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Original post by: rgstout ,


I inherited an old iMac (A1224) mid-2007 20" Core Duo 2 2.0GHz, with the rock-bottom specs for this model.

I first bumped the RAM from 1GB to 4GB for $20.

Next, I bought a X7900 (pulled from a A1225 iMac) on eBay for $59 and replaced my T7300 CPU, using the iFixit guide. (It took about 2 hours.)

My Geekbench 3 (64-bit) score went from 2135 (T7300) to 2916 (X7900). While running Geekbench, the CPU temp went from 30 C up to 48 C (iStat menu). So I get about a 37% increase with the X7900 over the T7300, which is pretty much consistent with the Geekbench numbers reported on the Everymac website.

I'm currently running OS X 10.8.5 on this iMac, with Office for Mac 2008 installed. Both Word and Excel run noticeably faster with the X7900.

After a couple of days usage, I've experienced no problems with the upgraded iMac so far.