BSOD (memory_management) ntoskrnl.exe+7efc0

CPU: Intel I5 - 650
Motherboard: Aspire X3950
Ram Speed, size and #sticks: 8Gb total, 2 sticks of 4gb Kingston
GPU: Geforce GTX 560, version 9.18.13.697
PSU: CoolerMaster 460w
OS: Windows 7


Attached is the saved text file from Bluescreenviewer, usually I crash when playing games like TF2. It has never crashed from casual web surfing, and only started about 3 weeks ago. I was playing TF2 for about 4 hours earlier and it either BSODed with said info in the textfile, or froze while my game sounds stuttered.

I also realize that my psu may be a little underpowered for my current setup, but I can assure you ever since I upgraded my computer, it has not given me any problems.

Actions taken so far: Chkdsk, disk cleanup, advancedsystemcare cleanup

Temp while idle: 39c
Temp while gaming: 65

Im not too sure what else to add, I'll be back here later when it BSODs. Thanks guys for taking a look!

Yes, swap out that CoolerMaster power supply, for a better brand

Okay, I'm considering getting a new one, but why would my PC work properly earlier and only act up now? Also, do you have any brand recommendations for wattage needs?

Because that power supply has probably degraded over time quicker than a better brand supply. All power supplies will fail after a lot of use. Corsair, Antec, Thermaltake 650 or so watts. Here's an example:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044