My development machine is heavy on memory usage. It currently only has 4GB of PC5300. I'm going to buy 8 GB of RAM, but should I take out all my existing memory and install just PC6400 or leave some of the original and stick with 5300? I don't know if I'll ever need more than 8GB, I might, I'm just wondering if the speed difference between 5300 and 6400 is worth trashing the 2 or 3 GB of old RAM I would still have room for after adding the new RAM.
migrated from serverfault.com Jun 17 '10 at 6:51
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If your job runs in 8gb, the faster 8gb will be a little faster.
If your job takes 9gb, the 10gb will be dramatically faster than the 8gb.
If your job takes 11gb, you'll need to test to see which is faster; it's likely but not certain that the 10gb would be faster than the 8gb.
If you're not sure, go for the larger amount of ram.
If you're worried about cost, go cheap. Any RAM is faster than swapping to disk.