Hello, i need some help guys, i have read many things about the DXG/SLI for DFI NF4 ULTRA-D, so, i said why not? I bought a second graphics card XFX GeFORCE 6600GT, i ask a friend of mine for an SLI BRIDGE, and here we go. I want to say that i didn't mod the chipset, i uninstalled the latest drivers from nvidia ver. 93.71, I put both graphics cards in their dedicated slots, installed the drivers ver. 66.81, i put the sli bridge between them, enabled MULTI-GPU on NVIDIA DISPLAY and it works. Checked with everest : SLI STATUS - Supported , Enabled / SLI GPUs - 2 / SLI Connector - Present . I used ver 66.81 because the newest, after ver. 70.xx doesn't show the MULTI-GPU option in the NVIDIA DISPLAY menu. Overclocked with RIVA TUNER ( i am not an expert, i guess only one card was overclocked ), checked with 3DMark05, works fine, my first score with a single card was 4005, the second one, with SLI was 4885, not too good to be honest, i expected a little bit more. But... the problem is, when i start 3DMark05 i saw a big line on the bottom of the screen, with three colours, red on left and blue on the right side, and purple on the middle. Sorry for my language, i am not english, and it's a little bit hard for me to explain, but... all the time than the test was running, and when i am trying to play a game, i can see those lines displaying on my screen like an equalizer. is it ok?