<I think the biggest impact to photo processing speed is the amount of RAM. CS5 and LR both use huge amounts of RAM >
I agree, but for use in CS5, Lightroom etc I obtain acceptable speeds. I believe that very high RAM is more relevant to gaming, however 8Gb will help photo software I'm sure. i still go along the line of PC clutter being the real rogue. as explained in another thread earlier today, I partitoned off part of my hard disk and dedicated it to my photo software programs, this helped greatly.