|Newer P4s (the 600 series) were 64-bit CPUs.|
"currantly as 512gb ddr2700 ram with 2 slots won't fit 2x 2gb ddr2700 ram 1 in each slot will this work?"
I believe standard desktop DDR1 memory tops at 1GB per module. Unless you have 4 slots, you can't have 4GB.
Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182