Memtest86 - No errors, but locks up?

[Majorai]

So I have been having a lot of blue screens with my main PC, at least once a day.
Specs:
i7 4970k @ Stock
16GB Corsair Vengeance DDR3 1600MHz
MSI Z97-G45 Gaming Mobo
MSI GTX980 x2 SLI

The Blue screens I'm getting are usually one of the following (I get at least one every time I boot up):
Page Fault in NonPaged Area - quite a lot
Memory Management - loads of these
PFN List Corrupt
Bad Pool Caller

When I swap the RAM for another set - no problems. So I thought I'd run memtest with the 16GB, no errors came up, but after ~8 hours It locked solid, the timer just stops, I left it running for a couple more hours to no avail. I'm confused as to why no errors would appear, yet the test locked solid - seems a bit strange.

Note: I was running Memtest on my testbench, to rule out a bad mobo.
Specs: AMD FX 8120
ASUS M5A99x EVO mobo.

Bassically, I need to know it's RAM, and not a major software/driver etc error.

 

[Tradesman1]

Do you have the latest BIOS? If not give that a try. Your BIOS may not be setting up the DRAM correctly.

 

[Majorai]

Apologies, forgot I had posted this. After deciding to buy more RAM, no errors whatsoever.

I was pretty confident that it was set up correctly in BIOS (and with no overclock).

Marking your reply as a solution in the hope that if someone has similar issues, they check BIOS before buying new RAM unnecessarily.

 

[Tradesman1]

I'm glad all is well now, sorry I didn't see your thread earlier 🙁

 

[Majorai]

No worries, I appreciate the help .