That ram looks great; I just wonder whether or not I'd be able to keep my current overclock if I switched? Also, if I bought that ram, seeing as how I have 2 empty slots on my mobo would it be worth it to use the ram I have now plus this new ram (isn't 32bit windows limited to 3.5 gigs?)?
I was considering the 4850 as well and was wondering if the brand made any difference because from the link you provided I found this : http://www.newegg.com/Product/Prod [...] 6814131125 which is $125 after the rebate.
oh nice find, i didn't see that . it should be the same. usually cards under diff. brands differ. in the cooler/warranty or if its an OC edition. yea get that one if ur gonna settle on the 4850.
your OC should be fine. this ram is way more than enough to handle your OC. if you do get the ram though, take out your other two sticks. first off, ima go out on a limb and say they are not the same speed (the one i linked u is 800mhz) and 2nd. they are not using the same voltages, and it's not recommended to mix up diff.speed rams, not to mention diff. voltages.
4gb is more than enough. trust me. and since you're using a 32bit OS, unfortunately ~3.25gb of ram will be usable. that could always be fixed with vista64 (if you want)
Since you're running at 1680x1050, I would recommend a 4870 or gtx 260 if your power supply can power them. Then sell your 7800gt and buy another 2-to-4gb of ram.
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