Wlfgang, which motherboard do you have? Is it an E7502 Granite Bay chipset?
S-Eagle, what video card do you have or are you planning on using in this machine? If you want to use a Radeon 9700 Pro, I would suggest a different motherboard, maybe one of the new SiS685 chipsets instead? I'm sure someone here can suggest one. If you don't plan on using a Radeon 9700, then you have no worries that I know about with your chosen motherboard.