For now, you can not use this type of memory on an AMD platform.
You should get 2*1024 DDR pc3200 (if you don't overclock you better get valueram).

I Changed already a lot to what I had in mind but I think it will be be a much better pc this way.

Is everthing now compatible and will this work good for gaming?

A8N-SLI deluxe
amd athlon 64 x2 +4400
twice geforce 6800 gt
twice Seagate Barracuda 7200.8 400GB Ultra
WD raptor 74GB for OS
twice kingston 1GB 400MHz DDR
X-Finity™ 600 Watt PSU - Titanium
Logitech G15 Gaming
logitech mx 510 performance

Thx to everyone who's helping

two 7800's maybe? ;D

one 7800GT >>> 2x6800GT
stick with one GPU if possible

take a Seasonic 500W PSU, that is more than enough for a single GTX

also get the new G5 gaming mouse from Logitech