Ya it should work but dual channel stress memory more so sometimes there are soem compatibility issues. With quality ram it should work tough.
Both stick will runnin at the same speed/timmings.
The speed&timmin will be those from the slowest stick.
Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-3-3-8, Leadtek FX5900@450/875, 2X30gig Raid0