SLI and what am I doing wrong???

S

Soffball

n00b
Joined
Feb 22, 2006
Messages
7
First off...system specs
A8N SLI M/B
AMD 4000 san diego
2gb Corsair RAM
2 EVGA 7800 GT's

I just installed my second 7800 GT to make my system SLI. Its an EVGA clocked at 470mhz and 1.1 mem. My first 7800 GT was (is?) clocked at 445 mhz. Coolbits shows the clockspeed at 470 now. Anyway....in a number of games with settings at max I see either no improvement in fps or a drop in fps when running in SLI mode. A few examples....Half Life 2...no SLI 155 fps/SLI 145 fps GT Legends...no SLI 34 fps/SLI 27fps. Far Cry..no change in fps. rFactor..no change. NR2003..no change
i have enabled the SLI rendering mode in the performance and settings box. I know SLI is working because I get a major boost in 3DMark 03, 05, 06 scores. The only games that Ive seen a boost in is Flat Out and Half Life Lost Coast. Its getting really frustrating and Im considering just selling my 2nd card. Is there anything Im missing here? Am I not doing something I need to do? Thanks for any guidance.

Aaron
 
Did you remember to flip the SLI card to dual cards instead of single, and did you connect the SLI bridge?....
 
Yes. Did both of them steps. I get the "your system is SLI capable" or enabled or whatever it says. Oh..im running the 81.98 drivers.
 
are you using the game profiles on the performance and quality page? try that. i dont know what os you are using but i switched to mce2005 recently and that thing happened to me, and even 3d01 scores went down. i had to switch to the mce drivers. this is probably not your prob, but it sure sounds like a driver issue.
 
Soffball said:
Yes. Im using the profiles and still no difference. What is mce2005?
Click to expand...


Windows xp media center edition 2005 not really any different than xp pro except that it has extra stuff for video capture and stuff like that.
 
did you try switching the cards around? i have 2 evga 6800gs and was getting terrible or no performance boost whatsoever then i switched the cards around and the problem fixed itself :confused: . i dont' know why it worked but you might want to give it a try also check the bios versions on each card to make sure they match( i'm assuming you have matching models). did you uninstall the driver's before adding the second card? if not download driver cleaner pro at guru3d, uninstall nvidia diplay drivers then reboot into safe mode, run driver cleaner pro to get rid of the rest of the drivers, reboot then reinstall the most recent drivers with both cards.
 
wait... scratch what I said.. I need to fully read the OP.. *doink*.

Sounds like maybe your SLI profiles are not working right.. maybe for grins, clean the drivers out with a driver cleaner and then re-install the 82.12s... (I found the 81.98s to be fussy with some D3D apps). Also - make sure you don't have Nhancer running - and if you do, remove it.. it can override SLI profiles settings.. start fresh, verify things work, then install nhancer later if you want to manipulate the SLI profiles more easily. good luck!!
 
make sure the drivers loaded for BOTH cards in the device manager. I had the same problem when I added the second card. I had to manually add the drivers to the second card.

Plug in the display to the "master" card only.

There used to be a problem with bios versions of different card batches. This was about 6 months ago. You should check the bios versions of both cards and then if things still dont seem right, call eVGA support and talk to them about this. See what they say. They are very helpful.
 
^^ ayup.

fyi - if you clean and reload the drivers with both cards in and SLI enabled on the mobo, the true nvidia drivers for both should load for both cards.. If you add the new card and don't reload anything, windows sometimes loads it's default video driver for the second card.. which will not fly in SLI..
 
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