8600GT (far) slower then 6800GT and 7600GT?

[gilboa]

Hello all,

My main workstation (Dual Opteorn, 6800GT) died (or actually, got flooded to death) and is being temporarily replaced by an Athlon64X2/5000 combined with a 8600GT/512MB.

However, I'm getting semi-abysmal performance out of my 8600GT. (Even when I OC it to 450Mhz/600Mhz. (Up from 400Mhz/575Mhz).
While I could play UT2K4 at 1920x1200x4XFSAA on my aging 6800GT, UT2K4 is only playable at 1920x1200xNO FSAA on my 8600GT.
Same goes for Q4 and ETQW.

Far worse, I get much better performance out of my 70$ 7600GT/AGP that runs on my aging Sempron64/2800 machine.

Can anyone confirm these findings?

Michael,
Have you ever benchmarked the 7600GT vs. the 8600GT using the 1xx drivers?

- Gilboa

[Kano]

You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.

[gilboa]

You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.

Sounds reasonable enough. (This card is just a stop-gate until I buy a new machine with a 8800XX on it.)
However, why am I getting (far) better performance out of the 7600GT? I know that the 8600GT didn't outperform the 7600GT... but I'm seeing ~20% drop in performance.

Am I the only one?

- Gilboa

[Kano]

Do you use 169.x or 100.x driver series?

[gilboa]

Tried them both.

- Gilboa