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275 Underclocking!

post #1 of 10
Thread Starter 
I am having all manner of trouble and I can't seem to figure it out!

So, I got a BFG GTX275OC video card off ebay. AWESOME card. With overclocking I was able to surpass the 460 (stock) 3D Mark Vantage scores with ease! I loved it! So much so I decided to buy another one and SLI. Well, the second one came in. I noticed it had a different PCB color (blue instead of black), but I was like, well alright, and put it in as a single card for testing. That's where things went downhill.

The blue 275 has been... problematic. Whenever I ran a game with the black 275s settings (743 core 1605 shader and 1282 memory) it would instantly underclock to 400mhz core and 600mhz shader. Just totally killed it. It took me a while to find overclock settings that would make it through 3dmark vantage, (740core 1550shader and 1282 memory), and then fired up a game. Underclocked again, but not instantly, took some time to underclock, but still did in in like 15 minutes or so. Flashed the bios to an older version (same as the black 275)? Underclocked again, but took a little longer again. Figured out the "nvidia power savings mode", setting it to maximum performance? Lasted even longer, but still underclocks (takes about an hour). Driver update? (258 to 266) No effect.

It seems to run just fine at these settings. Why is it underclocking? And how do I stop it? ANY clock setting above the OC's default will make it underclock eventually. Is this just a dud card? It seems like it's not the card's fault as it runs great (until it underclocks). And there is never any signs of artifacts at the overclock settings, and heat is well managed. (I use custom fan settings to keep it under 70C). It is acting like something in the card is going "I'm going to underclock now for no reason" and just does it! It makes no sense! This thing has been driving me CRAZY! I have everything I need to sli the black and the blue 275s together, but I want to fix the underclocking before I go into SLI goodness. Please help!

Note that I haven't messed with voltages. I'm not really sure how. None of the programs I have used have access to it's voltages, and I have seen that one can change it via bios flashing, but I have no idea what to change it to, or what it can handle.


System specs (for testing only using the blue (newer) 275, only one GPU for now)
Core 2 Duo e6750 @ 3.2ghz
BFG gtx275 OC with 896MB of vram
4GB DDR2 Memory
Antec TruPower Trio 750w PSU



UPDATE: Tried the "prevent 200 series from underclocking" thread. http://www.overclock.net/nvidia/4238...nclocking.html
It works, sortof. The card still tries to overclock (shown by a split second freeze) but then keeps going at the overclock, rivatuner's little tweak forcing it to stay at the overclock despite what the card demands. So it's not a solution, just a workaround. I would much prefer a way to keep it from underclocking period.
Edited by MaJoRoesch - 2/17/11 at 6:10am
The Black Ivy
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The Black Ivy
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post #2 of 10
It sounds like overheating to me, but necessarily GPU overheating. When OCing, aside from the GPU you also force the VRM. As such it may be the VRMs that overheat, or an overcurrent protection that kicks in. If you can, while testing check out the temp of the VRM and try to find out from the web if your card has an overcurrent protection.
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post #3 of 10
The GPU can't handle the OC you gave it. I've known this ******* problem for a looong time...

Lower your OC and stress test repeatedly. The reason it downclocks is because the Driver crashes and drops your card to 3D Low Power. Unless you Disable->Enable your GPU or Restart your computer altogether, it'll stay @ 400/297.
post #4 of 10
your GPU is getting to hot maybe the fan is not spinning 100%
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post #5 of 10
Thread Starter 
The GPU is not getting hot. I keep it under 70C and monitor it on my secondary monitor.

As for it not being able to handle the overclock, ANY overclock above stock BFG OC settings causes this problem. But the original (Black) BFG 275 OC was able to handle overclocks amazingly well.
The Black Ivy
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The Black Ivy
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CoolingOSMonitorMonitor
Zalman CNPS9900MAX-B Windows 7 x64 Gateway VX1120 Asus V242H 
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post #6 of 10
Quote:
Originally Posted by MaJoRoesch View Post
The GPU is not getting hot. I keep it under 70C and monitor it on my secondary monitor.

As for it not being able to handle the overclock, ANY overclock above stock BFG OC settings causes this problem. But the original (Black) BFG 275 OC was able to handle overclocks amazingly well.
I know what the problem is. Don't let the Blue PCB 275 (Gigabyte? Sparkle?) get over it's stock shader clock. Whenever I OC one of my cards' shader, even by 10MHz, it causes horrible driver crashes leading to 3D Low Power clocks.

Try OCing the rest except for the shader and let me know how it works out.
post #7 of 10
Thread Starter 
Both GPUs are BFG 275 OCs. I got the second one because of how awesome the first one was, but sadly the blue BFG 275 OC (the second one) has been a bit of a disappointment.
The Black Ivy
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CoolingOSMonitorMonitor
Zalman CNPS9900MAX-B Windows 7 x64 Gateway VX1120 Asus V242H 
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Antec TruPower Trio 750W Raidmax Blackstorm Logitech MX1000 Sound Blaster Audigy LE 
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The Black Ivy
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CPUMotherboardGraphicsRAM
Core i5 3570K Asus P8Z77-V LX Geforce 275 GTX @ 740mhz Crucial Ballistax DDR3-1600 (2x4GB) 
CoolingOSMonitorMonitor
Zalman CNPS9900MAX-B Windows 7 x64 Gateway VX1120 Asus V242H 
PowerCaseMouseAudio
Antec TruPower Trio 750W Raidmax Blackstorm Logitech MX1000 Sound Blaster Audigy LE 
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post #8 of 10
Quote:
Originally Posted by MaJoRoesch View Post
Both GPUs are BFG 275 OCs. I got the second one because of how awesome the first one was, but sadly the blue BFG 275 OC (the second one) has been a bit of a disappointment.
Alright. Try keeping the shader @ stock and OCing the rest anyway.
post #9 of 10
Thread Starter 
It won't let me do much of an overclock to the core without the shader clock being brought up. 720mhz is the highest the core will go with default shader speed.
The Black Ivy
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i5 3570K Asus P8Z77-V LX Geforce 275 GTX @ 740mhz Crucial Ballistax DDR3-1600 (2x4GB) 
CoolingOSMonitorMonitor
Zalman CNPS9900MAX-B Windows 7 x64 Gateway VX1120 Asus V242H 
PowerCaseMouseAudio
Antec TruPower Trio 750W Raidmax Blackstorm Logitech MX1000 Sound Blaster Audigy LE 
Other
ATI TV Wonder HD750 
  hide details  
Reply
The Black Ivy
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i5 3570K Asus P8Z77-V LX Geforce 275 GTX @ 740mhz Crucial Ballistax DDR3-1600 (2x4GB) 
CoolingOSMonitorMonitor
Zalman CNPS9900MAX-B Windows 7 x64 Gateway VX1120 Asus V242H 
PowerCaseMouseAudio
Antec TruPower Trio 750W Raidmax Blackstorm Logitech MX1000 Sound Blaster Audigy LE 
Other
ATI TV Wonder HD750 
  hide details  
Reply
post #10 of 10
Quote:
Originally Posted by MaJoRoesch View Post
It won't let me do much of an overclock to the core without the shader clock being brought up. 720mhz is the highest the core will go with default shader speed.
This is all you can do I suppose
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