differences between these graphic cards and will they work with my computer?

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Jan 6, 2013
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Hello guys, so long story short I bought a computer from magicmicro, actually many computers, I bought 3 same ones for 3 of my cousins and two of them worked very well but one of them which the graphic card had a problem a few months after I purchased.

I'm looking to replace that graphic card right now, here is the specs:

AMD FX-6300 Piledriver (Vishera) 3.5GHz (Six Core) 32nm, AM3+ 8MB Cache

Spire Kestrel-King II AMD 64 fan

ASUS M5A97 LE R2.0 AM3+, AMD 970, Cross Fire, SATA3, USB 3.0, HD Audio

4GB (2x2GB) PC12800 DDR3 1600 Dual Channel

AMD Radeon R9 270X 2GB PCI Express 16x Quad head DVI, HDMI

1TB Western Digital Blue 7200RPM SATA 3 6.0Gb/s 32m cache

LG 24x SATA DVD Recorder +R/RW -R/RW

Realtek HD digital audio (onboard)

Ethernet network adapter (onboard)

PowMax Black Mid Tower ATX Case w/ Front USB

Thermaltake TR2 600W ultra quiet ATX Power Supply, SLI & X-fire ready

Black Windows Keyboard, 104 key

2-Button Wheel Mouse, PS/2 Black

Black Multimedia amplified stereo speakers

Microsoft Windows 7 Home Premium 64bit DVD w/SP1

Standard assembly and test 3-5 business days

So I'm thinking about to buy the same graphic card with the same company, http://www.magicmicro.com/pmoreinfo.asp?iid=9659

or buying new ones on newegg, these were the options I found:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202049&cm_re=r9_270x-_-14-202-049-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202059&cm_re=r9_270x-_-14-202-059-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202161&cm_re=r9_270x-_-14-202-161-_-Product

Now I'm just wondering what are the differences between these graphic cards? Will they work with my computer?

If you guys recommend any other graphic cards please let me know.

Thanks for your help and time.