I have a Mac Pro 1,1. A week or so ago, I had the ram chips go bad on me. I replaced them with a set of these: http://www.amazon.com/dp/B007G9Z670/ref=pe_175190_21431760_3p_M3T1_ST1_dp_1 Question: the old ram chips each had a heat sink attached to them. Do I need to remove them and place them on the new chips? FWIW, I replaced the old video card with an ATI Radeon HD 4870, which does produce a fair amount of heat.