BSOD irql-not-less-or-equal

I get this bsod alot like 2 times a day.
Now since I can't find a solution.
Can someone help me?

What kind of information do you need?
 
Post any minidumps by going to: C:\windows\minidump. Minidump files have a .dmp extension. Select all the .dmp files and right-click, sending the files to a compressed(zipped)folder. Upload that folder as a file here
 
Your ATI video driver is causing this trouble. Do you see any yellow exclamation points (!) in the device manager?
 
ATI video driver?
I got an AMD radeon 6800 HD.

But no, no yellow exclamation points in the device manager.
 
Processor: AMD Phenom(tm) X6 1100T Processor 3.30 GHz
Video card: AMD Radeon 6800 HD
Ram: 2x 4gb Kingston
Network card: Atheros AR8151 PCI-E Gigabit Ethernet Controller
Sound card: AMD High Definition audio device
Cooling: Water cooler Corsair
Motherboard: ASRock 870 Extreme3 R2.0


I recently removed 2 ram pieces. I had 16 gb Ram. Now 8. (removed them 2 - may)
I haven't had any bsod yet since then.
 
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