Sorry, I was too busy lately to update this thread.
I was just about to test how far the ram can go with 2x 1gb sticks at a time, but.....
I just found out my PC8000 kit (D9GKX IC's) is dead

One of the sticks gives errors every time when running Memtest, it fails every time at the same point in test #2 (and others)
I liked those sticks! I was hoping to get past 1.2GHz with those on the P35 board.
Ahh well, they have a lifetime warranty and Memory-Configurator.com have always been good to me, so I'm not worried.
I'm gonna see how far I can push the PC6400 ram with all DIMMS loaded.
I'm currently @ 950 4-4-4-18-3-30-3-3-8 2T (4 GB loaded). I'll try a few dividers and see how far past 1GHz I can get.