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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.

[QUOTE=Mark Rose;440799]This machine? [url]http://www.acer.com/ac/en/SG/content/model/DT.B1HSG.001[/url]

It takes DDR3[b]L[/b]-1600 at 1.35V.

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

[url]http://www.newegg.ca/Product/Product.aspx?Item=N82E16820156047[/url][/QUOTE]

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?

[QUOTE=petrw1;441206]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?[/QUOTE]

It's a specification of the CPU. [url]http://ark.intel.com/products/88185/Intel-Core-i5-6400-Processor-6M-Cache-up-to-3_30-GHz[/url]

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.

[QUOTE=Mark Rose;441215]It's a specification of the CPU. [url]http://ark.intel.com/products/88185/Intel-Core-i5-6400-Processor-6M-Cache-up-to-3_30-GHz[/url]

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.[/QUOTE]

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.

[QUOTE=petrw1;442279]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.[/QUOTE]

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)

[QUOTE=henryzz;442309]Cpu-z usually reports half the speed.[/QUOTE]

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.

[QUOTE=Antonio;442324]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.[/QUOTE]

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?

[QUOTE=petrw1;442330]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?[/QUOTE]
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.

[url]https://en.wikipedia.org/wiki/Double_data_rate[/url]

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.

Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
CPU speed: 3557.21 MHz, 4 cores
CPU features: 3DNow!, SSE, SSE2, SSE4, AVX
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 28.10, RdtscTiming=1

Timing FFTs using 1 thread.
Best time for 1024K FFT length: 9.508 ms., avg: 9.768 ms.
Best time for 1280K FFT length: 12.303 ms., avg: 12.418 ms.
Best time for 1536K FFT length: 14.999 ms., avg: 15.142 ms.
Best time for 1792K FFT length: 18.287 ms., avg: 18.356 ms.
Best time for 2048K FFT length: 20.227 ms., avg: 20.361 ms.
Best time for 2560K FFT length: 26.262 ms., avg: 26.380 ms.
Best time for 3072K FFT length: 31.668 ms., avg: 31.762 ms.
Best time for 3584K FFT length: 38.144 ms., avg: 38.364 ms.
Best time for 4096K FFT length: 42.237 ms., avg: 42.404 ms.
Best time for 5120K FFT length: 54.871 ms., avg: 54.996 ms.
Best time for 6144K FFT length: 68.655 ms., avg: 68.826 ms.
Best time for 7168K FFT length: 82.420 ms., avg: 82.663 ms.
Best time for 8192K FFT length: 90.886 ms., avg: 91.456 ms.

Timing FFTs using 2 threads.
Best time for 1024K FFT length: 4.864 ms., avg: 4.918 ms.
Best time for 1280K FFT length: 6.314 ms., avg: 6.388 ms.
Best time for 1536K FFT length: 7.647 ms., avg: 7.741 ms.
Best time for 1792K FFT length: 9.385 ms., avg: 9.449 ms.
Best time for 2048K FFT length: 10.340 ms., avg: 10.423 ms.
Best time for 2560K FFT length: 13.370 ms., avg: 13.465 ms.
Best time for 3072K FFT length: 16.091 ms., avg: 16.292 ms.
Best time for 3584K FFT length: 19.393 ms., avg: 19.624 ms.
Best time for 4096K FFT length: 21.453 ms., avg: 21.588 ms.
Best time for 5120K FFT length: 27.850 ms., avg: 28.476 ms.
Best time for 6144K FFT length: 34.854 ms., avg: 35.100 ms.
Best time for 7168K FFT length: 41.837 ms., avg: 42.006 ms.
Best time for 8192K FFT length: 46.029 ms., avg: 46.188 ms.

Timing FFTs using 3 threads.
Best time for 1024K FFT length: 3.412 ms., avg: 3.462 ms.
Best time for 1280K FFT length: 4.457 ms., avg: 4.533 ms.
Best time for 1536K FFT length: 5.287 ms., avg: 5.401 ms.
Best time for 1792K FFT length: 6.556 ms., avg: 6.645 ms.
Best time for 2048K FFT length: 7.277 ms., avg: 7.350 ms.
Best time for 2560K FFT length: 9.316 ms., avg: 9.495 ms.
Best time for 3072K FFT length: 11.275 ms., avg: 11.354 ms.
Best time for 3584K FFT length: 13.431 ms., avg: 13.660 ms.
Best time for 4096K FFT length: 14.977 ms., avg: 15.127 ms.
Best time for 5120K FFT length: 19.226 ms., avg: 19.463 ms.
Best time for 6144K FFT length: 24.403 ms., avg: 24.689 ms.
Best time for 7168K FFT length: 28.934 ms., avg: 29.159 ms.
Best time for 8192K FFT length: 31.774 ms., avg: 32.199 ms.

Timing FFTs using 4 threads.
Best time for 1024K FFT length: 2.730 ms., avg: 2.804 ms.
Best time for 1280K FFT length: 3.577 ms., avg: 3.688 ms.
Best time for 1536K FFT length: 4.234 ms., avg: 4.320 ms.
Best time for 1792K FFT length: 5.218 ms., avg: 5.423 ms.
Best time for 2048K FFT length: 5.985 ms., avg: 6.203 ms.
Best time for 2560K FFT length: 7.661 ms., avg: 7.855 ms.
Best time for 3072K FFT length: 9.270 ms., avg: 9.394 ms.
Best time for 3584K FFT length: 11.039 ms., avg: 11.281 ms.
Best time for 4096K FFT length: 12.421 ms., avg: 12.651 ms.
Best time for 5120K FFT length: 15.811 ms., avg: 15.986 ms.
Best time for 6144K FFT length: 20.161 ms., avg: 20.647 ms.
Best time for 7168K FFT length: 23.814 ms., avg: 24.115 ms.
Best time for 8192K FFT length: 26.010 ms., avg: 26.269 ms.

Timings for 1024K FFT length (4 cpus, 4 workers): 11.17, 11.15, 11.15, 11.16 ms. Throughput: 358.47 iter/sec.
Timings for 1280K FFT length (4 cpus, 4 workers): 14.62, 14.55, 14.55, 14.57 ms. Throughput: 274.43 iter/sec.
Timings for 1536K FFT length (4 cpus, 4 workers): 16.92, 16.81, 16.74, 16.74 ms. Throughput: 238.06 iter/sec.
Timings for 1792K FFT length (4 cpus, 4 workers): 20.66, 20.37, 20.73, 20.36 ms. Throughput: 194.87 iter/sec.
Timings for 2048K FFT length (4 cpus, 4 workers): 26.05, 25.39, 26.14, 26.14 ms. Throughput: 154.29 iter/sec.
Timings for 2560K FFT length (4 cpus, 4 workers): 28.62, 28.13, 28.07, 28.23 ms. Throughput: 141.54 iter/sec.
Timings for 3072K FFT length (4 cpus, 4 workers): 37.11, 38.15, 36.84, 37.20 ms. Throughput: 107.18 iter/sec.
Timings for 3584K FFT length (4 cpus, 4 workers): 42.48, 42.02, 41.94, 42.10 ms. Throughput: 94.94 iter/sec.
Timings for 4096K FFT length (4 cpus, 4 workers): 47.66, 47.15, 46.92, 46.69 ms. Throughput: 84.92 iter/sec.
Timings for 5120K FFT length (4 cpus, 4 workers): 61.24, 60.11, 59.79, 60.09 ms. Throughput: 66.33 iter/sec.
Timings for 6144K FFT length (4 cpus, 4 workers): 75.05, 74.09, 73.57, 74.10 ms. Throughput: 53.91 iter/sec.
Timings for 7168K FFT length (4 cpus, 4 workers): 92.21, 90.88, 90.51, 91.44 ms. Throughput: 43.83 iter/sec.
Timings for 8192K FFT length (4 cpus, 4 workers): 106.61, 108.07, 111.84, 106.36 ms. Throughput: 36.98 iter/sec.