GFLOPSPost Date: 2010-04-06 |
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AndydViking 
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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 Topic: GFLOPSPosted: 06 Apr 2010 at 4:17am |
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Why am I getting higher gflops with hyperthreading off?
These are the same overclock just one has HT on and the other HT off. I also have snapshots off linx 100 passes showing the same thing.
I found this discussion but no realy answer on why exactly. http://forums.guru3d.com/showthread.php?t=304846 Edited by AndydViking - 06 Apr 2010 at 4:58am |
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 Apr 2010 at 8:37am |
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Intel Burn test seems to not be a very good indicator of Gflops. It will vari a lot. And also some apps love hyperthreading, others don't lol When benchmarking it is sometimes nigtht and day difference in scores turning HT off, or having HT on.. Just matters the program. |
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 Apr 2010 at 1:01pm |
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Justin this is was actually LinX I did the tests with. Is that the same as well; bad at gflop indication? So I know you have said that with windows 7 you would always enable HT However all I ever do I game and surf the web. Is HT still useful or would gaming alone benefit from HT off? The couple sites I saw seemed to indicate most games HT can hurt or doesn't matter.And lol this could be tottally psychosomatic but games (COD series) seem to be smoother to me w/ HT off.
So for me should I still enable HT?
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 Apr 2010 at 1:17pm |
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Linx is a program that uses the Intel Burn test registries, algorithms, so same thing basically. HT on with windows 7, no question about it.
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 Apr 2010 at 1:36pm |
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ok thanks Justin. I'll turn it back on.
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 08 Apr 2010 at 11:01pm |
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I don't know if this is interesting to anyone or not but I have done more testing with HT on/off and when I ran cinebench it was indeed very much faster with hyperthreading on which was to be expected I guess.
Also, although I was still well within intel spec I found I could drop my vcore on both HT on and off I am now at 1.13750 vcore with 166 bus and 21 multi. Think I can try dropping it further?
EDIT: an article saying basically what Justin told me http://www.hpcwire.com/blogs/Benchmark-Challenge-Nehalem-Versus-Istanbul-48551797.html
I wonder if in my case since linx doesn't support hyperthreading then my 1333 memory might be further bottlenecking it? Edited by AndydViking - 08 Apr 2010 at 11:48pm |
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 May 2010 at 5:26pm |
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Is their a good method to calculate what you should be getting in gflops with linx?
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 May 2010 at 5:34pm |
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not really, too many variables, when you hit over 100 Gflops, then you are doing decent.
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 May 2010 at 5:37pm |
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Well with 6 gigs of 1333 ram and my i7 920 at 3.477 oc I am getting 44. Is that an OK score?
EDIT: Sorry looks like I can answer my own question. According to
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I am right on par. Edited by AndydViking - 06 May 2010 at 5:54pm |
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 May 2010 at 5:55pm |
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Linx does not report Gflops very accurately.
sandra does a better job, maybe not the best lol
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 May 2010 at 5:58pm |
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So your saying to not compare linx scores with other people because it fluctuates that much? I will try the link you sent as well.
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 May 2010 at 6:23pm |
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exactly. Linx is not a benchmark so to speak
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 May 2010 at 7:08pm |
 thought I would give Sandra a try, ran the benchmark..
with my new RAM settings, and ...
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 May 2010 at 7:11pm |
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lol awesome. and you were just saying you prolly won't get any world rec ords w/ that rig lol.
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justin.kerr
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Joined: 06 May 2008 Online Status: Offline Posts: 5084 |
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Posted: 06 May 2010 at 8:10pm |
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we atleast I took first place for single CPU, and the guy who beat was running 4 CPU's.
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AndydViking
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Joined: 10 Sep 2009 Online Status: Offline Posts: 733 |
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Posted: 06 May 2010 at 8:24pm |
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Yeah lol pretty sweet.
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rholyrag
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Joined: 17 Oct 2009 Online Status: Offline Posts: 841 |
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Posted: 07 May 2010 at 6:17am |
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Very Nice!
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"What we do in life echoes in eternity" - Maximus from Gladiator
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