I have a KT7 RAID with two IBM 75GXP drives in RAID configuration, a soundblaster player 1024, a network card, a modem, a ASUS V7100 geforce2MX card, an IRDA interface, an usb mouse and keyboard, a cd writer and a DVD player, and it all works fine!! i just had to remove the soundcard from PCI slot 5 which shares an irq with the raid controller. my soundcard is in another pci slot now and it works fine!! i got my athlon 800 running at 1Ghz and my cheap PC133 CAS3 Ram is running at CAS2 and the fastest settings.
the KT7 faq really helped me a lot!!
I checked performance with Sisoft Samdra, and my pc is faster than the Athlon 1Ghz listed in the benchmark results.