I have an Intel 2.4mhz iMac and want to upgrade the memory. Found a compatible offer from TD/CompUSA for 4 GB for $14.99 after rebates. Sounds to good to not take advantage of. BUT, is this offer a compatible option? Here it is... OCZ SLI-Ready Dual Channel 4096MB PC6400 DDR2 800MHz Memory (2x2048MB) any help would be appreciated.