I am planning to get the AMD Athlon 64 3800+ 2.4GHz Socket AM2 Processor but I still can't decide which is the best motherboard but my case might be too small, the dimensions of my case are 17.75Length x 6Width x 16.5Height and also I don't know if the motherboard will be able to be placed where the holes to screw it in are, the motherboard which I was thinking of is Gigabyte GA-M555SLI-S4