Need help determining the root of the problem...

This is my first post, and I'm coming to this forum out of despiration.  I built a PC with the following specs in March, but i've never been able to get it to run stable.

XFX 750i FTW MB

Q6700 CPU

OCZ Fata1ity PC-8500 RAM 1066MHz

BFG 9800 GTX+

I'm running Windows 7 RC and Ubuntu 9.04 dual boot.  At STOCK speeds for both RAM and CPU Prime95 quits in seconds due to a hardware failure.  Games like Unreal Tournament III randomly lock up or cause blue screens.  Occasionally while web browsing it will blue screen with what seems like a different error message each time.  I have reset the CMOS countless times, updated the BIOS to the most current version, I have support tickets open with both the manufactures of the RAM and motherboard.  They each point the finger at eachother.  I have run BurnInTest and come up with errors in the RAM, but I've run memtest86 for two hours and no problems.  Then I ran it again and it crashed saying Unexpected Interrupt-Halting.  I don't think thats a RAM error.

The RAM reports in the BIOS that it's default speed is 800MHz and voltage is 1.9V when it is supposed to be 1066MHz and 2.0V (according to the OCZ website).  At 2.0V windows won't even boot it only boots at 1.9V.  I took out the RAM switched slots and I noticed that the stick itself says 2.2V!  So I uped the voltage in the BIOS to 2.2 and it boots, however things are even more unstable - Unreal Tournament III locks up more frequently, and Prime95 almost immediatly reports an error and halts.

All fans are running and temps when checked with SpeedFan are within range ~35C - 60C.

Is my CPU bad?  Is it the RAM?  The motherboard?  Or even the videocard?  I need some help, and both OCZ and XFX seem like they don't want to budge on the RMA.  I need to narrow down this problem.

Thanks for the help... sorry about the long post but I thought I'd give as much detail as possible.

I forgot to mention that the RAM timings are set to the recommended settings from the OCZ tech.  6-7-7-20.

If the stock timings and voltage don't work then they should rma the ram. If you want to try to work it out and not continue fighting with them I would try the following. relax your timings a bit. Set the freq to 800. Now start with the 1.9V and run super pi. I would keep slowly raising the voltage until you can get super pi to pass then try prime 95. If you can't get prime 95 to pass no matter what the voltage is with what I suggested there is no point going further. Send it back to the manufacturer.If you do find a good voltage you can try raise the DDR freq back up. You may need to increase vlotage a little more to get it stable.just be carefull when raising the voltage not to much and watch your temps. Thats what I would try if you think it's the ram.

When you say OCZ tech, do you mean tech support?  If so, they're telling you the wrong timings.  The timings are supposed to be 5-5-5-15.  This isn't the first time that I heard tech support tell someone to run at lower timings.  It's a crap maneuver on their part and if you can't run it at that, you may be out of luck getting it to run at its full potential.  I'd give them a call again and rma it.  Hopefully you won't pay shipping.

Also, your volts are wrong according to the site.  They should be at 2.1v.

No they're right...  I have the 2GB sticks (2 2GB kit) The 5-5-5-15 timings are for the 1GB stick kit.  The OCZ guy just told me that the motherboard isn't designed to run 1066MHz that's why its crashing.  The timings according to CPUZ for 800MHz are in the image.

Hey mentaldisorder just noticed you have a 750i board and a similar set up.  What speed are you running your OCZ ram at and what are the voltages and bus speeds your using for you CPU?

My ram is at around 960, however I'm overclocked and I haven't tried pushing it yet.  The 2.2v is needed for me to keep from a BSOD from the overclock.

The 750i is supposed to run 1066, I've seen it overclocked higher...

No Face:

No they're right...  I have the 2GB sticks (2 2GB kit) The 5-5-5-15 timings are for the 1GB stick kit.  The OCZ guy just told me that the motherboard isn't designed to run 1066MHz that's why its crashing.  The timings according to CPUZ for 800MHz are in the image.

EVGA specs

Based on NVIDIA nForce 750i Chipset chipset
Supports Intel Core 2 Extreme, Intel Core 2 Quad, Intel Core 2 Duo, Pentium EE, and Pentium processors

Memory
4 x 240-pin DIMM sockets
Dual Channel DDR2
Maximum of 8GB of DDR2 533/667/800/1066MHz
Expansion Slot
2 x PCIe x16, 1 x PCIe x1, 3 x PCI
3 x 32-bit PCI, support for PCI 2.1
Storage I/O
1 x UltraDMA133
4 - Right Angle Ports x Serial ATA 300MB/sec with support for RAID 0, RAID1, RAID 0+1
Integrated Peripherals
7.1 Channel
1 x 10/100/1000
Multi I/O
1 x PS2 Keyboard
1 x PS2 Mouse
8 x USB2.0 ports (6 external + 2 internal headers)
Audio connector (Line-in, Line-out, MIC)
FireWire 1394A (1 external, 1 header)
Form Factor
ATX Form Factor
Length: 12.0in - 304.8mm
Width: 9.6in - 243.6mm
Notes:
Also OCZ has 2 versions of that fatality ram one runs at 5 5 5 10 and one at 6 6 6 7! Need tofind out which you have by model number!

I found this set of timings I dont have a intel cpu or EVGA board but these settings came from a setup like yours maybe they,ll help! Also you might check your Bios version!

RAM voltage - 2.0v
Unlinked
FSB 1333
RAM @ 1066
Timings - 5-7-7-20
tRRD-4, tRC-32, tWR-6, tWTR-10, tREF-Auto

Hope Im not butting in just trying to help!