GA-Z68XP-UD4 build unstable

Hi all. Experienced builder here looking for ideas on freezes/crashes from web brower.

Used parts combined with proven parts that I already own.

parts in question:
GA-Z68XP-UD4 v1.0 BIOS U1L
Patriot DDR3 1600 G2 RAM
i5 2500k with CM Hyper 212 Evo (runs super cool)
running Windows 8 Pro 64bit.

All other components have been working in my Core2Q Q6600.
Corsair TX650v2, GA GeForce 560 Ti, LG SATA DVD-RW, Corsair Force GT 120GB SSD (5.05 fw), WD 1TB Black HDD.

NOT OC'd at this point, RAM running at 1333Mhz. Optimized defaults + AHCI enabled. The system exhibits the same problems when OC'd to 4.2Ghz.

System has the occasional cold start reboot loop issue where it restores the BIOS to default after ~5 cycles. This is not the problem. I can attempt to live with that. Seems to be a common plague with Z68 boards.

The weird thing is that the system will crash when just browsing the web (IE or FF). I might just happen at desktop, but I always have a browser open, so I'm not sure if it would happen without a browser. It has never crashed while stress testing or gaming. Rock solid while under load. Multiple-game DOTA sessions are regularly played and it is super solid.

Usually I have music playing via google music, but not always. When it crashes the sound glitches (if I have music playing) and the mouse and keyboard are completely unresponsive. Sometimes it just take 10 seconds then it restores itself, other times I have to restart it because it never comes back.

I always have too many tabs open when it freezes to find out if it is specifically a flash problem. Can't tell if flash might be somehow crashing the whole system. Flash should be isolated to not be able to crash the whole show, just the browser, right?

The RAM has been tested with memtest86 4.2 for 8 hours without an error.
The processor has been stressed with Intel Burn In Test for maximum stress/RAM usage for 10 iterations multiple times. Temps are in the mid 50s under load at stock clock.

I have tried using both the latest drivers from the Gigabyte web site as well as grabbing the latest drivers from component's respective manufacturer. No different outcome.

Ideas besides RMAing MB? (Which I am free to do, I have a Gigabyte RMA number in hand, I just want to avoid CAN to USA shipping and back).

My top possible answers:
Windows 8 unstable with driver's in use? Try Win 7?
Still possible that RAM is bad even after memtest ok?

Suggested next steps? Or just bite the bullet and ship my motherboard off for RMA?

Thanks fellow helpful geeks!
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More about z68xp ud4 build unstable
  1. What is the Part # and amount used of this -> Patriot DDR3 1600 G2 RAM?

    Did you install Windows 8 Pro on the GA-Z68XP-UD4 v1.0 system or is it the installation from the Core2Q Q6600 system just moved over to the GA-Z68XP-UD4 v1.0 system?
  2. Completely fresh Windows 8 install for this system.

    The RAM is: PGD38G1600ELK
    4GB x 2 kit
    9-9-9-24 timings
    1.65V (hmmm. XMP profile 1 is 1.6V, problem?)

    Anyways let me know what your feedback is on the RAM.
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