BSOD memory management?

There are two different crash dumps. Two different bugcheck codes, but the pointer is to the same thing, the display driver, though the display drivers are different.

Latest one .....

Code:

BugCheck 3B, {c0000005, fffff880119b5578, fffff880050907f0, 0}

Probably caused by : atikmdag.sys ( atikmdag+974578 )

Followup: MachineOwner
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Code:

    Image name: atikmdag.sys
    Timestamp:        Tue Sep 16 03:51:08 2014 (54176654)

Earlier one ....

Code:

BugCheck 1000007E, {ffffffffc0000005, fffff88011159dbb, fffff88003c51368, fffff88003c50bc0}

Probably caused by : atikmdag.sys ( atikmdag+c7dbb )

Followup: MachineOwner
---------

Code:

    Image name: atikmdag.sys
    Timestamp:        Fri Apr 18 07:43:16 2014 (53508A3C)

When multiple versions of display driver fail, the primary notion goes to the hardware environment.

Are you overclocking? The processor is AMD Phenom(tm) II X4 970 Processor, 3500 Mhz.

Code:

CP  F/M/S  Manufacturer     MHz
 2 16,4,3  AuthenticAMD    3516

As you are getting BSODs, you should stop overclocking and run all the hardware components like CPU, GPU and RAM to their default settings.

Report us the heat of the computer after a couple of hours of your normal usage. Upload a screenshot of the summery tab of Speccy. Alternatively, you can publish a Speccy snapshot too: Speccy - Publish Snapshot of your System Specs .

Stress test the Graphics Card using Furmark.

Video Card - Stress Test with Furmark

Take a screenshot of the furmark window before closing it. Upload the screenshot for us.