Windows 7 BSOD 0x0000003b & 0x00000050

I bought an pc from my friend (which has a defekt) i fixd it (new mainboard) and now i get from time to time the BSOD Codes 0x0000003b and 0x00000050, i checkd my HDD and my RAM (0 errors). And ich switchd my RAM manuell to 1600Mhz with 1.550Volt and my CPU to 1.550Volt.
In a German forum they say it could be the power supply. If u think so too i think i will buy a new one.

Here is my pc setup:
16 GB RAM (Corsair Vengeance RAM)
500GB Hitachi Festplatte
Intel Xeon CPU E3-1245 V2 @3.40GHz (8Kerne)
NVIDIA GeForce GTX 660TI (4GB Memory)
Windows 7 64 Bit
Asrock B75 PRO3-M Mainboard Sockel 1155
Power Supply Corsair AX650


----------------------------------------
BSOD:
Crashlist part 1: Pic-Upload.de - Crashlist-part-1.png
Crashlist part 2: Pic-Upload.de - Crashlist-part-2.png

Also here are the dumps:
dmpfiles.zip (183,38 KB) - uploaded.net

Here is the link to it : https://onedrive.live.com/redir?resi...F798E451%21708

i thought i installed it via windows 7 updates but i was wondering how a service pack can be that small (17,5mb) i think i will install the sp1 from the win7 page. Thanks, i will update the post if the BSOD comes again

btw: i installed wp1 sp1 from the updater last night. So if u took the dmp files to look for my wp7 version this is outdatet. The right version is in the files i uploaded 3 Houers ago: https://onedrive.live.com/redir?resi...F798E451%21708

Sure, i uploaded the same zip new here
https://www.sevenforums.com/attachmen...1&d=1409476502

Yeah i installed it now from the download page, i will say something if the BSOD appears again, thanks :)