2gb vs 4gb on 667 ram

Depends on the os. If you are on a budget I would say at least get the 2gb but if you can do the 4gb, I would do that.

edit: http://www.legitreviews.com/article/709/3/ This shows the score between vista with 2gb vs 4gb.

Ram is cheap. Get 4gb of DDR2-800, regardless of OS. Even if not quite all of it is supported, you will be maxed out. No reason to get 2gb with the prices this low.

if he has a 64bit os that 4gb of ram would come in very handy cause 32bit os's cant address 4gb of ram i would go with the 4gb though

Should go for 4GB. See if you can get the 2X2GB kit instead of 4X1GB kit.

4gb will make a big difference with CS3 for sure. I've used mine and watched the ram useage in task manager. I frequently blow though the 2gb mark, but almost never get past 3gb, so even with a 32 bit OS, I think you'd see a huge improvement going from 2gb to 4gb. Plus, ram is so cheap, you are looking at probably a $10 difference.

I agree, definitely look for a 2x 2gb.

2X2GB, even if he has a x86 OS.

As others have said, there's no point in only getting 2X1GB when RAM is so cheap.

Get the cheapest 2x2 gig set of DDR2 memory you can find (that run @2.1v or less). Even if it is DDR2 800, it will down clock to 667 and as others have said, even if he is using a 32 bit OS, it will allow you to use as much as possible.

if u want the best ddr2 available on the planet for the lowest price eever this is it http://www.newegg.com/Product/Produc...82E16820231194
damn i should get paid for every time i advertise those ram

and never ever trust OCZ for a rebate

Hmmm soo, let me get this straight. My brother is running a x86 Windows XP, his mother board says it supports up to 667 of memory, but still even if I buy ram sticks of 800 they will still be underclocked to 667?

They will run at the max speed of your motherboard, in your case 667.