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  Tom's Hardware UK and Ireland Forums » Graphic & Displays » Nvidia » SLI 8800GT slower than single GT in crysis :-/
 

SLI 8800GT slower than single GT in crysis :-/

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 Thread : SLI 8800GT slower than single GT in crysis :-/
 
abracadaben
Profile: stranger
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n°1834895
06-28-2008 at 05:26:12 AM

Hi guys,
I just bought 2 8800GT to replace my 7950GT KO SLI.

what a surprise. When I run the GPU test in crysis, I get 27fps (high settings) on a single GT.
when I enable SLI, I get 18fps!!!

Dude, I know my CPU is a slow one (AMD 64 4000+) but still......

I run the 1.1 patch and drivers 175.16 (BTW there was a .19 available yesterday and seems to be removed today?!)

any idea where could be the pb?

Note: I get better graphic score under 3dmark06 in sli. my PSU is a 700WATTS (no power pb)

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ovaltineplease
Rich and Chocolatey
Profile: nimble knuckle
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n°1834899
06-28-2008 at 05:40:12 AM

go into your Manage 3d Settings in the Nvidia control panel, and "Restore" your game profiles to Nvidia defaults if you haven't already.

You can try removing the drivers and reinstalling the cards, there are driver removal tools that can help ensure the software is completely gone, there could be old data still resident in the system from your 7950s.

Does your motherboard support at least dual pcie 8x lanes? Slow PCI-E lanes can bottleneck the video cards and be detrimental to performance. You didn't mention the motherboard, but I don't think its a CPU issue.


Message edited by ovaltineplease on 06-28-2008 at 05:41:59 AM
abracadaben
Profile: stranger
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n°1834919
06-28-2008 at 06:40:48 AM

Thanks for the quick response. Im going to give it a shot. That would make sense.

My motherboard is PCI-E 16x. Its a EVGA: 123-K8-NF47-AX
I know that I can't get the maximum of the GT with the CPU but I assume it should not drop the perf on SLI.

Im going to try to reset the profile and let you know.

thanks

abracadaben
Profile: stranger
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n°1834934
06-28-2008 at 08:19:35 AM

I did a fresh instal of windows etc...
SLI is now dropped at 13fps.... no SLI is still 27-28fps

abracadaben
Profile: stranger
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n°1834935
06-28-2008 at 08:21:11 AM

I don't get it

pcgamer12
LVL: ????
Profile: old hand
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n°1834936
06-28-2008 at 08:27:40 AM

Your CPU is bottlenecking it. with sli, bottleneck becomes bigger because cpu has to feed 2 cards data. get an e8400 or better.


Message edited by pcgamer12 on 06-28-2008 at 08:28:01 AM
abracadaben
Profile: stranger
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n°1834938
06-28-2008 at 08:41:43 AM

I think you are right..... I pushed the FSB from 200 to 220 to try.... I won 3-4 fps. so Im now at 31 instead of 27 with one GT and 22 instead of 18 with SLI.
Damn! my motherboard is a 939. can't find any CPU now... need to change all of that....... :-/

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doomturkey
Profile: addict
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n°1834942
06-28-2008 at 08:51:12 AM

abracadaben wrote :

I think you are right..... I pushed the FSB from 200 to 220 to try.... I won 3-4 fps. so Im now at 31 instead of 27 with one GT and 22 instead of 18 with SLI.
Damn! my motherboard is a 939. can't find any CPU now... need to change all of that....... :-/


S939 owners got royally screwed. I'm running a S939 3500+ AGP system and it lags way behind in every way. I have to upgrade everything now =(, still running an AGP card, DDR1, etc. Oh well, new build should be a lot of fun!

Shadowthor
Profile: nimble knuckle
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n°1834943
06-28-2008 at 08:59:16 AM

+1 for cpu bottleneck.

abracadaben
Profile: stranger
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n°1834960
06-28-2008 at 10:40:28 AM

lol. I think Im gonna stick with one 8800GT, get the money back on the second... and Ill wait later to upgrade.

ohiou_grad_06
Profile: nimble knuckle
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n°1835012
06-28-2008 at 02:54:00 PM

You could hunt ebay up man. Might be able to get like a used 3800x2 for socket 939 cheap, and maybe overclock it until you can pick up something better.

ovaltineplease
Rich and Chocolatey
Profile: nimble knuckle
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n°1835047
06-28-2008 at 04:44:48 PM

Will the s939 support the AMD Black edition x2 6000+?

I'd think that would give you enough CPU power, that'd be 3ghz I think

I don't really know enough about the s939 chip to know if that is the only problem though~

romulus47plus1
Ronald- Nazi in disguise.
Profile: old hand
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n°1835051
06-28-2008 at 04:50:12 PM

6000+? Well do they have 6000+ in s939 socket?


---------------
Why so serious?
abracadaben
Profile: stranger
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n°1835180
06-28-2008 at 08:38:21 PM

would that be cool?
AMD Athlon 64 3700+ San Diego 2.2GHz 1MB L2 s939 KABYE
or
maybe this
AMD Opteron 185 Denmark 2.6GHz 2 x 1MB L2 S939 110W DC

abracadaben
Profile: stranger
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n°1835187
06-28-2008 at 08:50:35 PM

got mistaken. I thought the first was a X2

abracadaben
Profile: stranger
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n°1835226