RT2.20 multi-GPU support major RED FLAG

[Andy9999]

Hi Folks,

using RT with 2 Cards (in my case 8800GTX) and SLI DISABLED, never been working reliably. I tried it from time to time. Currently I use driver 175.19 but I tried 180.48 as well without any success. I need 175.19 because of BF2142 compatibility.

What I would like to do, is underclock my cards and clock them at default when playing. In SLI enabled mode, it works well by overclocking the first card, which will automatically set the clock speed of the second card.

However, with SLI disabled, the second card DOES NOT TAKE OVER THE FIRST CARDS CLOCK SPEED! I read this a few times in a few threads here and this is just plainly wrong. You can see the real clock speed with GPUZ for example.

The behaviour I am observing is, that right after installing RT 2.20 i can control both cards clock and memory speeds. After a reboot, the second card cannot be controlled anymore and will fallback to 198Mhz.

If you then click on the settings of the second card within RT you can try to enable hardware driver overclocking. I tried this with seperate 2D/3D and without seperate 2D/3D settings which will both lead to a reboot. After rebooting the second card is still uncontrolable. I could get it working a few times if disabling the display that is connected to the second card and subsequently enabling it again. This probably resets something somewhere, but it does not work all the time.

Anyone got any solution for this? I tried ATITool 0.27 ß4 and it can overclock both cards in Non-SLI mode but it cannot be used to under- and overclock both cards by something like a rule as you should be able to do with RT.

And please don't hit me like that other guy who sufferd from the same problem until he turned on SLI. I need both SLI and Non-SLI cause I have 2 displays and a TV connected. Turning on SLI won't help me as this kills all the displays except the primary one.

Greetz / Andy