http://www.newegg.com/Product/Product.aspx?Item=N82E16820104230 It IS compatible with the 2720QM and 2820QM (maybe lower CPU models but I didn't care to check). Benchmarks show that sandy bridge WILL run faster with a DDR3 1600 kit vs DDR3 1066 or DDR3 1333. From what I understand, DDR3 1333 is used in the MBP that ship .. does ANYONE know what the Cas Latency (CL) is? I would guess 7-8 ... hopefully it's not 9! Otherwise one might as well buy the RAM I linked above as it has the same CL but a higher frequency and is cheaper than Apple's 8Gb upgrade!