Overclock.net › Forums › Graphics Cards › NVIDIA › OC'ing SLI, possible PSU issue?
New Posts  All Forums:Forum Nav:

OC'ing SLI, possible PSU issue?

post #1 of 3
Thread Starter 
So, heres my dilemma. I'm running Matrix 580's in SLI along with an i5 at 4.6Ghz, pretty much a normal overclock. My power supply is a corsair AX1200.

Problem is, if I get much over 700watts at the wall my system destabilizes, sometimes the graphics driver will crash and other times it will be the motherboard restarting claiming the OC can't be applied. Or it will just lock up altogether and not give me a clue as to why. I'm using one of the little plug-through watt meters to tell me this, so its not super-accurate but it does show problems at the same wattage each time (my old Antec HCP1200 could get to 1000w through the same outlet).

Both of my cards will go well past 1000mhz, I made it to 1050 on one and 1035 on the other perfectly stable, but when I combine them I can't get past a wall at 980mhz (and again, that magical 700 watt number keeps coming up)

Reasons for suspicion of PSU: It SCREAMS. Literally, the more GPU load I put on it the louder it gets, running SLI at 950mhz it sounds like a teapot and makes screeching/hissing noises. I've checked in at the corsair forums and they seem to have had a batch of AX1200's that made noise but didn't seem to cause any issues so I decided to see if I could live with it.

Am I off base here? I'm considering an RMA on the PSU just to see if it helps, I originally selected an overkill PSU because I will be using it when I upgrade to socket 2011 and possibly adding another graphics card so I wanted it to be viable for a few years.
post #2 of 3
you may want to test it plugging the PSU directly into the outlet with the setting that make it unstable just to ensure that it is not something with the wall meter. The Screaming is likely due to a fan issue in the PSU like something scraping the blades. Another cause though highly unlikely if there is something scraping the fan blades it is certainly slowing down the fan, possibly the PSU thinks the fan is too slow and tries to throttle back output in the same way that the processor will throttle itself if it gets too hot. That being said if with the power meter removed it still doesn't work I would get an RMA.
Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
  hide details  
Reply
Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
  hide details  
Reply
post #3 of 3
Thread Starter 
Quote:
Originally Posted by DSP1 View Post
you may want to test it plugging the PSU directly into the outlet with the setting that make it unstable just to ensure that it is not something with the wall meter. The Screaming is likely due to a fan issue in the PSU like something scraping the blades. Another cause though highly unlikely if there is something scraping the fan blades it is certainly slowing down the fan, possibly the PSU thinks the fan is too slow and tries to throttle back output in the same way that the processor will throttle itself if it gets too hot. That being said if with the power meter removed it still doesn't work I would get an RMA.
I don't normally use the meter, it came out as a troubleshooting tool. It definitely NOT a fan issue at all, the fan is silent as can be (fan issue would also be present at all times that the fan is running, not ONLY when loads are applied to the 12v rail by the GPU's)

I guess I'll start an RMA and see what happens.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: NVIDIA
Overclock.net › Forums › Graphics Cards › NVIDIA › OC'ing SLI, possible PSU issue?