Cubemonkey Posted October 7, 2011 Share Posted October 7, 2011 I've run in to an issue where my systems will not post, and I think the AX850 (or my install of it) is the issue. Old system 7/2009 to 10/2011: i7 920 EVGA X58 SLI LE mobo 6GB ******** Gold Ram XFX 5870 AX850 bought over the summer. HAF-X case New system: i5 2500k ASRock Extreme7 Gen3 Mobo 3x 2GB 6950s 8GB ******** Sniper 1866mhz AX850 HAF-X case Regarding my old system, for awhile I had it OC'd to 3.9ghz. Last winter, I decided to run it stock (no need for OC). While it was running stock, I bought the AX850 and installed it. In September, I tried to OC it again and with even a small OC it wouldn't even post. I assumed that the chip or mobo was just dying. No other problems. Left it stock and decided to upgrade. Fast forward to this week. New system runs fine all stock. Trifire 6950s are blazing. I start OCing the 2500k and get easily up to 4.3ghz. All mobo settings on auto. At 4.4ghz, it won't post. I've tried all sorts of settings after doing a ton of reading. No luck. If you're not familiar with it, a 4.3ghz max OC on a 2500k is extremely rare. Since I have strange no-post issues on both chips, which I know OC very well, I suspect something is up with my AX850. Any way to test this? If the 8-pin connector to the top of the mobo is somehow faulty, could that cause this issue? Link to comment Share on other sites More sharing options...
parsec Posted October 8, 2011 Share Posted October 8, 2011 If the eight pin mother board cable was not providing power to the board, it most likely would not POST period. I've heard of people using a four pin connector from the PS when the board has an eight pin connector, and the board would not POST. It is important to have that cable in the correct modular connection on the PS, the PS connectors for video cards are not the same, opposite polarity (ground and hot swapped) and only three have +12V, rather than four on the mother board connector. The same goes for the cables, but I'm sure you have those correct. Running three 6950's is quite a load on the +12V rail, so you could say not much left for the CPU when OC'd. If I can trust my hardware monitoring program, my i7-2600k at 4.6GHz is using ~110 Watts when running Prime95. I'm sure your CPU would not use more than that, they are both 95W TDP CPUs. If your PS was stressing out, it would show signs of it and maybe even shut down. Is the fan running at high speed when you test your OC or when gaming? Have you checked the 12V rail reading with software to get some idea of where it is at? Link to comment Share on other sites More sharing options...
peanutz94 Posted October 8, 2011 Share Posted October 8, 2011 Since I have strange no-post issues on both chips, which I know OC very well, I suspect something is up with my AX850. Any way to test this? If the 8-pin connector to the top of the mobo is somehow faulty, could that cause this issue? The only real way to test that would be to use a multi-meter and measure the voltage at the 8pin connector. Make sure you hit all 4 hot wires and see if you are getting a constant voltage. You can measure it at stock and with your OC. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted October 10, 2011 Corsair Employee Share Posted October 10, 2011 Peanutz, Do you have another psu to test with perhaps? Since your having the same issues over two systems I recommend you apply for and RMA and have the PSU replaced. Thank you Link to comment Share on other sites More sharing options...
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