V.

The memory at both those links won't work. Try this:

http://www.newegg.ca/Product/Product...82E16820156047

I really appreciate the help (from all of you) but what in the first link tells me it can only handle DDR3-1600 at 1.35V?

Mark Rose · 2016-08-31, 17:25

Quote:

Originally Posted by petrw1

I really appreciate the help (from all of you) but what in the first link tells me it can only handle DDR3-1600 at 1.35V?

It's a specification of the CPU. http://ark.intel.com/products/88185/...up-to-3_30-GHz

When it's being used with DDR3, which is what the Acer page says the motherboard takes, it's limited to 1600 MHz and it must be low voltage DDR3, or DDR3L.

petrw1 · 2016-09-12, 04:47

Quote:

Originally Posted by Mark Rose

It's a specification of the CPU. http://ark.intel.com/products/88185/...up-to-3_30-GHz

When it's being used with DDR3, which is what the Acer page says the motherboard takes, it's limited to 1600 MHz and it must be low voltage DDR3, or DDR3L.

So we ordered and installed 2X8G DDR3 - 1600 but CPU-Z says it is running at 800. Is it a simple MB-Settings thing or are we SOL.

The before and after benchmarks are virtually the same but 4 cores doing DC-LL is about 12% faster due to balanced Dual RAM.

henryzz · 2016-09-12, 13:16

Quote:

Originally Posted by petrw1

So we ordered and installed 2X8G DDR3 - 1600 but CPU-Z says it is running at 800. Is it a simple MB-Settings thing or are we SOL.

The before and after benchmarks are virtually the same but 4 cores doing DC-LL is about 12% faster due to balanced Dual RAM.

Cpu-z usually reports half the speed.

petrw1 · 2016-09-12, 16:18

Quote:

Originally Posted by petrw1

So we ordered and installed 2X8G DDR3 - 1600 but CPU-Z says it is running at 800. Is it a simple MB-Settings thing or are we SOL.

The before and after benchmarks are virtually the same but 4 cores doing DC-LL is about 12% faster due to balanced Dual RAM.

Correction 25% faster.

17 to under 13 ms on a 37.5M DC for all 4 cores

Benchmark says it should be 13.5 for a 2048FFT with 4 cores....seems he is doing a little better
(7.68 for 1 core alone)

Antonio · 2016-09-12, 16:46

Quote:

Originally Posted by henryzz

Cpu-z usually reports half the speed.

Cpu-z gives the memory clock speed correctly. The factor of 2 difference comes from DDR memory transferring data on both the rising and the falling edge of the clock.

petrw1 · 2016-09-12, 17:22

Quote:

Originally Posted by Antonio

Cpu-z gives the memory clock speed correctly. The factor of 2 difference comes from DDR memory transferring data on both the rising and the falling edge of the clock.

So to clarify if CPU-Z says 800 then for some reason my RAM is running at 800 and not 1600 as it is capable of?

If so is there anything I can do to get to that speed?
Or will that make no difference, that is, will the MB or some other component limit me to 800 anyway?

kladner · 2016-09-12, 17:27

Quote:

Originally Posted by petrw1

So to clarify if CPU-Z says 800 then for some reason my RAM is running at 800 and not 1600 as it is capable of?

If so is there anything I can do to get to that speed?
Or will that make no difference, that is, will the MB or some other component limit me to 800 anyway?

Your RAM is running at the correct speed. As explained, DDR RAM gets two operations per clock cycle. CPUZ reports the base clock, not what the RAM is doing.

James Heinrich · 2016-09-13, 03:40

https://en.wikipedia.org/wiki/Double_data_rate

The RAM is running on an 800MHz (million cycles per second) clock, and transferring data at 1600MT/s (million transactions per second). Both are correct, even if that is confusing.

2016-07-28, 18:09	#701
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3·5·313 Posts	And finally I assume they also must be same speed? To interleave that is. Or if I find the current 8GB stick is 1600 and I add a 2133 8Gb stick will it still interleave and get full dual-channel memory sharing?

2016-08-26, 21:48	#709
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3·5·313 Posts	Expert opinion? 2X8GB DDR3 - 1866 and 2400 both under $100 ... what's that catch? http://www.newegg.ca/Product/Product...82E16820104467 http://www.newegg.ca/Product/Product...82E16820233585

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2016-07-28, 18:37	#702
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 23·149 Posts	Probably, but they'll both run at 1600, so you're wasting your money on faster RAM.

2016-08-01, 04:09	#706
sdbardwick Aug 2002 North San Diego County 5·137 Posts	Might be 1333 rather than 800; tiny "1" in close proximity to "3" looks like an "8".

2016-08-01, 04:45	#707
Mark Rose "/X\(‘-‘)/X\" Jan 2013 2×5×293 Posts	Well, a i7-6700 probably takes DDR4. The lowest common speed for DDR4 is 2133 MHz. Get a stick of DDR4-2133 that matches the size of one of the existing sticks.

2016-08-26, 22:19	#710
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 23×149 Posts	11-13-13 vs 10-11-10 CAS timings

2016-08-26, 22:26	#712
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 23·149 Posts	If your board can actually support DDR3-2400 then you're probably better with CAS11@2400 than CAS10@1866, but whether it will make any appreciable difference I can't say. I'm sure others can.

2016-08-27, 00:59	#716
Mark Rose "/X\(‘-‘)/X\" Jan 2013 2×5×293 Posts	i5-6600 with DDR-2133: [Work thread Aug 24 10:24] Benchmarking multiple workers to measure the impact of memory bandwidth [Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 2.57 ms. Total throughput: 388.96 iter/sec. [Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 5.30, 5.30 ms. Total throughput: 377.27 iter/sec. [Work thread Aug 24 10:27] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 10.71, 10.71, 10.71, 10.71 ms. Total throughput: 373.41 iter/sec. ... [Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 5.40 ms. Total throughput: 185.15 iter/sec. [Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 10.88, 10.78 ms. Total throughput: 184.67 iter/sec. [Work thread Aug 24 10:29] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 21.67, 21.70, 21.65, 21.64 ms. Total throughput: 184.64 iter/sec. Stock-clocked i7-4770k with DDR3-2400: [Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 2.63 ms. Total throughput: 380.55 iter/sec. [Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 5.90, 5.58 ms. Total throughput: 348.60 iter/sec. [Work thread Aug 24 10:30] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 10.49, 10.42, 10.54, 10.42 ms. Total throughput: 382.13 iter/sec. [Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 1 worker. Average times: 3.56 ms. Total throughput: 280.91 iter/sec. [Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 2 workers. Average times: 6.81, 6.80 ms. Total throughput: 294.08 iter/sec. [Work thread Aug 24 10:31] Timing 2560K FFT, 4 cpus, 4 workers. Average times: 13.53, 13.56, 13.67, 13.58 ms. Total throughput: 294.46 iter/sec. [Work thread Aug 24 10:31] Timing 3072K FFT, 4 cpus, 1 worker. Average times: 4.36 ms. Total throughput: 229.51 iter/sec. [Work thread Aug 24 10:31] Timing 3072K FFT, 4 cpus, 2 workers. Average times: 8.07, 8.09 ms. Total throughput: 247.56 iter/sec. [Work thread Aug 24 10:32] Timing 3072K FFT, 4 cpus, 4 workers. Average times: 16.12, 16.11, 16.25, 16.13 ms. Total throughput: 247.63 iter/sec. [Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 1 worker. Average times: 4.81 ms. Total throughput: 207.94 iter/sec. [Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 2 workers. Average times: 9.69, 9.66 ms. Total throughput: 206.67 iter/sec. [Work thread Aug 24 10:32] Timing 3584K FFT, 4 cpus, 4 workers. Average times: 19.07, 18.99, 18.99, 19.09 ms. Total throughput: 210.14 iter/sec. [Work thread Aug 24 10:32] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 5.51 ms. Total throughput: 181.46 iter/sec. [Work thread Aug 24 10:33] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 10.85, 10.83 ms. Total throughput: 184.52 iter/sec. [Work thread Aug 24 10:33] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 21.96, 21.98, 21.76, 21.81 ms. Total throughput: 182.84 iter/sec. And a 4770 with DDR3-1600: [Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 1 worker. Average times: 1.31 ms. Total throughput: 760.95 iter/sec. [Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 2 workers. Average times: 3.30, 3.70 ms. Total throughput: 573.21 iter/sec. [Work thread Aug 26 20:48] Timing 1024K FFT, 4 cpus, 4 workers. Average times: 7.04, 7.16, 7.98, 7.27 ms. Total throughput: 544.37 iter/sec. [Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 1 worker. Average times: 1.99 ms. Total throughput: 502.73 iter/sec. [Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 2 workers. Average times: 4.38, 4.43 ms. Total throughput: 453.94 iter/sec. [Work thread Aug 26 20:48] Timing 1280K FFT, 4 cpus, 4 workers. Average times: 9.18, 9.07, 9.10, 9.17 ms. Total throughput: 438.16 iter/sec. [Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 1 worker. Average times: 2.43 ms. Total throughput: 411.77 iter/sec. [Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 2 workers. Average times: 5.29, 5.44 ms. Total throughput: 372.94 iter/sec. [Work thread Aug 26 20:49] Timing 1536K FFT, 4 cpus, 4 workers. Average times: 10.91, 10.94, 11.06, 11.04 ms. Total throughput: 363.99 iter/sec. [Work thread Aug 26 20:49] Timing 1792K FFT, 4 cpus, 1 worker. Average times: 3.06 ms. Total throughput: 326.68 iter/sec. [Work thread Aug 26 20:49] Timing 1792K FFT, 4 cpus, 2 workers. Average times: 6.55, 6.56 ms. Total throughput: 305.11 iter/sec. [Work thread Aug 26 20:50] Timing 1792K FFT, 4 cpus, 4 workers. Average times: 13.18, 13.22, 13.06, 13.43 ms. Total throughput: 302.52 iter/sec. [Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 1 worker. Average times: 3.49 ms. Total throughput: 286.67 iter/sec. [Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 2 workers. Average times: 8.08, 7.51 ms. Total throughput: 256.88 iter/sec. [Work thread Aug 26 20:50] Timing 2048K FFT, 4 cpus, 4 workers. Average times: 14.76, 15.04, 14.82, 15.09 ms. Total throughput: 267.96 iter/sec. [Work thread Aug 26 20:50] Timing 2560K FFT, 4 cpus, 1 worker. Average times: 4.63 ms. Total throughput: 216.13 iter/sec. [Work thread Aug 26 20:51] Timing 2560K FFT, 4 cpus, 2 workers. Average times: 9.50, 9.62 ms. Total throughput: 209.26 iter/sec. [Work thread Aug 26 20:51] Timing 2560K FFT, 4 cpus, 4 workers. Average times: 18.46, 19.41, 19.10, 18.90 ms. Total throughput: 210.98 iter/sec. [Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 1 worker. Average times: 5.66 ms. Total throughput: 176.75 iter/sec. [Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 2 workers. Average times: 11.60, 11.86 ms. Total throughput: 170.48 iter/sec. [Work thread Aug 26 20:51] Timing 3072K FFT, 4 cpus, 4 workers. Average times: 23.17, 22.32, 22.55, 23.19 ms. Total throughput: 175.43 iter/sec. [Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 1 worker. Average times: 6.68 ms. Total throughput: 149.66 iter/sec. [Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 2 workers. Average times: 13.62, 13.55 ms. Total throughput: 147.24 iter/sec. [Work thread Aug 26 20:52] Timing 3584K FFT, 4 cpus, 4 workers. Average times: 26.65, 26.95, 27.47, 27.59 ms. Total throughput: 147.27 iter/sec. [Work thread Aug 26 20:52] Timing 4096K FFT, 4 cpus, 1 worker. Average times: 8.05 ms. Total throughput: 124.17 iter/sec. [Work thread Aug 26 20:52] Timing 4096K FFT, 4 cpus, 2 workers. Average times: 15.30, 15.29 ms. Total throughput: 130.74 iter/sec. [Work thread Aug 26 20:53] Timing 4096K FFT, 4 cpus, 4 workers. Average times: 30.15, 30.57, 30.68, 30.75 ms. Total throughput: 131.00 iter/sec.

2016-09-13, 03:40	#725
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 23·149 Posts	https://en.wikipedia.org/wiki/Double_data_rate The RAM is running on an 800MHz (million cycles per second) clock, and transferring data at 1600MT/s (million transactions per second). Both are correct, even if that is confusing.