upgrading to qx6850

I am upgrading my E6750 with a brand new and sealed QX6850. I upgraded my BIOS from P30 to P33, and had no problems with the new BIOS on my computer while I was waiting for my new CPU. Once I received it, I uninstalled the old CPU from the device manager, and installed the QX6850. My computer will now continuosly reboot at the microsoft loading screen with the bar. I do not get any errors, but twice out of 100 reboots, I get a BSOD. I tried all types of CPU voltage settings. I also tried one memory stick in slot 0 at a time. With the same results. The only way I can get all the way into Windows is by disabling 2 of the cpu cores. With 3 or 4 cores enabled, it will never work. I have seen other people in these message boards, with the same problem, replace PSU's and clean installs with no luck. Anything else I can try?

qx6850, windows vista home premium 32 bit, Corsair Dominator 8500C5D, dual xfx 8600gts in SLI mode, evga 680i 122-CKNF68-A1, Coolmax 600W power supply, Seagate ST350063 0AS SATA II Hard Drive, PLEXTOR PX-800A CD/DVD Drive

I tried that with no luck. With 2 cores enabled, it will tell me that there is no startup repairs needed. With all 4 cores enabled, it will just start to reboot while loading the files from the DVD drive.

Doing more research and I found that with my motherboard, Revision C will not work with QX6850. Revision D will work with the CPU. But I do have the revision D motherboard.

680i's and Quads are dicey at best. Some work, some do not.

Youd be further ahead either getting a decent 780i board if your married to SLI, which with a pair if 8600GTS's you really not. Or simply get a P45 or an X48 board. P45 if you only plan on a single card, X48 if you want Xfire.

You need to drop fsb down to 1066, and start moving up a little at a time to get anything stable. Higher fsb is overclock, and 680i cannot handle fsb overclocking. Use highest multiplier possible to get the lowest fsb possible.

It's subjective. 1333mhz fsb is reliable only for duals. 680i have trouble handling quads. For example, most people with q6600 are stuck at 2.8ghz, or around 1200mhz fsb. Google it and you'll see. What Nvidia says their chipset is capable of isn't to be counted on.

Dont forget about the hard drive corruption that will happen sooner then later with 680i.

Another problem I found I was having was Everest only showing 2 cores being utilized. I used vista gadgets for monitoring quad cores, and they showed only 2 cores also. for anyone who upgrades from a dual core to a quad core... be sure to do this after you set up your bios. Go to system configuration>>> Boot>>> Advanced Options >>> Uncheck Number of Processors. I guess when you have a dual core, default is the have the box checked and set to "2" processors. It only has option for 1 or 2. So I guess my system was only booting two processors every time. I unchecked the box, and restarted. Now I have 4 cores on my Everest and vista's quad core monitor gadget. Yeah!!!!

As far as the stability of my system, I did get 2 BSOD while surfing the internet throughout the day. But my system was beautifully stable while playing Crysis for an hour. So I am still up in the air about leaving my FSB at 1400. If I continue to get BSOD, then I will drop the FSB back down to 1200. I will keep ya'll posted.