I am hoping someone out here can help me on this. I just built a new system, specs are: EVGA X58 SLI LE, 6 gig corsair Dominator RAM(1.65v 1600), EVGA 295 GTX, i7 920 (cooled with Corsair H50)& Ultra X4 1200W PSU.
After putting the system togther I ran it for 2 days without issue. However, immediately after I tried to OC the CPU all heck broke loose. After hitting save and boot in the CMOS the system shut down (like it should). But, when it tried to reboot the system started for about a second then shut down again. It went into this endless loop of comming on and going off. They only way to stop it was to shut off the toggle switch on the PSU. Interesting enough it I let the machine rest for about 30 min after which system would boot normally. (no BIOS changes ever took effect). So I started to think it had to be one of 4 problems. 1.Bad PSU 2.BAD mobo 3. BAD memory 4. BAD CPU. When I did get the system running I checked the BIOS under PC HEALTH the 12 rail was running at 12.55 v. On the upper side of the (+/-) 5% of allowed. At any rate I sent it back and got a new one that is now running at 12.3 v. Still alittle on the high side but should not cause this kind of issue. I called EVGA (which by the way are awesome to deal with) after much testing including using a barebones config and testing 1 stick of ram at a time determined that it may be a BAD BIOS chip. So they set me up with a RMA and sent me a new mobo. After getting the new board the problem persisted. I called EVGA agian and they said the mobo I returned checked out perfect. So at this point I ruled out the PSU and MOBO, next I tried to swapped out the Video card (i figured this was a long shot) with a NVIDIA 9800 GT, still no change in the system. Called EVGA again and concentrated on the memory and CPU as the prim suspects. In the BIOS the tech had me check the RAM voltage, which was fine at 1.66v. We tested each stick of RAM. Only one stick allowed the system to post, but only once. An important note to make here is they system will run fine when it is stone cold. Only after the system runs for 10min and you attempt a restart will the cycling take place. So somehow someway it has to be a thermal problem, right? The CPU at max load (stock speed 2.66) only got up to 27C.(gotta love that H50) So I'm left thinking at this point it has to be the memory controller on the CPU. I have a new CPU and Memory coming in the next few days. Does anybody else have any clue on what is going on here? I have been building systems for 20 years and never seen anything this before.
After putting the system togther I ran it for 2 days without issue. However, immediately after I tried to OC the CPU all heck broke loose. After hitting save and boot in the CMOS the system shut down (like it should). But, when it tried to reboot the system started for about a second then shut down again. It went into this endless loop of comming on and going off. They only way to stop it was to shut off the toggle switch on the PSU. Interesting enough it I let the machine rest for about 30 min after which system would boot normally. (no BIOS changes ever took effect). So I started to think it had to be one of 4 problems. 1.Bad PSU 2.BAD mobo 3. BAD memory 4. BAD CPU. When I did get the system running I checked the BIOS under PC HEALTH the 12 rail was running at 12.55 v. On the upper side of the (+/-) 5% of allowed. At any rate I sent it back and got a new one that is now running at 12.3 v. Still alittle on the high side but should not cause this kind of issue. I called EVGA (which by the way are awesome to deal with) after much testing including using a barebones config and testing 1 stick of ram at a time determined that it may be a BAD BIOS chip. So they set me up with a RMA and sent me a new mobo. After getting the new board the problem persisted. I called EVGA agian and they said the mobo I returned checked out perfect. So at this point I ruled out the PSU and MOBO, next I tried to swapped out the Video card (i figured this was a long shot) with a NVIDIA 9800 GT, still no change in the system. Called EVGA again and concentrated on the memory and CPU as the prim suspects. In the BIOS the tech had me check the RAM voltage, which was fine at 1.66v. We tested each stick of RAM. Only one stick allowed the system to post, but only once. An important note to make here is they system will run fine when it is stone cold. Only after the system runs for 10min and you attempt a restart will the cycling take place. So somehow someway it has to be a thermal problem, right? The CPU at max load (stock speed 2.66) only got up to 27C.(gotta love that H50) So I'm left thinking at this point it has to be the memory controller on the CPU. I have a new CPU and Memory coming in the next few days. Does anybody else have any clue on what is going on here? I have been building systems for 20 years and never seen anything this before.