Umm, what kind of motherboard is it and who told you such nonsense? Any PCI-Express v2.0 motherboard can run ANY PCI-Express card whether it's ATi, nVidia, Matrox, etc. that uses PCI-e v1.0, v1.1, v2.0 and v2.1. You can use whatever card you want. Whoever told you that pile of sheep-dip needs a hole driven in their head to let their brain get some oxygen. Those temps are fine btw. The Radeon HD 4xxx series can run stable at 100C.