I have two HD5970 installed in a P6T SE motherboard in the two blue (x16) pcie slots and 2 out of 4 gpu's appears to be running at x8 speed given the information taken from ATI ccc and EVEREST ULTIMATE. I have the latest drivers (windows 7 64/ATI catalyst 10.2) and no RAID configuration (if that matters). I also have an i7 975 (stock speed). A single vga card also runs in both gpu's at x8 speed (installed in the first pcie x16 blue slot) instead of x16 speed. Is there a BIOS setting i need to change or something else?Any help would be appriciated.
i had some problems with my 5850, sometimes it was on x16 but it kept changing between x1, x4, x8 and x16 depending on its mood lol but i solved the problem by changing PCI-E Frequency in bios from 100 to 101. notice that i dont have a pci-e x16 2.0. i have only pci-e x16 1.0 or 1.1 whatever its called
One thing this board does not support currently is NVIDIA's SLI configurations, which is their multiple GPU solution for improving game performance. Three-way Crossfire is supported as well as ATI's CrossfireX with two 4870 x2s
But it didnt list anyhting with 5970's. maybe try a bios update?