Quote Originally Posted by Black R
I have a sony VAIO, PCG-GRX520; will this work for me?

Sony VAIO PCG-GRX520 (PCG GRX520) Memory
Maximum Memory 512MB
Memory Slots 2 (2 banks of 1)

sorry it won't work for yours..
i think yours can only take 2x256MB and its DDR mine is DDRII sorry and thanks for your interest