Radeon 7770 MSI Fails When Use After Burner

[kahasima]

I am currently have MSI R7770-PMD1GD5 Radeon HD 7770 GHz Edition 1GB 128-bit GDDR5 PCI Express 3.0
When I try to overclock it by using MSI after burner, It gets failed when I play CS Global for about 10 minutes.
It also happens when I run Krombuster
I tried to increase the "Power" not voltage because this card doesn't unlock the voltage. It still fails

I wonder if there is any way to increase the performance of the card ? Not running on default you know
Please help!!

 

[kahasima]

I have:
+core i5-3570k running at 4.2ghz
+NZXT 750w with 80 plus bronze
+MSI Z77A-G43
+8gb(4x4) 1866- latency 9-9-9-24
+intel 520 180gb SSD
+MSI R7770-PMD1GD5

 

[getochkn]

What are the temps on it before it crashes and aren't the ghz editions already overclocked factory?

 

[kahasima]

What are the temps on it before it crashes and aren't the ghz editions already overclocked factory?

The temperature is still fine around 60C. :| Is it fine for VGA? because CPU temperature can reach to 100C. My core i5 reaches to 70C when I run Prime95