I'm planning on switching to an iMac (when I save enough money) until then, i want to upgrade my PC ram from 512mb to 2 GB. I went to crucial.com and ran their memory test. The sites lists DDR PC3200 as compatible (Guaranteed) however my PC documentation states that the fastest speed of ram is DDR PC2700. I would obviously want the faster ram but I want to be certain that I can put this in as my local computer store is a bit harsh on returns. I'm not familiar with PC motherboards so I'm hoping someone can help me before i drop the cash to upgrade. For reference my Motherboard is a MSI MS-6547 (645 ULTRA) Thanks for the help!