BSOD playing some games, usually 0x04e error

Post results and dumps whenever you're able to.

Your dumps show no definitive cause and some still show memory as the problem.

Anyway, start with SFC Scannow it will repair corrupted windows files and asks you to reboot when its done.
SFC /SCANNOW Command - System File Checker

Follow the tutorial below to make sure your hard drive is not having any problems.
Disk Check
You can also take hard drive test from your hard drives manufacturers website

By the way, could you lend ram like from your friend? Insert them to your pc and see how your computer performs?

Let me know

I'd advice you to lend from a neighbor or friend first for a test on how stable your computer is, if you see that its stable then you will be sure that its your ram has problems.

Do you have a onboard graphics on your motherboard? If yes switch you can switch and see if your computer is crashing while using that way

Are you overclocking your ram?

Thanks & sorry if I ask too many random questions. I am new to debugging.

Now can you tell me if this is your motherboard ASUS - Motherboards- ASUS P8P67 PRO

Click on the specification tab, does your memory dim etc match with the ones given on that link?
Is your ram a complete 8 gb stick or 4+4? If its 4 each just insert one stick at a time and see how your computer performs (freezes, bsod, hangs).

Let me know