Gigabyte HD 7870 OC - OCing

Hello guys, I am new here as you see and I am also new on OCing.

Just bought HD 7870 OC version from Gigabyte and got the driver for it from the web.
I see it has something called AMD overdrive. I saw a guide about overclocking : http://www.guru3d.com/articles_pages/gigabyte_radeon_hd_7870_oc_review,22.html

I tried to overclock my GPU with the same settings as describes at the guide, but I got a problem.
When I was playing sleeping dogs for some minutes it kept crashing and a blue screen appeared on my screen. I am not sure if I should overclock my "already" OCed GPU. I was wondering if you guys had the same problem with AMD overdrive and if you could help me a lil bit :D

My PC:
GIGABYTE GA-Z77-DS3H Z77 S-1155 ATX
Intel SSD 120GB
OCZ MODXSTREAM PRO 500 WATT PSU
CORSAIR 8GB DDR3 XMS3 INTEL I5/I7 PC12800 1600MHZ (2X4GB)
INTEL CORE I5 3570K 3.4GHZ 6MB S-1155 IVY
GIGABYTE RADEON HD7870 OC WINDFORCE 2GB PCI-E DVI/HDMI/DP
Fractial define R3
Sony DVD
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More about gigabyte 7870 ocing
  1. Check your temperatures of your graphics card with GPU-Z. If it's overheating, then we found your culprit. Anything about 90 is bad.
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