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New to OCing Video Cards- need some advice

post #1 of 5
Thread Starter 
Hey guys, I'm new to overclocking video cards, so I was wondering if you could answer some of my questions. (I'm gonna overclock the card in my sig rig btw).

So i downloaded MSI Afterburner + Kombustor and tried increasing some clock values, but I don't really know what I'm supposed to look for in Kombustor as far as stability goes. Am I supposed to sit here and just wait until something goes wrong, or will the application tell me if something is unstable? If I am supposed to monitor it myself, what exactly constitutes "instability"?

I also read somewhere that ATI Tool scans for artifacts, so I was wondering if it would be safe to download that and use it to test for stability while still using Afterburner to do the actual overclocking.

Thanks in advance!
post #2 of 5
Run a game, they are the best (imo) way to tell if your OC is stable.
What you're looking for in kombustor is "artificating" or abnormalities in the picture. Also, you may GSOD (grey screen of death) and have to restart or your video card driver may restart all of these tell you your oc isn't stable. Look for the same in gameplay, if you experience these with an overclocked video card, back the clock down a bit, or add some voltage.
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post #3 of 5
Thread Starter 
Are the artifacts blatantly obvious, or do I have to do some careful searching?
post #4 of 5
Your card stability is very connected to it's temperature.

When I had a single 5870 that was heavily overclocked, at 1.25v it would crash at exactly 72 degrees at 1000mhz core.
If I used more voltage, it was worse: the card would crash a little hotter, at 75, for example, but it would get to 75 much faster.

So it's basically about that, trying to find the sweet spot on voltages, like any CPU overclock, but also keeping a big eye on the temp monitor and fan speed.

My question back then was, how much would I sacrifice the quietness I love so much for a good overclock? Instead of running the fan like a turbine at 100% I bought an aftermarket cooler - fortunately you already have a great cooler on your card


Quote:
Originally Posted by moop View Post
Are the artifacts blatantly obvious, or do I have to do some careful searching?
Google for artifacts on 570s, or any 5XX GPU, they must look the same. but they can differ from card to card. Should be easy to notice. There is also some programs (forgot the names) that will automatically look for artifacts and beep or show you messages if they find artifacts.
The other symptoms are pretty obvious, like driver crashs, game crashs, GSODs, system reboot, etc


I just wrote all of the above and recently noticed you got a NVidia card - I wrote it all as if you had a 6970...
Anyways, hope it helps...
Edited by EduFurtado - 7/30/11 at 6:33pm
post #5 of 5
They can look like speckles or shards, dots, tears, rips so yes they should be fairly pronounced. But really they can all look different. Just keep an eye out for anything abnormal in your picture.

Hope that helps a bit...
Edited by Wheezo - 7/30/11 at 6:35pm
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Mecha |3lack
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Ol' Timer
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Littlefoot
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CPUMotherboardGraphicsRAM
Intel Xeon x5650 @ 3.80GHz 6c/12t Asus P6T Deluxe V2 16+2 Phase Sapphire NITRO+ RX470 4GB 12GB (3 x 4GB) Kingston Hyper X Fury 1.5v 1600mhz  
Hard DriveHard DriveHard DriveOptical Drive
Crucial BX200 240GB [OS] WD Caviar Black WD1001FALS 3 X WD Caviar Blue WD10EZEX  LG Super Writemaster 
CoolingOSMonitorMonitor
Xigmatek SD1283 Night Hawk [P/P] Windows 10 Home LG 24EA53V 24" LED IPS 1080p LG 42LY340C 42" LED HDTV 1080p 
MonitorKeyboardPowerCase
Samsung Syncmaster 2243SWX Nixeus Moda V2 MK-BN15 TKL Enermax Liberty ECO 620watt Fractal Design Define XL R2 
MouseMouse PadAudioAudio
Logitech G502 Proteus Core Ducky Flipper Extra R Asus Xonar DGx Sennheiser HD558 
AudioAudioAudioOther
Pioneer SX-315 700w Receiver  Klipsch Synergy B10 Speakers Audio-Technica ATR4750 Microphone NZXT LED Strip 2m - Blue 
Other
XBOX 360 USB Controller - White 
CPUMotherboardGraphicsRAM
Intel C2Q Q8300 @ 3.0GHz - 1.30v Asus P5K-VM mATX Sapphire HD7870 Ghz Dual-X 4 GB (2x2gb) GSkill DDR2 1066MHz + 2GB Hynix  
Hard DriveHard DriveHard DriveHard Drive
ADATA XPG SX900 128gb SSD [OS] WD10EZEX 1TB  WD Scoripo Black 320gb Segate Barracuda 7200.11 500gb 
Optical DriveCoolingOSMonitor
LG Super-Multi DVD/RW Coolermaster 775 HS /w shroud  Windows 10 Home LG 42LY340C 42" LED HDTV 1080p 
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Acer 19" Monitor 1600 x 900 Logitech G105 Antec VP450 450w 80+ Antec 900 Mid Tower 
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