New build keeps crashing!

[Ethereal2011]

Made a new build for my GF however it keep crashing, and for the life of me I cannot work out why. I have tested all of her components in my comp without any issues, so I am not sure it is a hardware issue.

We bought the following items:
MSI HD 7770 Power Edition Transthermal OC 1024MB GDDR5 PCI-Express Graphics Card
Intel Core i3-3220 3.30GHz (Ivybridge) Socket LGA1155
Gigabyte Z77-D3H Intel Z77 (Socket 1155) DDR3 Motherboard
Western Digital Caviar Blue 1TB SATA 6Gb/s 64MB
OcUK Battle 650W Dual Rail High Efficiency
GeIL EVO Leggera 8GB (2x4GB) DDR3 PC3-17000C11 2133MHz Dual Channel Kit

And the usual case/cooling bits.

The crashes happen very often and at any point. During boot up, during log in, during gaming, and when it is doing nothing, it can crashes 10+ a day, to the point that she doesn't use it any more, and obv I would like to get this fixed

Everything on the comp has been updated, and it is running Windows 7 64bit.
I have ran checks on the disks there fine, we installed windows and her drivers on 3 diff HDD's and they all crashed.

Everything is properly connected, and it is not running hot, and I have no idea why this could be happening

Any clues? If you need certain reports to help let me know

 

[Ethereal2011]

I will dump my PSU in the rig and see if it stays steady. We actually ended up with a dif PSU than the one we ordered. We asked OCuk CS but we never got a reply

 

[Ethereal2011]

what bios are you using? and what memory dram and qpi/vtt voltages? random shut offs can be memory related also

How do I find out the voltages?

 

[Ethereal2011]

look in the bios,look for dram voltage and cpu/vtt voltage you might need more with 16gb of memory,try setting x.m.p if your memory supports it,it will setup the memory for you then

its all in the bios

Thanks, will have a look at this when I get home tonight