As I said before I wanted to get a new computer anyway,and although I wasn't planning on getting one with 4 GPUS,I was thinking about it,to make it a repsectable mining rig for a few months...
If the only important part is the GPU does that mean I can get away with using my old P4,by simply getting a new GPU?I've seen someone using a P4 at the "Post a picture of your rig" thread but I'm not sure if it is sufficient..
That P4 is going to be a huge bottleneck relative to your GPUs. However, a very nice, modern motherboard and CPU can be had for $200-300 if you want to come fully into this decade =)