Display Driver Crashes and BSOD's w/ new GPU

I recently built a new computer using the following parts:

Motherboard: ASUS P8Z77-V PRO
Memory: CORSAIR Vengeance 16GB (2 x 8GB) DDR3 1866
PSU: CORSAIR HX Series HX750 750W
Storage: 2 x OCZ Vertex 120GB SSD in RAID 0 Configuration and is also the boot drive
320GB Western Digital 7200RPM HDD as a data drive
CPU: Intel i5 3570k
CPU Cooler: Corsair H70 Core w/ 2 Corsair SP120 static pressure fans
lastly,
GPU: MSI R7870 Hawk

I have the CPU overclocked to about ~4.4Ghz using the ASUS motherboard's TPU switch and the AI Suite II's automatic overclocking utility.

My main issue has been more of an annoyance than something that keeps the computer from functioning. I have been attempting to overclock the GPU which is pretty much made for overclocking considering it has the TwinFrozer IV cooler along with other OC features. My problem though is that even with minor overclocks like 1140 Mhz core clock and 1250 Mhz memory clock while playing pretty much any game I'm having issues with the display driver crashing (I'm assuming that's what is happening as the game freezes, goes black and then flashes back.) This is as compared to the default speeds of 1100 core clock and 1200 memory clock. Not only does the display driver crash I also get BSODs every so often, eight in total now .

The BSODs I'm getting mostly have the error code 0xA0000001 which seems to be cause by atikmdag.sys usually. I also recently tried using 3DMark 11 to benchmark the system and it would actually perform worse when I overclocked the card. The CPU score was always good but the GPU score was rather low. For overclocking I am using MSI Afterburner and watching the GPU temps they have never gone over 53C which I know is a safe temp.

I have BlueScreenView and Windows Debugging Tools installed if you would like more information on the BSODs or any other information.

I hope this is the right section to post this and thanks to anyone that can provide some help.

Edit: I did some further testing with 3DMark 11 and received these results:
Non-OC:
Score: 5883 Core Voltage: 1218 mV Core Clock: 1100 Mem Clock: 1200 Max Temp: 44C

OC:
1st Attempt the display driver crashed during the CPU & GPU test
Core Voltage: 1225 Core Clock: 1215 Mem Clock: 1330 Max Temp: 47C
2nd Attempt
Score: 3535 Core Voltage: 1225 Core Clock: 1200 Mem Clock: 1300 Max Temp: 46C

Both scores are for the GPU only.

Full Non-OC Scores:
SCORE
P6129 3DMarks
GRAPHICS SCORE
5883
PHYSICS SCORE
8542
COMBINED SCORE
5523

Full OC Scores:
SCORE
P3832 3DMarks
GRAPHICS SCORE
3535
PHYSICS SCORE
8548
COMBINED SCORE
3206

Okay, specs are updated. Didn't even notice that was there.

Just an update, because a lot of the blue screens were caused by atikmdag.sys I tried using Windows Driver Verifier and after turning it on the computer wouldn't get past the black screen with the windows logo on boot.