Hi, I just wanted to post my findings and experience with the crucial 8gb upgrade on a MBP 13" i5(early 2011). Couple people had asked me to post my findings so here it is. Installation: A five year old could do it Boot-up: I noticed my boot up is about 10 seconds faster. GPU: My Intel HD Graphics GPU is now at 512mb. In WOW I can now play at max fps and at fair graphics compared to me limiting the fps and having to play on low graphics settings. My processor has become considerably cooler when playing games. 4000rpm , 4gb ram: cpu = 79 DEGREES CELSIUS 4000rpm, 8gb ram: higher graphics/fps , cpu = 70 degrees celsius. Also i noticed that i can finally use after effects, photoshop, premier pro with a considerable amount of ram free except for ae Geekbench score 4gb ram: 5812 Geekbench score 8gb ram: 6209 If there is anything else you would like to know just post here and ill try my best to answer it from what i have experienced with crucial memory upgrade.