I would also agree on increasing your RAM.
It's also important to note that; while the 4Gb memory limit is from 32-bit operating systems, it also includes your GPU's onboard RAM which gets priority.
So, if your card has 1Gb onboard RAM, your 32-bit operating system will only see 3Gb of the new 4Gb RAM total you are increasing to.
In such a case, I would go for a 1Gb increase.
If you're using a dual channel system, you probably have 4 slots with 2x1Gb sticks already in place.
You might want to add 2x500Mb sticks in the other two slots.
Make sure it's the same type (DDR2, etc), and the CL ratings match the sticks you already have.
So, if you have 3200, CL 3.5, you're looking for the same stuff, preferable from the same manufacturer.
And buy both sticks as a pair.
[edit: Having more RAM won't hurt the system, it just gives it more to play with which makes it perform better, graphically.
If you put 4Gb in and you have 1Gb on the card, it just won't see all 4Gb.
Just seemed a possible cost saving so I mention because RedSkwirrells have Scots blood (and I'm tight).]
p.s. I was in AZ not three weeks ago!
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