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Very weird possible overclocking bug

post #1 of 8
Thread Starter 
Essentially, if I increase my memory OC by even 1Mhz I lose performance.

3DMark11 Graphics Test 4 P @ 1080p score with the core at 1200Mhz and vRAM at stock: 18.24-18.18fps
Same test with core at 1.2 and memory at 1245Mhz (5Mhz underclock): 18.22fps
Same test with core at 1.2 and memory at 1251mhz (1Mhz overclock): 17.69fps
Same test with core at 1.2 and memory at 1255Mhz (5Mhz overclock): 17.84fps

It stays around 17.8*fps until eventually crashing with coloured artifacts all over the screens I have plugged into the card, I'm thinking the GDDR5 on this card either barely passed QC or there's some software bug here at fault. TPU got 1775Mhz on the same model of card. I'm guessing I have Elpida chips (Not sure, not really wanting to take apart my PC to check) but I still should be able to get even a little further than stock on it at least, I'd hope.


Edit: Tested stock core, various memory clocks in OCCT and the highest I tested (1475Mhz) was fine...definite software issue.
Edited by Brutuz - 10/6/13 at 7:09pm
    
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post #2 of 8
Might be a fabrication issue. Or maybe it's one of those GPUs that ''don't overclock well''.
Is your software updated? When did you last reinstall your operating system? You'd be amazed by the errors and crashed I get if I don't reinstall my OS....
post #3 of 8
Thread Starter 
I think it might have been the power saving features or something, I updated to 13.11 and disabled it and now can hit 1475Mhz easily.
    
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post #4 of 8
Just asking ... did you increase the power limit?
Ayase Eli
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Ayase Eli
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post #5 of 8
Thread Starter 
Of course.
    
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CoolingOSMonitorMonitor
Arcitc Cooling Acclero Twin Turbo II Arch Linux x86-64, amdgpu BenQ G2220HD BenQ G2020HD 
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Ducky Shine III Year of the Snake, Cherry Blue Silverstone Strider Plus 600w CoolerMaster CM690 II Black and White SteelSeries Sensei Professional 
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post #6 of 8
Answer is simple. Even GDDR5 memory has CAS latency. There are some frequencies where you have to set longer CAS/other latency (this can be done automatically). Once you cross it, performance of memory is decreased due prolonged access times, and gets better as you increase frequency further.

Other possible explanation is that memory is perfectly synced with other part of graphic card. In this situations memory can also provide better performance.
post #7 of 8
Quote:
Originally Posted by Offler View Post

Answer is simple. Even GDDR5 memory has CAS latency. There are some frequencies where you have to set longer CAS/other latency (this can be done automatically). Once you cross it, performance of memory is decreased due prolonged access times, and gets better as you increase frequency further.

Other possible explanation is that memory is perfectly synced with other part of graphic card. In this situations memory can also provide better performance.
Or simply ECC getting out of hand (GDDR5 has ECC)
Once too many errors occur ECC will spiral out of control and start having to take more time to correct errors
Ayase Eli
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ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 replacing the deepc... Dell U2713HM 
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Ayase Eli
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Hard DriveHard DriveHard DriveCooling
Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm Deepcool Captain 240 (waiting for AM4 bracket) 
CoolingCoolingCoolingMonitor
ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 replacing the deepc... Dell U2713HM 
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by Offler View Post

Answer is simple. Even GDDR5 memory has CAS latency. There are some frequencies where you have to set longer CAS/other latency (this can be done automatically). Once you cross it, performance of memory is decreased due prolonged access times, and gets better as you increase frequency further.

Other possible explanation is that memory is perfectly synced with other part of graphic card. In this situations memory can also provide better performance.

Reinstalling drivers, going to AB Beta 3.0 and just tweaking with settings fixed it, I think it was more a software bug in Afterburner or something.
    
CPUMotherboardGraphicsRAM
Intel Core i5 3570k @ 4.4Ghz ASRock Z77 Pro3 Powercolor Radeon HD7950 3GB @ 1150/1350 4x4GB G.Skill Ares 1866Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 250GB Western Digital Black 1TB WD1002FAEX Seagate Barracuda 3TB ST3000DM001 Samsung Spinpoint EcoGreen 2TB 
Optical DriveCoolingCoolingCooling
Pioneer DVR-220LBKS Noctua NH-D14 Scythe Gentle Typhoon 1850rpm Corsair AF140 Quiet Edition 
CoolingOSMonitorMonitor
Arcitc Cooling Acclero Twin Turbo II Arch Linux x86-64, amdgpu BenQ G2220HD BenQ G2020HD 
KeyboardPowerCaseMouse
Ducky Shine III Year of the Snake, Cherry Blue Silverstone Strider Plus 600w CoolerMaster CM690 II Black and White SteelSeries Sensei Professional 
Mouse PadAudioOther
Artisan Hien Mid Japan Black Large ASUS Xonar DX NZXT Sentry Mesh 30w Fan Controller 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel Core i5 3570k @ 4.4Ghz ASRock Z77 Pro3 Powercolor Radeon HD7950 3GB @ 1150/1350 4x4GB G.Skill Ares 1866Mhz CL9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 250GB Western Digital Black 1TB WD1002FAEX Seagate Barracuda 3TB ST3000DM001 Samsung Spinpoint EcoGreen 2TB 
Optical DriveCoolingCoolingCooling
Pioneer DVR-220LBKS Noctua NH-D14 Scythe Gentle Typhoon 1850rpm Corsair AF140 Quiet Edition 
CoolingOSMonitorMonitor
Arcitc Cooling Acclero Twin Turbo II Arch Linux x86-64, amdgpu BenQ G2220HD BenQ G2020HD 
KeyboardPowerCaseMouse
Ducky Shine III Year of the Snake, Cherry Blue Silverstone Strider Plus 600w CoolerMaster CM690 II Black and White SteelSeries Sensei Professional 
Mouse PadAudioOther
Artisan Hien Mid Japan Black Large ASUS Xonar DX NZXT Sentry Mesh 30w Fan Controller 
  hide details  
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