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Yah. Given what I've got to work with in this thread, I'd say I'm ~85%+ confident your issue is processing capability.
There's an i5-760 Lynnfield @2.8GHz for about $15 more than the i5-750 Lynnfield 2.66GHz; about +$30 from an i5-650:
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http://www.newegg.com/Product/Product.aspx?Item=N82E16819115067I'd shoot for that if I could swing it. Shop around. Don't know what websites you check, but clearly I rely on newegg as a place to start, then google about & look for others that seem reputable and can compete.
http://www.tigerdirect.com/ and
http://www.geeks.com/ area couple more; hopefull other suggestions will show up here ... I'd like a few more to bookmark for myself.
There's always the possibility that you're configured wrong with your OS. Look for excessive processes running or high CPU/mem use when you think you've got everything shut down to idle. However, the CPU you listed is a bit aged, so it just seems like a solid bet. Sorry I can't issue you a guarantee ...
But, it's more than processor because you're also jumping up to a more modern mobo and DDR 3 RAM, probably running at 1600 or 2000 MHz, so that should liven things up nicely. G.Skill, BTW, and its Ripjaws Series, is getting very solid props. I've used it for a couple of upgrades & it works solid.
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http://www.newegg.com/Product/Product.aspx?Item=N82E16820231303 ($98)
Has outstanding timing numbers for the price: 7-8-7-24-2N, for example. $3 more and it's even a bit better:
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http://www.newegg.com/Product/Product.aspx?Item=N82E16820231276 ($100 / 7-7-7-21)
Your video card seems pretty solid for what you're doing, but I'm no gamer, so you need advice from someone else on that.
The mobo I listed earlier is only one possibility. Use it to compare specifications. I like that one for its many connectors and lots of expansion room. You could go to a smaller board with that 890FXA chipset & AM3 socket and you'll still be state-of-the-art, maybe find one on special for ~$125-$145 or so.
The one I listed above was $179 yesterday w/ rebate. MSI is not necessarily the best, but that board reviewed well and was on the lower end of cost. There's always Gigabyte & Asus. If you're in no hurry, select several boards that look good for your needs and check once a day on these sites; one of them'll go on special and that's when you grab it and save $20 or $50.
I'm not trying to be AMD evangelical, but that Phenom II X4 965 Black Edition @3.4GHz can be taken up to 4.0 and 4.2 GHz. In that range, it compares very favorably against the i5 760. You can shave down costs a bit by getting a board that overclocks solidly ... of course you'll want to google about & do it with a clue.
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http://www.extremetech.com/article2/0,2845,2368074,00.asp (Overclocking Guide for n00bs)
Extremetech or tomshardware.com also recently had a solid rundown on AMD mobos; pretty much listed the top five this summer (one of which is the MSI above). Both good sites to start at; I'm sure they also have something on i5/i7 boards if you search around.
You can learn a lot just reading the comments sections on these products at newegg. Lots of those geeks post what they did, problems they ran into, gear and workarounds needed, for Intel & AMD. Saved me from several mistakes, so, one another recommended resource.