Ok I've been searching for good deals on either 1gig simms or 2gig (2x1) setups for my Intel iMac. Anyway, I would like to buy Samsung ram, as it's never failed me, and most people seem to like it. Newegg doesn't have it. Macsales.com doesn't have it. And I'm positive it's pc5300, 677mhz (pc2, pc, whatever, i know what it is) So I go to Samsungs website. But I find two different kinds: PC2-5300 DDR2-667 non-ECC DIMM Memory (also non-registered) - 119.98 PC2-5300 DDR2-667, ECC, non-Registered DIMM - 199.98 So one with ECC and one without it, the difference being ECC makes it cost 80 dollars more. Does it matter which I get, and why? I can't seem to find if the 512 installed in my iMac is ECC or not. Help appreciated.