OK, I just bumped the Vcore voltage up another notch - Set to 1.3125V in BIOS
PC Probe II is reading Vcore as 1.29V
CPU temp is at 45C - 48C at idle (as I type this).
MB temp is 43C
I did get a freeze on the first boot and had to reboot by hitting the Reset button.
My Video Card:  http://www.evga.com/Products/Specs/GPU.aspx?pn=15FA5BF1-AADA-454D-8BDB-40F4BFBE959E
 
It has been suggested that I also bump the RAM voltage up by 0.01V to 0.05V
That may be my next step...
 
Thanks everyone for your help!!!
 
Sushihunter
 

Just had a total lock-up.
Was watching a YouTube video when the screen went black and I got a loud buzzing in the speakers.
Control-Alt-Del would not break out of it - had to hit the reset button and reboot.
 
Sushihunter
 
 
On Fri 29/07/2016 10:05:03
PM GMT your computer crashed
crash dump file: C:\Windows\Minidump\072916-55832-01.dmp
This was probably caused by the
following module: ntoskrnl.exe (nt+0x32D9E7)
Bugcheck code: 0x124
(0x0, 0xFFFFFFFF8D6038FC, 0x0, 0x0)
Error: WHEA_UNCORRECTABLE_ERROR
file path:
C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel &
System
Bug check description: This bug check indicates that a fatal hardware
error has occurred. This bug check uses the error data that is provided by the
Windows Hardware Error Architecture (WHEA).
This is likely to be caused by a
hardware problem problem. This problem might also be caused because of
overheating (thermal issue).
The crash took place in the Windows kernel.
Possibly this problem is caused by another driver that cannot be identified at
this time.

My CPU default voltage, no overclock, ASUS P5N-D motherboard and Q6600 is 1.350v. I thought that was a little high myself but others say this is the normal voltage for my CPU. IDK.

Went into BIOS and made some more changes
Vcore left at previous setting of 1.3125v
Changed CPU PLL voltage from Auto to 1.60
 
I note that PC Probe II is now reporting CPU temp at 52C - 53C - a slight increase.
But keep in mind that it is also very hot here right now  23C with 65% humidity - was 85% about 8 AM!  Probably warmer in the apartment...
CPU only has stock cooling fan from Intel - nothing special.
 
Sushihunter
 

Download core temp and set your vcore to what the vid states.
 
e.g.
 

 
1.325v would be the default voltage for a G0 revision Q6600.

This is what I have right now.

And here it is after changing Vcore to 1.3250v
The temps spiked, but have settled down to around 68C on core#0 and 65C on the other 3 cores.
 

It took a while, but just had a couple of short screen freezes that Cntl-Alt-Del was able to break out of. A few minutes later, I had a Display Driver crash as seen in one of the above photos I posted.
Is it getting better? I don't know - too early to tell, but it SEEMS a little better. No automatic random reboot - so far...
 

No blue screens yet?

If you haven't received any blue screens my next suggestion would be to retest the ram. Make sure to test each stick individually this time if you didn't check them individually last time.