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Old 2012-10-26, 18:20   #1
ig1
 
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Default Optimal prime 95 hardware platform?

If I wanted to build a farm of Prime95 workers what hardware configuration would give me the best iteration time for my buck?
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Old 2012-10-26, 18:29   #2
kracker
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Quote:
Originally Posted by ig1 View Post
If I wanted to build a farm of Prime95 workers what hardware configuration would give me the best iteration time for my buck?
It all depends on what you want, how much money you're willing on.
For CPU, I would recommend a Intel i5-3550k..but it just all depends.

GPU's are much, much more efficient at TF'ing than CPU's at the moment.

Last fiddled with by kracker on 2012-10-26 at 18:30
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Old 2012-10-26, 18:33   #3
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If you're looking at a large number of CPUs doing LL, Intel is probably the best price/performance out there. You can use this to compare them. I'd say you'll probably find that the i5-3550K (as kracker mentioned) or i7-3770K will be best, or perhaps a Sandy Bridge if you can find one for cheap. Be sure to invest in at least DDR3-1600 memory though, the processors are so fast now that memory bottlenecking is a real problem.
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Old 2012-10-26, 19:06   #4
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One minor point. i5-3550, or i5-3570k. there is no i5-3550k :)

the 3570k is a little faster for the same power use even if you don't overclock (overclocking is faster per iteration, but require more energy and more cooling which is more energy...and to be honest I didn't get the increase that I saw with the i7-2600 that I paid $100 more for and which uses more energy to boot.)

If you live near a microcenter they perpetually have the i5-3570k on sale for $189 (limit one per household) and $50 off an assortment of compatible motherboards--this deal is in-store only because people like me can't walk in without spending a great deal of money.

also I agree with Dubslow, a few extra dollars spent on faster memory is a better investment than almost any other once you've hit the Tock-generation sandy bridge, or any of the ivy-bridge chips.
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Old 2012-10-26, 19:16   #5
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Quote:
Originally Posted by chappy View Post
One minor point. i5-3550, or i5-3570k. there is no i5-3550k :)

the 3570k is a little faster for the same power use even if you don't overclock (overclocking is faster per iteration, but require more energy and more cooling which is more energy...and to be honest I didn't get the increase that I saw with the i7-2600 that I paid $100 more for and which uses more energy to boot.)

If you live near a microcenter they perpetually have the i5-3570k on sale for $189 (limit one per household) and $50 off an assortment of compatible motherboards--this deal is in-store only because people like me can't walk in without spending a great deal of money.

also I agree with Dubslow, a few extra dollars spent on faster memory is a better investment than almost any other once you've hit the Tock-generation sandy bridge, or any of the ivy-bridge chips.
Bad me. I ment the 3570k
And yeah, microcenter has good prices often
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Old 2012-10-27, 00:34   #6
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From ZERO to HERO... My current batch of LL farm workers have finally started submitting some results... moved up 571 spots on the big board today!

RANK
695 ig 2726.853 | http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif571 | 2.7 89.7 7.6

Crazy but Prime 95 crushed one of the workstations that it was grinding away on and it blew apart... only took 28 days to cause the hardware failure. The memory in this PC died and had to be replaced.

I was running Prime 95 to burn in the hardware and quite the job it has done.
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Old 2012-10-27, 00:52   #7
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Quote:
Originally Posted by ig1 View Post
From ZERO to HERO... My current batch of LL farm workers have finally started submitting some results... moved up 571 spots on the big board today!

RANK
695 ig 2726.853 | http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif*** http://mersenne.org/images/up_arrow.gif571 | 2.7 89.7 7.6

Crazy but Prime 95 crushed one of the workstations that it was grinding away on and it blew apart... only took 28 days to cause the hardware failure. The memory in this PC died and had to be replaced.

I was running Prime 95 to burn in the hardware and quite the job it has done.
Just curious... what does your farm consist of?

P.S.: You're welcome to use gpu72, it's not just for gpu
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Old 2012-10-27, 14:59   #8
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Quote:
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Just curious... what does your farm consist of?

P.S.: You're welcome to use gpu72, it's not just for gpu
I have some Dell Optiplex 9010 i7-3770 I am burning in. And an assortment of older CPU's I had laying around collecting dust. And a few PC's I built just to play with to see what kind of speeds I can get.

My two fastest workers to date have been overclocked units I assembled:

An i7-3820 on a x79 motherboard with 1333 MHz quad channel memory that I have been tweaking the configuration in an attempt to get faster LL iteration times.

An i5-3570K on a z77 motherboard with 2133 MHz dual channel memory that I have been tweaking the configuration in an attempt to get faster LL iteration times.

Both of the fast test machines were purchased at MicroCenter's crazy CPU motherboard combo deals as suggested earlier.
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Old 2012-10-27, 18:53   #9
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The 3820 would likely benefit from faster memory. It could be a real prime95 beast with quad channel but you are crippling it.
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Old 2012-10-28, 02:05   #10
ig1
 
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Quote:
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The 3820 would likely benefit from faster memory. It could be a real prime95 beast with quad channel but you are crippling it.
Suprisingly my testing with Quad channel configurations of 1333 MHz, 1600 MHz and 2133 MHz memory in this system showed minor difference's between them. My data shows gains that are barely measureable.

I suspect that the QUAD channel memory controller makes it so there is plenty of memory bandwidth to feed the 4 cores in the i7-3820.

I suspect that I am CPU bound and not memory bandwidth bound. Maybe Quad channel memory can't feed a six core i7-3930K or i7-3960K

I would definitely think that an 8 core Ivy Extreme will make your statement correct when they come out next year.
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Old 2012-10-28, 03:12   #11
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Quote:
Originally Posted by ig1 View Post
I would definitely think that an 8 core Ivy Extreme will make your statement correct when they come out next year.

That borders on NSFW pornography--I'll be in my bunk...
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