These strips increase the RAM in my MacBook White (mid-2010 model 7.1) from 2 GB to 8 GB. They work perfectly well, despite the indication from Apple that the maximum memory possible on this model is than 4GB. Easy replacement (10 min) according to Apple's operating instructions. The computer has found its 'normal' functioning fast. Under Lion, and with 3 users, it slowed to be unusable due to lack of memory. I recommend it.
