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And datora, Amd phenom 3.2 Ghz can overclock to 3.8 on the stock fan?
Yes.
Check the feedback at newegg ... which is an excellent idea for all parts, no matter where you actually buy them. Newegg geeks post back all sorts of useful tidbits, fixes, advice & work-arounds.
A 955 can usually go up to 3.8 GHz on stock cooling; rarely they don't quite make it and you're limited to ~3.6 or ~3.7 ... but lots of folks take them to 4.0 GHz, also. You will see them regularly recommend a good thermal grease (like arctic silver) instead of stock, which is like +$5 or so. Personally, I'd feel more comfortable with an advanced cooling block, both for extra quiet and for lower temps ... but the chip runs at 3.8 GHz within its safe parameters, and folks post regularly it's stable for extended use on the stock cooling block.
It's also why I like that you're looking at G.Skill ... you'll likely be taking that up to 2100 from the rated 1600 to match the overclock on the CPU and get some extra performance. The Ripjaws series has a solid rep for handling that without problems.
As mentioned earlier ... you'll use some extra wattage, but the power supply advice you've been given so far is pretty solid; a 630 or 650 should take care of you quite well.
I'm also glad to be corrected on the price for the 955 ... I think I was mixing it up with the 965 when I posted my estimates.
As far as hard drives go, you can look for/wait for the Hitachi to go on special for $60, which it did over Memorial Day weekend. Some people swear by them, I'm still a little skeptical given some of the reviews I've seen. I am very happy with my
Samsung F4 2 TB drives (just got two of them for $70 each) ... but, again, this is using them as they are designed: as mass data storage-archive. NOT intended as your OS install drive.
Western Digital
Caviar Black drives come in 2 TB, also. I'd still hesitate to use it as my OS install ... but these are significantly more robust than most other drives and are designed for performance. If you must use a 2 TB for your OS, then seriously look into trying to afford one of these. They were $190 just a month ago, now are $150, and were on special for $130 last weekend.
Now, keep in mind that all hardware has its flukes. It's always possible to get an item that fails upon delivery or during the initial burn-in. Another reason why newegg rocks ... they have pretty much the best RMA policy of anybody right now. You're playing the odds by building your own, but all the recommends you've received here are steering you in Good Directions. Your chances of a component failure are very low ... but not zero. You'll just have to roll with it; it's the same chances we all take.
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EDIT: missed this deal over the weekend:
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http://www.newegg.com/Product/Product.aspx?Item=N82E16811147145Normally $70, was $54; really great looking case with lots of nice features and copious cooling capacity. Advice: sign up for the newegg email newsletter and keep an eye on their deals in real time. Two to four newsletters each week, sometimes with 24-hour specials that are pretty amazing.
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http://promotions.newegg.com/NEemail/latest/index-landing.aspxis where their newsletter gets posted, but not all of them and sometimes a day later than the email gets sent out. Subscribe as an E-BLAST Insider in the header.
This is quite pricey, but could have been do-able under the different price models that have been posted in the previous comments:
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http://www.newegg.com/Product/Product.aspx?Item=N82E16820227706A top-end SSD using SATA III specs, 120 GB for $255. That would be very substantial room for all applications, and they'd run at full available performance of any motherboard out there right now. Tweaking hardware & looking for best prices, you could swing something like this on your $800 budget. But still, a 64 or 80 GB is enough, so you don't really need to get all the way into this price range. By October/November, price structures on these should change substantially, too.
Also, something I forget often, you'll need at least a DVD player/burner. For me, there is only one:
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http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007589%2050001315&IsNodeId=1&name=ASUSASUS. If you can still find a PATA model, get it. A DVD burner cannot use the throughput of a SATA connection, so you can save one SATA connection this way and use it for a hard drive, or maybe a BluRay player/burner if you need/want one. I got a PATA version last year for $18 delivered on special; the SATA version also shows up at about that price pretty regularly. The ASUS DVD burners are a monument to reliable workhorses; can't speak to their BluRay since I don't do that. The only equivalent I consider are the Plextors, and they usually go at a good couple dollars more. ]