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overclocking 6950 questions

post #1 of 3
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I just bought a spahire 6950 and i was over clocking it using trixx. i just wanted to know of some good aftermarket coolers that will keep my GPU from over heating
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post #2 of 3
I would start with removing the heatsink and replacing the thermal paste with something good like TX-4, MX-3, OCZ Freeze, Gelid GC-E, Shin Etsu x23 ect.

Unless your heatsink is incredibly loud and you can't live with the noise, don't bother with after market coolers. Unless you are water cooling, you will just be spending a lot of time and money to gain a very small amount of performance IE: You won't be lowering your temps very much at all.

The act of cleaning your stock heatsink and re-applying some high grade thermal paste will net you the best results and that will take you a lot less time and a lot less money. I would say 75% of the temp decreases from aftermarket air coolers is from just replacing the stock thermal paste.

GPUs are pushed a lot harder than CPUs by the factories. They are already running pretty hot and you won't be able to increase performance much my ocing. When you get them out of the box this is the way you can increase performance:

Overclock - 10%-15% max without any mods. Give or take

Replace Stock Thermal Paste + Overclock - 15%-20%

Aftermarket heatsinks can sometimes RAISE your temps. At best you will only get a little bit more performance with a very good aftermarket cooler. Some people choose to customize aftermarket coolers and this can net you better temps, but still not that much. If new TIM will lower your temps by 10c and new TIM plus an aftermarket heatsink will lower your temps by 11c, why spend 50 bucks for that 1c? It sounds to me like like that 1c won't matter much for you.

Unless you are WC, don't bother buyng another heatsink. If you really want to lower temps, start by replacing the thermal paste.

If you can do that right and you still aren't satisfied, then I say come back and ask.

Use 91% Iso alcohol and coffee filters to clean the paste off. Then apply a small amount of the good stuff on your stock heatsink. Boom better temps.
Edited by Ktulu - 1/23/11 at 2:40am
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post #3 of 3
Quote:
Originally Posted by Ktulu View Post
Unless your heatsink is incredibly loud and you can't live with the noise, don't bother with after market coolers. Unless you are water cooling, you will just be spending a lot of time and money to gain a very small amount of performance IE: You won't be lowering your temps very much at all.

The act of cleaning your stock heatsink and re-applying some high grade thermal paste will net you the best results and that will take you a lot less time and a lot less money. I would say 75% of the temp decreases from aftermarket air coolers is from just replacing the stock thermal paste.

GPUs are pushed a lot harder than CPUs by the factories. They are already running pretty hot and you won't be able to increase performance much my ocing. When you get them out of the box this is the way you can increase performance:

Overclock - 10%-15% max without any mods. Give or take

Replace Stock Thermal Paste + Overclock - 15%-20%

Aftermarket heatsinks can sometimes RAISE your temps. At best you will only get a little bit more performance with a very good aftermarket cooler. Some people choose to customize aftermarket coolers and this can net you better temps, but still not that much. If new TIM will lower your temps by 10c and new TIM plus an aftermarket heatsink will lower your temps by 11c, why spend 50 bucks for that 1c? It sounds to me like like that 1c won't matter much for you.
Sounds like you're lumping all aftermarket coolers in an unjustified manner here. While a TIM increase does make a difference, some aftermarket air coolers actually do offer better temps and less noise (Accelero Xtreme Plus being one of the most prevalent, plenty of reviews showing how excellent it is in terms of cooling/noise reduction).

And on what experience do you have to base your conclusions anyway? I'm curious myself. Performance increases per card depends on the binning process though, some can OC to great lengths, but in the case of the 6950, probably nothing that high due to Cayman's architecture, at least in comparison to relative OC performance of the GTX 580 or 570's. Even on water, I figure some people can only push it so far and require so much voltage that the gain at higher levels of OC is negligible at best.

To the Op, I'd recommend the Accelero Xtreme Plus cooler if you're willing to throw the money for it (get the VRAM sinks too) and enough space in the case to fit the dang thing on. Stock can keep it cooled decently, but it does get pretty loud even with a fan profile that you would set up.
Edited by yoshi245 - 1/23/11 at 3:28am
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Main
(14 items)
 
  
CPUMotherboardGraphicsRAM
2500k ASROCK P67 Extreme 4 Gen3 Sapphire 7950 Dual X 8GB GSkill Ripjaws@8-9-8-23 1600 
Hard DriveOptical DriveCoolingOS
GSKILL Phoenix Pro 120gb SSD, 3x 1.5TB hdd, 2tb Samsung 24x dvd-rw Thermalright Silver Arrow with 3 TY-140 fans Win7 X64 
MonitorKeyboardPowerCase
Sharp 40" Aquos LCD TV as main monitor 2 ASUS 2... Thermaltake TT eSports Meka G1 Corsair TX750 HAF 932 
MouseMouse Pad
G400 Artisan Hien VE L Samurai Black 
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