nForce4 + PCIE Radeons - anybody?

[Vladimir Kushnir]

Hi all,
Has anybody had any luck with this combination? So far no matter what I do 
stock X (xorg-server) just hangs my box, and xorg-server-snapshot displays 
absolutely distorted picture (wrong timings?) with xterm pulled over 
entire screen and so forth :-(
Box: -CURRENT (the same was with 5.4 release), Athlon64 (naturally :-), 
Asus A8N SLI (not Deluxe), Sapphire Radeon X600

TIA,
Vladimir