Which is a better system?

[xXNahNahXx]

Pay no attention to the gpu or the the psu, will upgrade slowly over time
(Only difference is the mobo)

Build 1
CPU: AMD FX-8350 4.0GHz 8-Core Processor
Motherboard: Gigabyte GA-990FXA-UD7 ATX AM3+ Motherboard
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: PowerColor Radeon HD 5450 512MB Video Card
Case: BitFenix Shinobi Window ATX Mid Tower Case
Power Supply: EVGA 500W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply

Build 2
CPU: AMD FX-8350 4.0GHz 8-Core Processor
Motherboard: Asus Crosshair V Formula-Z ATX AM3+ Motherboard
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: PowerColor Radeon HD 5450 512MB Video Card
Case: BitFenix Shinobi Window ATX Mid Tower Case
Power Supply: EVGA 500W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply

 

[Spinny99]

Build 2 is a better build because of the motherboard, but there a few things you can change to make it even better. Your CPU is 8 cores, most games aren't optimized for 8 cores yet, let alone 6. I'd bring your CPU down to the FX-6300. It's a hex core, and is a bit cheaper. With that money you just saved, put it in to the GPU. Assuming your gaming, that GPU sucks for it. Go with a GTX 770, preferably the Asus DirectCU II.

 

[Tradesman1]

Go with the Crosshair, far better mobo