Overclock.net › Forums › Components › Power Supplies › Chieftec BPS-850C and overclocked 780, lacking power?
New Posts  All Forums:Forum Nav:

Chieftec BPS-850C and overclocked 780, lacking power?

post #1 of 4
Thread Starter 
Hi guys!

Got myself a 780 and I'm trying to find its limits in regards to overclock. It seems, though, I may be finding the limits of my PSU instead. I've got this Chieftec model, that seems to have two 12V rails, for a total of 70A. I'm not sure this means ~35A for CPU and ~35A for GPU, or up to ~70A combined, meaning the GPU could take all the juice it wants up to 70A from its rail (of course, discounting the juice the CPU and other components need).

What happens is the computer hard resets on load, screen goes black, the GPU spins the fans at 100% for a few seconds and boots up again. I think it's the PSU because the symptom of too low voltage on the GPU is driver crash, not reset, this only happens when I pump >1.2V on the GPU.

I'm setting the 780 at 1,212V trying to hit >1240Mhz on the core, 1800Mhz on the memory. The CPU is a 2600k overclocked to 4500Mhz at 1.375V

So the question is, could the power supply be causing the resets?

Thanks!
Edited by r0l4n - 10/29/13 at 6:31am
post #2 of 4
Its a multi 12v rail PSU which means you need to make sure you dont overload one of the rails

Take one PCI-E cable and hook it up to one rail and the other cable to the other rail

Should work
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal x2 Dali Opticon 2 
AudioOtherOther
x2 Dali Opticon 1 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal x2 Dali Opticon 2 
AudioOtherOther
x2 Dali Opticon 1 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #3 of 4
Thread Starter 
Quote:
Originally Posted by shilka View Post

Its a multi 12v rail PSU which means you need to make sure you dont overload one of the rails

Take one PCI-E cable and hook it up to one rail and the other cable to the other rail

Should work

Thanks for the quick reply! The question now is which connectors in the PSU share rail...I'm not at home and can't find any resources online with the description of the connectors. I'll have to check if the manual states anything when I arrive home.
post #4 of 4
Thread Starter 
I replaced the graphics card with a 780 Classified, I can raise the vcore up to 1.3v and 1300mhz and the PC does not reboot, so I'm going to go ahead and say it was the graphics card causing the resets.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › Chieftec BPS-850C and overclocked 780, lacking power?