I was chatting with Mark Imbriaco the other day and he mentioned that there were reports that the older MacBook Pro's could handle 6GB of RAM, and since I recently had one of my 2GB chips go bad so I figured why not and ordered a 4GB chip. I bought my MBP about 15 months ago, the Model Identifier is MacBookPro3,1.  I was going to order from NewEgg but since they were sold out I ended up ordering from MemoryC.

The chip arrived today, I installed it, and everything seems to be working perfectly. The About This Mac windows shows 6GB:

And between a 3GB VM, a bunch of applications, and some large Ruby strings I managed to show that it was using all the memory:

6GB!

-James

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