I want to buy the 4 GB kit: http://www.memorytogo.com/comp_mode...Quad+Xeon+2.66GHz+~mid~99591280~src=rmskr.htm $212 is so ridiculously cheap! It makes me a bit suspicious, so is there anything I should be worried about here? Has anyone bought from them before? It's to upgrade my mac pro 3.0, but 2.66 and 3.0 take the same RAM, so that shouldn't be a problem...right? Photoshop's been lagging crazily, below 30% efficiency etc. Thanks for any feedback.