This is the one I use:
http://www.memoryexpress.com/Product...6%28ME%29.aspx
My CPU temps used to run around the 65-70 degrees mark. Now they hover around 56ish, with my current max temp in HWMonitor at 62 degrees. I know running at 70 degrees isn't that big of a deal, but whatever. I bought it and it lowered my CPU temp by about 10+ degrees. That's all I really care about.