BSOD whale i playing games "win23k.sys\ntoskrnl.exe

hi
i have this problem BSOD whale am playing "bf4" i try to renstall OC same problem
my freind tell me its heat problem so i open the case and i have stand fan and i trun Air cooling on
and my heat whale am playing i use " CPUID HWMonitorPro "
cpu 45-55
gpu 40-59
so what the problem
and when the BSOD show on and i restart my PC sometime show black screen

Reboot and select proper boot device

or insert boot media in selected boot device and press a key

sometime don't starting win normal
the last BSOD when i shutdown and turn it on in the disktop showd this massage

Problem signature: Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 2049


Additional information about the problem:
BCCode: 50
BCP1: FFFFF900C3467CF0
BCP2: 0000000000000000
BCP3: FFFFF9600022E6CD
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1


Files that help describe the problem:
C:\Windows\Minidump\052814-23649-01.dmp
C:\Users\ALI-HERO\AppData\Local\Temp\WER-73258-0.sysdata.xml


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MY PC
win 7 ut 64 bit
i5-3330 3.0 GHz
gtx 660 2gb oc
ram 8 gb
ps 650 w " i don't know model name ''
hdd 500gb WD

this crash file " dmp "

-Ali

I can't confirm this with a Kernel Memory Dump as a minidump doesn't contain much.

You could try Memtest86.


Memtest86 will test your RAM

   Information

Run Memtest86 for at least 8 passes so we get enough information to confirm that your RAM isn't failing

I also presume that these events were happening before you changed your display driver?
And if so changing your display driver hasn't affected the frequency of the crash?