Quote: Originally Posted by Read Only
Is DDR3 not compatible with my mobo?
I very seriously doubt it.
I just looked at Newegg--it appears that 4 GB sticks of DDR2 are quite uncommon and expensive---Newegg's price is 180 for two 4 GB sticks of that Crucial RAM.
You have a few more choices if you go with 2 GB sticks. You can get two 2 GB sticks for 100 to 110 from several manufacturers.
Are you positive you are running out of RAM?
I'd guess your PC is 4 or 5 years old. Considering the high cost of RAM for it, you might consider getting a new motherboard, processor, and 8 GB of DDR 3 RAM (which is much cheaper). If you spent 400 or so, you would effectively have a new PC that would be noticeably faster than your existing PC, with more RAM to boot.