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Old 2012-10-23, 10:35   #1
fivemack
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Default Motherboard for AMD FX8350

What would a reasonable integrated-graphics motherboard for this chip be?

(on a different note, has anyone got gnfs-lasieve4I15e performance figures for the 8150? I can't see anyone with an 8150 in the stats at http://www.allprojectstats.com/top.p...jekt=91&type=0)

Yes, I know it will not offer good prime95 performance, but eight fast cores with 2MB L2 per pair seems not unreasonable for sieving (although the L1D cache is as far as I can tell down to 16kb, which is not great)
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Old 2012-10-23, 10:44   #2
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8150 here (http://escatter11.fullerton.edu/nfs/...p?hostid=27544) but my old core i5 clearly beats it when I running gnfs-lasieve4I14e siever.

Last fiddled with by pinhodecarlos on 2012-10-23 at 11:13
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Old 2012-10-23, 10:54   #3
fivemack
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OK, scratch that idea
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Old 2012-10-23, 10:59   #4
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Quote:
Originally Posted by fivemack View Post
OK, scratch that idea
If you want I can try to run a few 14e wu's so that you can compare to Lionel's 8150 machine. If you go here (http://escatter11.fullerton.edu/nfs/top_hosts.php) you will see my quad-core machine (overclocked to 3.4 GHz) in TOP 20, it is the 28521 host.
I think the best option is i7-3770K, it is tremendous powerful when overclocked, I think it can easily double my machine output with less energy consumption.

Last fiddled with by pinhodecarlos on 2012-10-23 at 11:06
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Old 2012-10-23, 20:09   #5
Dubslow
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The thing though is that they aren't truly 8 cores; they're 8 integer processors with only 4 FP processors. 2I+1F is called a "module" in AMD terminology. It's really more of "4 cores + 4 half-cores", but they sell it as 8 anyways.

Edit: The Piledriver prices seem much better.

Here's a good description of the architecture.

Last fiddled with by Dubslow on 2012-10-23 at 20:26
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Old 2012-10-23, 20:56   #6
fivemack
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Yes, each pair of cores shares a single FP unit, but GNFS sieving doesn't use FP so for that particular task it shouldn't be a problem.

On the other hand the L1 caches on each core are small (16kb); whilst lasieve4 can be configured with various L1 cache sizes, I think the executables nfs@home use are configured for 32kb.

(I'm a little confused in that case as to why I get such good performance on hyperthreads on Sandy Bridge - my suspicion is that the small fast per-core L2 caches handle the L1 misses better than the big shared L2 on AMD processors)
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