Is this a good build???

[ionthepeacemaker]

MB:Gigabyte GA-Z77X-UD3H
RAM:Cosair 8GB vengeance
CPU:i5 3570K
PSU:Seasonic M12II-620 620W
HD:Seagate Barracuda 7200.12 SATA 6Gb/s 2TB 64MB Cache SATA 6.0Gb/s Hard Disk
GPU:Sapphire Radeon HD7950 Vapor-X OC 3GB
Case:Cooler Master K281
This will be my first time building a PC and I want to make sure I did not make a mistake with this build.If there is a problem with the built, don't hesitate to say something.

Thank you

 

[Abstractfear]

Seems pretty solid to me. Make sure the GPU will fit into your selected case.