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Price breakdown by merchant
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.00 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($22.99 @ Micro Center)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($89.79 @ Newegg)
Memory: Team Vulcan 8GB (2 x 4GB) DDR3-1600 Memory ($68.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: Sapphire Radeon R9 270 2GB Dual-X Video Card ($155.38 @ Newegg)
Case: Corsair SPEC-02 ATX Mid Tower Case ($39.99 @ Micro Center)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($57.98 @ SuperBiiz)
Total: $608.10
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-07-29 22:15 EDT-0400
This PC can easily play nearly any game on high settings at a smooth 60fps, or maybe on ultra at 45fps or so. For the money, this is a very powerful PC. This will be much more powerful than any prebuilt machine you can get new for $600, however keep in mind that DayZ isn't very optimised at the moment, so you're not going to be getting 50-60fps pn high settings unless you have a much more expensive machine, however this PC should still be able play things like battlefield 4 on high at 60fps, same for many other games, and DayZ will still perform quite well at about medium settings.
The R9 270 can be easily overclocked to be just as good or better than the R9 270x,
The motherboard is a very high quality ASUS board that's very good for overclocking.
The CPU cooler allows for a very good overclock, you can probably get to around 4.5GHZ.
The HDD is a high quality WD Caviar Blue, this is one of the most reliable drives on the market.
The PSU is a high quality XFX PSU, on of the best PSUs for this price range.
The case is one of the very nice new Spec cases from Corsair, these are very well built and have room for up to 6 case fans with 2 included, so you have plenty of room to upgrade the case fans in future. The case also comes with a nice window to display your build.
The memory is very good quality Team Vulcan memory, which can also be overclocked.
If you have the cash to upgrade in future, I suggest adding a 120GB or 250GB SSD.