Unfortunately don't think that solved it. Got another BSoD, no dump either since it couldn't find a drive to dump to. =|

I've now swapped the drive off of the SATA 6Gbps port to a 3Gbps port,...

104577

Hey, thanks for the reply.

No worries, I am also rather busy, take your time. Thanks for helping me out!

The L1C63x64.sys driver is I believe related to the Atheros 8151 GigE LAN...

Interesting to note is that the sata drives are not bootable at the time of crash. Restart leads to no boot device. However, simply waiting a few hours resolves the issue until the next crash.
...

Ah, yes, unfortunately some of the bugchecks do not produce dumps. They hang at 0% for hours and I am forced to reset the system. Possibly the system cannot find the drives to write to...

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Specs:
GIGABYTE GA-Z77X-UD3H rev 1.0
Intel i5 3570K @ stock
GIGABYTE Geforce 670 Windforce 2gb @ stock
Seasonic M12II 520 Watt Bronze
2x G.SKILL Ripjaws X 4GB 1600 @ stock
2x G.SKILL Ares 4GB...