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

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June 28, 2008 3:26:12 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)
June 28, 2008 3:40:12 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.
June 28, 2008 4:40:48 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
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June 28, 2008 6:19:35 AM

I did a fresh instal of windows etc...
SLI is now dropped at 13fps.... no SLI is still 27-28fps
June 28, 2008 6:27:40 AM

Your CPU is bottlenecking it. with sli, bottleneck becomes bigger because cpu has to feed 2 cards data. get an e8400 or better.
June 28, 2008 6:41:43 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....... :-/
June 28, 2008 6:51:12 AM

abracadaben said:
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!
June 28, 2008 6:59:16 AM

+1 for cpu bottleneck.
June 28, 2008 8:40:28 AM

lol. I think Im gonna stick with one 8800GT, get the money back on the second... and Ill wait later to upgrade.
June 28, 2008 12:54:00 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.
June 28, 2008 2:44:48 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~
June 28, 2008 2:50:12 PM

6000+? Well do they have 6000+ in s939 socket?
June 28, 2008 6:38:21 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
June 28, 2008 6:50:35 PM

got mistaken. I thought the first was a X2
June 28, 2008 10:03:52 PM

Then I have a question, should I get the money back to use it and change my CPU to a X2 or opteron? or should I change CPU and keep the SLI? I mean, will it be worth it?
June 28, 2008 10:26:31 PM

mm interesting, I upgraded to latest drivers 175.19 (I was .16) and my SLI got bumped from 18fps to 22 fps... but still less than no SLI...
June 28, 2008 10:46:35 PM

BTW I tried with my old SLI 7950GT KO.... I got 17fps in SLI..... and less without SLI...

which makes me think that's not so funny to buy a 8800GT SLI to get same perf as a 7950GT SLI lol..........


June 28, 2008 10:50:58 PM

yea, well the problem is this abracadaben as others said, apparently your platform (cpu+motherboard+ram) is holding back your graphics cards

As I said I don't really know enough about s939 to give you a full assessment, but i'm assuming that this is a 3-4 year old platform? In which case you might need to do an upgrade to really get the most out of it.

To put it in perspective abra, I use 8800 GT SLI on a Nvidia 750I EVGA board with 4gb ddr2-800 with an e8400 core2duo processor

I have my cpu overclocked to 4050mhz, ram is at stock speed, and video cards are overclocked to 700 mhz gpu, 1750mhz shader and 1000mhz memory

If I run the Crysis gpu benchmark, in "high spec" 0xantialiasing, 16x anisotropic filtering, at 1680*1050 resolution; I get min 21 fps, max 63 fps and average fps 45.21

So you can see I guess that with what you are running right now, your 8800 GTs have a lot more potential at least in Crysis if you can afford a platform upgrade
June 28, 2008 11:48:46 PM

Bottleneck for the loss.
The fastest CPU made for 939 was the Athlon 64 4800 X2.
June 29, 2008 4:51:26 AM

ok, lets say I can get the opteron 185. That should bring a bit more guts in my config. I should get better perfs with a single 8800GT, but is it still worth it to keep the second one? or should I stick with one 8800GT only?
June 29, 2008 6:03:46 AM

doomsdaydave11 said:
Bottleneck for the loss.
The fastest CPU made for 939 was the Athlon 64 4800 X2.

The fastest would be the FX-60 (or opteron 185), 2.6GHz like a dual core version of the FX-55. X2 4800+ is pretty close though just 200MHz less and the dual core equivalent of his A64 4000+.

+1 on the CPU, a single core with SLI 8800GT is a waste.

With the opty 185 you'd be fine with single or dual 8800GT. Depends on your resolution as to how big a playable difference you would see. The higher the resolution and fsaa you use the more the load shifts to the GPU(s). Crysis is one game that can hammer a single G92, so for that game I would say keep the second GT. You often won't get the full potential out of SLI 8800GT with that CPU, but it wouldn't be a total waste either for high res or cranking fsaa. If money is an issue, return the second 8800GT and put the money toward a dual core CPU, either for your mobo or a cheaper AM2 mobo/Athlon X2/DDR 2 combo.
a c 168 Î Nvidia
June 29, 2008 7:21:18 AM

pauldh said:
The fastest would be the FX-60 (or opteron 185), 2.6GHz like a dual core version of the FX-55. X2 4800+ is pretty close though just 200MHz less and the dual core equivalent of his A64 4000+.

+1 on the CPU, a single core with SLI 8800GT is a waste.

With the opty 185 you'd be fine with single or dual 8800GT. Depends on your resolution as to how big a playable difference you would see. The higher the resolution and fsaa you use the more the load shifts to the GPU(s). Crysis is one game that can hammer a single G92, so for that game I would say keep the second GT. You often won't get the full potential out of SLI 8800GT with that CPU, but it wouldn't be a total waste either for high res or cranking fsaa. If money is an issue, return the second 8800GT and put the money toward a dual core CPU, either for your mobo or a cheaper AM2 mobo/Athlon X2/DDR 2 combo.

[:mousemonkey:2] I would be more inclined to keep the second GT and start saving for a new mobo, CPU and RAM, as a former 939 user I know the OP's pain as I had to replace a 3800 x2 with an E8400 + 680i to get anywhere near the full potential of my 8800GT's.
June 29, 2008 7:37:48 AM

Mousemonkey said:
[:mousemonkey:2] I would be more inclined to keep the second GT and start saving for a new mobo, CPU and RAM, as a former 939 user I know the OP's pain as I had to replace a 3800 x2 with an E8400 + 680i to get anywhere near the full potential of my 8800GT's.


Thanks buddy. That is what I was looking for. Honestly, I play in 720p on my 50" plasma.... And it looks fine to me. I know 1080p would be better but I cant change everything every year lol.

Anyway, Im not a hardcore gamer anymore and my prefered games are still Quake2&3 (I still prefer Q2.... They understood in that time that reloading a gun was just a waste of time lol).

All the games I have run fine, only Crysis is slow, but its a great game really (reminds me when unreal 1 came out). So Im going to return the second 8800GT, get a CPU (if I can find one) and I should run fine I guess.

I didnt really find any good article regarding minimum/average/optimal conf to optimize your money spending lol

Last question:

I see that the 8800GT is murdering my SLI 7950GT. I mean those geforce 7 are really the best I could find before the 8800s came out And I am really surprised how a single 8800GT can double kill my SLI. Even with my slow processor.

So.... Would I get better perf with a GTX??? or a 9800GT??? single...

I may test one just for fun (thanks to Frys with the 15 days return policy).

BTW Im French, just came here in LA since 1 year. That is funny to me... In France when you buy anything you have to make sure it is what you want... They would never change anything... even clothes is a pain in the butt...
LOL

Thanks guys
a c 168 Î Nvidia
June 29, 2008 7:43:20 AM

You're welcome mate, I hope it works out for you. :) 
June 29, 2008 8:35:39 AM

I hope so... do you know the market price of an opteron 185???? Looks like Im not the only one on ebay to look for it... only one available
a c 168 Î Nvidia
June 29, 2008 9:10:25 AM

Sorry mate I don't, I stopped caring about AMD CPU's about 30 seconds after reading a report of the 939 being killed off a year or so earlier than originally promised.
June 30, 2008 6:53:12 PM

ok, Im going to receive an opteron 185. which I think is the best stuff I can get in 939 and still cheaper than buying new Mobo+CPU+RAM...
so we'll see how it works.
I will be able to compare if it is worth to keep the SLI or not.......
a c 168 Î Nvidia
June 30, 2008 7:37:28 PM

abracadaben said:
ok, Im going to receive an opteron 185. which I think is the best stuff I can get in 939 and still cheaper than buying new Mobo+CPU+RAM...
so we'll see how it works.
I will be able to compare if it is worth to keep the SLI or not.......

Well I think SLI is worth the effort, at these settings I get this result from the GPU benchie , and it looks like this .
June 30, 2008 11:53:34 PM

mmm nice. But I want to see if upgrading my CPU to the opteron will show the same behavior.
On a single GT8800 I should get better than 27fps (which is my current perf in 720p high settings AA2x)

But my current situation is when I enable SLI, my perf drop to 18fps!!!
So I want to see if I upgrade my CPU to the opteron 185 (dual core 2,6Ghz) I will have same thing... If Im getting 35fps on single 8800GT and 25fps on SLI, that will not be interesting for me to keep the second GT.

Hopefully the CPU will kick enough to provide more perf with SLI than without....

few days... I'll let you know.

From what I read the opteron 185 looks like a good option (for me...).
June 30, 2008 11:56:41 PM

BTW what is the small soft you use to monitor your system?
and... where did you get that reloaded version of Bioshock without Icon? ;-)
July 3, 2008 3:44:34 AM

ok guys,
I upgraded my Athlon 64 4000+ to an Opteron 185 (dualcore 2x 2.6Ghz)
here are the GPU perf I get in crysis (average fps)

results with Athlon 64:
single 8800GT=27fps
SLI 8800GT=18fps

results with Opteron 185:
single 8800GT=38fps
SLI 8800GT=28fps

So I really dont understand why the SLI is always behind.
I got the 175.19 drivers, I patched Crysis...........................

Why the hell is it slower in SLI????????????????
July 3, 2008 4:18:29 AM

pauldh said:
The fastest would be the FX-60 (or opteron 185), 2.6GHz like a dual core version of the FX-55. X2 4800+ is pretty close though just 200MHz less and the dual core equivalent of his A64 4000+.

+1 on the CPU, a single core with SLI 8800GT is a waste.

With the opty 185 you'd be fine with single or dual 8800GT. Depends on your resolution as to how big a playable difference you would see. The higher the resolution and fsaa you use the more the load shifts to the GPU(s). Crysis is one game that can hammer a single G92, so for that game I would say keep the second GT. You often won't get the full potential out of SLI 8800GT with that CPU, but it wouldn't be a total waste either for high res or cranking fsaa. If money is an issue, return the second 8800GT and put the money toward a dual core CPU, either for your mobo or a cheaper AM2 mobo/Athlon X2/DDR 2 combo.


My bad, meant to say the fastest X2 was the 4800. I kinda automatically ruled out the FX-60 because it would be essentially impossible to find. Thanks for the correction :) .
July 3, 2008 5:23:04 AM

anyway, now with my dual core, I still have the pb that the SLI is slower.
mmmm after thinking about it I know that I use the same sli bridge that the 7950GT I had.
is that a pb?
July 3, 2008 6:07:18 AM

shouldn't be. Using the 2nd 8800GT in PCIE_0 (or _1 or whatever) and see if you get the same FPS, one of the units could be defective.

Sorry, i really don't know much about SLI.
July 3, 2008 6:19:18 AM

no same cards....
a c 168 Î Nvidia
July 3, 2008 6:55:37 PM

abracadaben said:
BTW what is the small soft you use to monitor your system?
and... where did you get that reloaded version of Bioshock without Icon? ;-)

Rivatuners 'Hardware Monitoring' is what you can see as for the 'reloaded version of Bioshock without Icon' I have no idea what you mean :whistle: 
July 3, 2008 8:47:07 PM

lol.

I've been checking the SLI monitor. actually both of the cards are used. But very low. unless I kick some 16xAA etc...

So then my SLI is used much more but I still stick to 27fps when Im at 39fps with one 8800GT (which drops down to 26 when all AA on)

anyway. It sounds like either the CPU is not enough for SLI :-/ or the game is not really optimized....

What could I bench with (3dmark gives me a better score in graphics in SLI... so it might be only Crysis)
July 4, 2008 1:27:22 AM

System:
Mobo: M2N32 SLi Deluxe
RAM: 2x2GB TWINXMS2 Corsair
VGAs: eVGA GeForce 8800GT 512MB x2

CPU: Athlon 4800+ x2 @3GHz
CPU: Phenom 9750 x4 @2,7Ghz

Test: Crysis @ 1680x1050 High Setting
Phenom: 25-60FPS, Ave: 48 FPS
Athlon x2: 15-45FPS, Ave: 31 FPS
CoH @ 1680x1050 DX10 Maxed setting
Phenom: 5-150FPS, Ave: 55FPS
Ahtlon x2: 3-65FPS, Ave: 33FPS
Lost Planet @ 1680x1050 DX10, maxed out, no AA.
Phenom: 65-80FPS, Ave: 72FPS
Ahtlon x2: 24-50FPS, Ave: 42FPS.

An Opteron won't be enough for your SLI 8800GT.

I suggest new upgrades of mobo and cpu, and go at least with Athlon 6400+ x2, or E8400.

And SLI works better with high res, like 1680x1050/1680x1200 +

1 more thing, the Phenom bumped my 3dmark 2006 score from 10k->14k.
August 14, 2008 10:37:42 AM

does a quad make sli run smoother... one core each for the two cards and the other two cores for cpu work ingame?
!