CMD8GX3M4A1333C7 suddenly erroring

Hey,



I've had my CMD8GX3M4A1333C7 kit for a few years now and about 2 weeks ago I suddenly noticed programs crashing and was getting bluescreens. I was running them at 8-8-8-8-22 2T at 1.7v because they have been a bit temperamental from the beginning.



So I ran memtest86+ 4.20 and saw some errors. I experimented a bit with timings and voltage settings but never got them stable.



I even increased the timings to 10-10-10-26 2T and at 1.775v, but still the same errors: http://ift.tt/1tagh63



So next I removed the sticks from slot #2 and #4 to see which one of the sticks is faulty.

When I ran memtest with the sticks in slots #1 and #3 I got errors: http://ift.tt/1qfoXV5



But when I ran memtest with a single stick (#1 OR #3) it ran ok for 6 hours.



I'm not really sure how to proceed from here. Is there anything I can still try with the BIOS settings? Are the RAM faulty? Is it the mainboard?



BIOS settings:

http://ift.tt/1tagdTH

http://ift.tt/1tagdTJ

http://ift.tt/1taghmh



The PC specs of my profile are up to date