Phenom II 975 Black -vs- i5 2300

I've seen a lot debate here on these two. I have 2 nearly identical systems to choose from. This will be mainly a gaming PC. So here they are, which one is the most bang for the buck?

Phenom II System:

AMD Phenom II X4 975 Black Edition 3.6GHz + Patriot Gamer 2 Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Combo - $151

http://www.newegg.com/Product/Product.aspx?item=N82E168...

Seagate Barracuda 500GB 3.5" SATA 6.0Gb/s + CORSAIR Builder Series CX500 V2 500W Power Supply Combo - $125

http://www.newegg.com/Product/Product.aspx?item=N82E168...

ASRock 770iCafe ATX AMD Motherboard - $60

http://www.newegg.com/Product/Product.aspx?item=N82E168...

XFX Double D Radeon HD 6870 HD-687A-ZDFC Video Card with Eyefinity - $170

http://www.newegg.com/Product/Product.aspx?item=N82E168...

Diablotek EVO RPA-6170 Black Computer Case - $35

http://www.newegg.com/Product/Product.aspx?item=N82E168...

SAMSUNG 22X DVD Burner SATA Model SH-222BB/BEBE - $15

http://www.newegg.com/Product/Product.aspx?item=N82E168...

Grand Total: $557.92

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i5 2300 System


Intel Core i5-2300 + GIGABYTE GA-H61MA-D3V Combo - $236

http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...

PowerColor AX6850 1GBD5-DH Radeon HD 6850 - $140

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Seagate Barracuda 500GB 3.5" SATA 6.0Gb/s + CORSAIR Builder Series CX500 V2 500W Power Supply Combo - $125

http://www.newegg.com/Product/Product.aspx?item=N82E168...

Diablotek EVO RPA-6170 Black Computer Case - $35

http://www.newegg.com/Product/Product.aspx?item=N82E168...

SAMSUNG 22X DVD Burner SATA Model SH-222BB/BEBE - $15

http://www.newegg.com/Product/Product.aspx?item=N82E168...

Grand Total: $587.85