What should I upgrade for better gaming performance? $350 budget

GPU/ and maybe CPU. If you do upgrade CPU, then Mobo

you really need to upgrade the MB,CPU,RAM and GPU's. to get to where you can really game with decent settings.

The 8400 Wolfdale was a great gaming CPU, but I think its nearing the end of it lifecycle.  

$350 is a tight budget to do all that. a AMD x4 965BE might be possible on that budget, but I don't think it wouldn't be a big enough performance gain. and i5 Sandybridge is the direction you would go for good true upgrade but that is ~$350 by itself. so basically you would need around $500-550 for good upgrade

that being said, a good GPU would be the best bag for the buck - HD 6870 or a HD 7850 and then save whats left over for a CPU/RAM/MB upgrade later, maybe after we see what Ivy bridge brings to the gaming table.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
if you are a nVidia fan a GTX560ti
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The CPU is fine imo. Upgrade the GPU, but you'd have to throw both of the ones you have in SLI. If you were to just upgrade the GPU, I'd go with a 7870.

So I think I'm going to go with a EVGA 560 Ti and upgrade from 4gb to 8gb of ram for now. My next investment will be on the CPU.

the dual core processor isn't as good as some people would have you think. It'll play but you can't add cores. The video card sucks. This would be the only thing I would spend money on. I'd over do it as much as possible in hopes of moving it to another build in the near future.

Bad idea AMD right now. Extra cores but yours and that lack the performance of today's new stuff. Waste of money, waste even dropping a quad in yours.

Don't need more than 4gigs of memory. Another waste of money.

should have listed monitor/res. and stuff you do with machine.

Bah, just realized my motherboard doesn't support any more than a total of 4gb of ram. I'll just be upgrading my video card for now and hoping it makes the difference. I'm going to be using this for guild wars 2 and WoW. Current display is 23 inches with 1680x1050

If I just upgrade my video card and have a 400ish budget (and I'll be purchasing from best buy). Which would be the biggest bang for my buck?

A 7870 if you want to use it all on the GPU. If you want to save for a CPU upgrade a 6870 should be great for your resolution.

I'd get an MSI Twin Frozr II OC 7870... best possible bang for your buck.

8GB of RAM isn't completely necessary in my opinion... 4GB will last you. Are you using up all four gigabytes? Try opening task manager while gaming, and look at how much of your memory you're using.

Best buy isn't carrying the 7870 yet and all their prices are sky high on the cards they do carry.

^What? He never said anything about best buy... I think that might be a carry over from a different thread.

EDIT: Oops, stupid me. He did write that. Anyway, I would buy from newegg... bestbuy isn't good.

I wouldn't buy from BestBuy unless they were having a store closing sale on exactly what you wanted. The 7870 is now $350-ish

(http://www.nothingbutsoftware.com/catalog_type.asp?Prod...)

but should be dropping down to around $330 very soon. I would save the remaining $70 for other upgrades.

How about this http://www.tigerdirect.com/applications/SearchTools/ite...

A 6950? It's really power-hungry, and the 78xxs are a better deal.

Yes I'd recommend a 7850 over a 6950 at the moment.