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Sandy Bridge and stress testing

Post Date: 2011-01-18
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Topic: Sandy Bridge and stress testing
    Posted: 18 Jan 2011 at 6:29pm
Just a heads up for all you people wanting to overclock Sandy Bridge, also Digital Storm may all ready be aware of this.
 Linx or Intel burn test will not stress Sandy Bridge, unless you use Windows SP1.  Linx should produce 120-140 G-flops with Sandy Bridge overclocked. Without SP1 windows will not stress Sandy bridge enough, but with SP1 it will need more voltage to run stable.


Edited by justin.kerr - 18 Jan 2011 at 6:33pm
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Posts: 36758 		  Quote DST4ME Quote  Post ReplyReply bullet Posted: 18 Jan 2011 at 9:05pm
Thx for that info justin

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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 8:00am
finally got my hands on SP1 final, did a quick test, need to do more, but F'ning amazing.  lol.
 
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Posts: 16314 		  Quote Alex Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 1:02pm
Wow nice! I'll have to update to SP1 and try it myself.

Have you tried Prime95 on Blend? That's the real kicker for Sandy Bridge...
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tech007 View Drop Down
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Posts: 46 		  Quote tech007 Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 1:22pm
Justin.Kerr what cooling did you use for that test?

Edited by tech007 - 19 Jan 2011 at 1:22pm
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 2:12pm
Originally posted by tech007

Justin.Kerr what cooling did you use for that test?
it is my test bench water setup, kinda a mess now, too many different setups on it, so I have to re-do it, just been putting it off, I have poor flow the way it is cobbled together right now. lol
 
Alex, only tried Linx, but what did pass 20 passes of Linx, exact same settings neded about 4 clicks more voltage to be stable for just 3 passes on SP1, just to let you know 
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Posts: 16314 		  Quote Alex Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 2:53pm
Thanks for the heads up!
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Posts: 62 		  Quote Metamorphosis Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 4:37pm
Prime95 is acting really weird with SandyBridge atm.. if you disable hyperthreading it runs stable, but with hyperthreading on its alot harder to get even 20mins on Prime95.

And Vantage showing lower GPU scores with hyperthreading on then off is also concerning since Vantage as far as I can remember has always favored hyperthreading. Hopefully some patches will resolve the issues.


Edited by Metamorphosis - 19 Jan 2011 at 4:38pm
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 19 Jan 2011 at 8:37pm
Wow, that is a load BS, more like a train load.. lol
 
the reason people would be having trouble with HT on, is because it puts more stress on the CPU, and needs more voltage, same with all HT Intel processors. this has been a common fact known for many years. lol  Mine runs Prime95 stable for hours at 5,100Ghz with HT on.
and 3dmark Vantage is averaging around 30% better CPU scores with HT on VS HT off..  Just looked at my testing, and the top 30 world records in 3Dmark Vantage with 2600K, all used HT.  GPU score is just that, dependent on GPU, CPU score is just that, CPU dependent, unless you are a total noob,and have the GPU do the CPU calc.. lol it happens.LOL
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Posts: 62 		  Quote Metamorphosis Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 1:05am
Wow man.. just completely dismiss it hey? Did you actually look? And I'm not talking about CPU score I was talking about GPU score.

HT on



HT off


More anomalies with the GPU and hyperthreading.. you must have one heck of a golden egg to be the only person not experiencing this.
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Posts: 2247 		  Quote Dragoonseal Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 3:57am
Wait, so you got a 0.88% difference in score on the second run and didn't think that maybe, just maybe, that kind of falls within the margin of random variance territory?

Oh that perhaps Vantage isn't the most reliable benchmark in the world?
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Posts: 841 		  Quote rholyrag Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 5:31am
Wow, 141GFlops, and four passes finished in a little over four minutes, very cool.  Isn't your 980X only running at 100GFlops?
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Metamorphosis View Drop Down
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Posts: 62 		  Quote Metamorphosis Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 6:20am
Actually Dargoonseal I brought it up in another thread.. won't get into it too deep, but of the reviews I can find that shows minimum framerate the 2600k loses out to the 2500k in some game benchmarks. I'm assuming its related to hyperthreading. Though like I said in it .. more testing is needed. I brought it up here because I thought it was worth mentioning since it was about SandyBridge and some quirks its exhibiting.

If you want to ignore it then go for it. I was hoping to get some verification from the community by hopefully getting a larger sample.. not to be completely dismissed and called BS.
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 9:10am

I will look into it more, but I tried 3 different GPUs, HT on/HT off  differences were within the variance that 3Dmark Vantage will have between runs.

Then I looked at several different GPU's, with the same clock/RAM speed, but using a wide array of CPU's on HWbot, and no dice same scores within tolerance
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 9:43am
Originally posted by rholyrag

Wow, 141GFlops, and four passes finished in a little over four minutes, very cool.  Isn't your 980X only running at 100GFlops?
yep, 100 out of 980x, so for AVX apps, SB will really kick butt, and also makes me pretty hopeful on the next socket, should be a real beast!
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Posts: 2247 		  Quote Dragoonseal Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 11:13am
Come to think of it, have you tried the 980X with SP1 yet? Smile
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 11:22am

looky here young man.

 

http://software.intel.com/en-us/avx/
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 20 Jan 2011 at 4:54pm
Metamorphisis, , if you look up a couple post you will see a blurp about the ultra noobs, using the GPU to calc the CPU portion of 3Dmark Vantage.. LOL
Thanks for posting up a couple screenshots of someone like that, I did not know there were even people left that would do that. Im%20with%20Stupid
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Posts: 62 		  Quote Metamorphosis Quote  Post ReplyReply bullet Posted: 21 Jan 2011 at 12:06am
... so his CPU is 30degrees higher doing what exactly then?

and there's no reason to call yourself stupid LOL

Are you talking about having Physx running? Hes got screenshots up with that disabled too. Otherwise I have no idea what your talking about I've never seen a run CPU tests on GPU as an option.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 21 Jan 2011 at 9:05am
30C higher will lower life a ton, like I just stated above. and depending on a massive amount of variables, effect stability.
 
Running with PPU on will use the GPU to perform the CPU test. I can explain more if needed.
 
Vantage between runs will have a variance higher than what he posted the difference between the two screenshots.. so zero meaning there.
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Posts: 2312 		  Quote ablahblah Quote  Post ReplyReply bullet Posted: 21 Jan 2011 at 2:19pm
You know, with what the mainstream SB is bringing to the market, I'm starting to wonder what the heck Intel packed into the high-end line this year Drooling
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