SLi 8800GT vs. SLi 7800GT

[Smitty090]

I just swapped out my girlfriends 2 7800GT cards and put in 2 8800GT cards. I updated the drivers from the NVidia site.

Ran a simple benchmark (Aquamark3) and was getting 125,000 with the 2 7800GT's and now with the new 8800GT's I am getting 99,000...

I find it EXTREMELY odd to drop 20% in performance with such a drastically higher card put in!!!

Thoughts?
Thanks!
Smitty

 

[Drizzt]

enabled sli...? just checking.

 

[Smitty090]

Yuppers.

 

[Drizzt]

idk, try 3dmark06 just to make sure its not the program maybe.

 

[Smitty090]

just ran it 5 minutes prior to upgrading cards. I copied the program folder to my comp and got just over 200,000... gotta be something in her set up.

Reinstalling DirectX now but not confident that will make a difference.. nope.. no difference.

Going to try non SLI since I was getting 99,000 with single 7800GT.

 

[Drizzt]

are they the same brand and default clock speed 8800 gt's?

 

[Smitty090]

yeah just purchased them together.. same identical cards, all stock.
I removed one and ended up with 100,000 score with a 99,000 score in SLi...

Tried plugging a separate power supply into the cards to ensure they are getting enough power and no difference..

maybe my mobo/chip/ram combo in that maching just plain old cant do any better even with maxed out graphics... it's am X2 3800+ with 2GB DDR400 RAM on a Lanparty SLi-DR board.. you would still think 8800s would out perform the 7800s though.. no matter if the rest is maxed..

Gonna take out mine and put the 2 of them in my machine to see what happens to test the cards in case one is a dud or something.

Thanks for the second set of eyes! I'll post some results after. (Thank god I havent water cooled my VGA card yet) ha ha..

 

[AP4LIFETN]

the cpu probably holds it back, as well as the x8 slots in SLI, these newer cards in SLI seem to perform best with full bandwidth

 

[aspire]

Even an 8800gt wont saturate an 8x pci-e channel.

 

[Drizzt]

yeah just purchased them together.. same identical cards, all stock.
I removed one and ended up with 100,000 score with a 99,000 score in SLi...

Tried plugging a separate power supply into the cards to ensure they are getting enough power and no difference..

maybe my mobo/chip/ram combo in that maching just plain old cant do any better even with maxed out graphics... it's am X2 3800+ with 2GB DDR400 RAM on a Lanparty SLi-DR board.. you would still think 8800s would out perform the 7800s though.. no matter if the rest is maxed..

Gonna take out mine and put the 2 of them in my machine to see what happens to test the cards in case one is a dud or something.

Thanks for the second set of eyes! I'll post some results after. (Thank god I havent water cooled my VGA card yet) ha ha..

I have no idea why those 8800's are performing like that... even if the board is older it should at least perform the same.