E5200 stomps those 7750s as well for the same general price for platform...
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All of those are under $70 and have been used multiple times to overclock E5200s to 3.8ghz and beyond.
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Roughly the same price as the 7750 but a MUCH better CPU, all the 7750 is is a chopped up Phenom I...
I also agree with IMMA, for a higher end build id NEVER look at one of those case+PSU deals, but in this case you will probubly be well within the max wattage of an OEM PSU.
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Not the greatest cooler but should be able to handle that system without any issues.
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You MIGHT need to use one of those 4 pin to 6 pin PCI-E connectors with the PSUs but other then that Id say it would be fine. Take the money saved and throw it at this, or just leave as is and take the savings.
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Also better ram for cheap...
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I also agree unless you can get yourself that hard drive for the listed price garanteed then id just grab a different drive, although the WD blacks are really fast they arent going to amount to any gain in FPS which from what I can tell is what your looking for as its listed as a budget gaming build. You should probubly answer the sticky questions about your build in your original post so people like us know what your using it for ect.
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The Builders Hammer
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