Mac Pro Tower (4.1) Freezing Randomly

I have 40 Mac's at my facility. 27 laptops and 13 Mac Pro Towers (3.1) (4.1) versions, almost all of them have GT120's and are maxed out on ram.
First of all let me say I have
Reformatted the HDD (many many times)
Replaced the HDD (twice)
Replaced the graphics card (I have 8 new GT120's as backups for my machines)
Removed the RAID card
Removed the RAID drives so it's just the OS drive
Installed 10.5/10.6/10.7/10.8/10.9
Ran AHT
Ran 3rd party hardware tests (come up clean every time)
I have two machines that exhibit the same issues. They constantly freeze and crash. You could be surfing the web, editing in FCP 7, renaming a file, accessing a NAS, or simply sitting at the desktop and it will freeze completely. You cannot do anything on the computer, no mouse movement, no keyboard commands, it has to be restarted to work again. There are also no Kernal Panic's that show up.....
I have taken one of the Mac's into the apple store and it sat there for a week with a Genuis trying to figure out the issue, first they thought it was the video card, then they thought it was the HDD (brand new), then they thought it was the RAID card. So they removed them all and COULD NOT get it to crash. The day I get it back and hook it up it crashes (3) times on the user. No additional hardware installed no additional programs, its the same computer they gave back to me hardware/software wise.
What gives? I am scratching my head because I can't figure it out, and the geniuses can't either.

2008's can be very problematic and have personality disorders based on the number of problem reports that constantly get posted over the years and the issues began on day one with the infamous freeze on wake from sleep that firmware updates for EFI and SMC for the 3,1 may not have solved, but once the 4,1 2009's came out rarely to never see updates to firmware. 10.6.8 may be the best for some.
GT120s are not stellar and it use to be that having any two Nvidia GPUs even though it was a BTO option was causing trouble for many users.
FBDIMMs are another issue, thankfully Amazon has new cheap better FBDIMMs and you can use both 667 and 800MHz where cost can be cut slightly. Maxed out RAM for these means 32GB, not cheap back then, not always needed - and if it is then a 2009 or later is also probably needed. An SSD can do a lot to improve performance, though even a 2009 with slightly better PCIe 2.1 has its own glass ceiling on sharing slots 3&4 PCIe
Risers are rarely an issue. Heat though often is, which is why removing things can help except new FBDIMMs run a full 10*C cooler. Boosting the fan speeds with FanControl definitely has helped FBDIMM users.
Testing at a store you know that the power coming in is almost certainly going to be clean reliable and not an issue, and if that was the only area in question then some users have opted for new PSUs and had a 50/50 on whether that might help.
2009 models are more expensive and popular today than they were last winter, the new Late 2013 6,1 caused many 2008 and older owners to want to stay with similar tower.
Monitoring thermal sensors is a good idea, but generally less is more, and installing handy utilities that run in the background is not - they all have some effect and impact on stability and performance at the end of the day.
SSD are not only fast, and make a huge difference, they use little energy, no sound, and of course next to zero heat added.

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He's asking what are those things you are using, i.e., ...
What video card are you using?
What version of OSX are you using?
What model of mac pro are you using (e.g., 2010 Mac Pro is 5,1).
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Try smc and pram reset.
And see if the monitor lites up if you boot in safe mode.
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Hi-
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http://docs.info.apple.com/article.html?artnum=42642
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The great jurist Sir Edward Coke, who lived from 1552 to 1634, has explained why the term mortgage comes from the Old French words mort, "dead," and gage, "pledge." It seemed to him that it had to do with the doubtfulness of whether or not the mortgagor will pay the debt.

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http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-quad-2.66-specs.html
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