Computer Freezing

EVGA 790i Ultra SLI
EVGA 9800GTX+
OCZ OCZ3N1800SR4GK
PC Power and Cooling 860 watt
WD Velociraptor 300GB
Q9300

Ever since I built my computer I have had the occasional freeze from time to time, and no matter what I do I can't figure it out. I have posted this same topic on the EVGA forums and on the Nvidia forums, maybe you guys can help me out.

Basically, my computer will freeze on random once or twice a day if I'm playing left 4 dead, warcraft 3, or call of duty 4. It'll freeze about once during a 20min video I'm streaming off of the internet (sometimes more during the episode, sometimes less) and finally it freezes A LOT if I try to work with photoshop. I have frozen once right after the BIOS posted, once after windows made it to the desktop and was loading my startup programs, and once in firefox loading an image from an email.

I have never frozen in any stress test program such as 20 passes in Intel Burn Test, OCCT, 12 hours of prime95, or 14 hours of memtest (I have ran these programs numerous of times, have never frozen) I've never frozen in more intense games such as Crysis, Crysis warhead, Unreal Tournament 3, and alittle less intense, Aion, and Team Fortress 2 (which uses the same source engine as Left 4 Dead)

I posted my BIOS template over at EVGA and tried every BIOS configuration there is. I'm an overclocker so the funny thing is I was able to get this "stable" at 1800FSB, no errors in the stress programs listed above. I also have water cooling so temperatures are not a problem. But for the sake of trying to figure this freezing problem out, I'm running at stock link/sync 1333.

What I have done so far to try and fix this:
Reformatted 3 times, twice with Windows Vista, Once to Windows 7.
RMA CPU
RMA Motherboard (3 times)
RMA video card (twice)
RMA Harddrive
Bought a new Harddrive
Tried a buddies power supply (same make and model)
RMA Ram
Bought new RAM
Tried one stick patriot 1333 ram
Tried ram in all slots
Tried BIOSes P06, P07, P08, P09
Unhooked everything but my core needs (vid card cpu psu 1 stick of ram and hd)
Tried stock cooling
Bought an UPS
Bought a new monitor
Tried different mice and keyboards
Added plastic washers to all of my screws
Replaced the SATA cable 3 times

That's all I can think of for now, I'm sure theres more. There has to be some kind of hint as to why it freezes a ton more in photoshop, than playing a game, and why it never freezes during more stressful games/programs.

Thank you for taking the time to read all of this, I really hope I can find the problem. I'd like to upgrade and keep this computer for along time, but from what I'm seeing after substituting everything on it, it's going to be impossible to fix. I've built plently of other computers so I don't know why this one is giving me trouble.

What cooling are you using for the northbridge?

Do the settings/timings in the Match your ram's settings and timings? Sometimes if you have 1.9V ram, the motherboard sets them at 1.6V.

How old is the processor? Did you OC previously (to what speed using how much vcore) and for how long a period?

Regarding the new CPU you received, was it OEM or in a sealed retail box?

Photoshop is a core and memory intensive app. Any slight hiccup could cause it to the system to lockup. But I don't understand. Can you exit the app under task manager when it freezes or do you get a complete lock and have to do warm boot?

Back to basics. All the BIOS settings should be auto or deafult. I think it's your RAM that's the problem.

Try your RAM at 800 Mhz, 6-6-6-18.

I only have one video card. I also kinda doubt it's my ram considering I've bought new ram, and have tried some patriot 1333 ram. That's 3 different ram modules that's doing the same thing...