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Underclocking AMD Overdrive?

Z

ZodaEX

Supreme [H]ardness
Joined
Sep 17, 2004
Messages
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If I want to lower the temps on my AMD card can I simply lower the MHZ in AMD overdrive to achieve this, or is it more involved than that? Whats the cleanest way to do this without running extra software all the time in the background?
 
Simplest thing you can do? Change the "Power Control" slider in AMD Overdrive from 0 to -20.

This reduces the maximum amount of power the card is allowed to draw, which will lead to lower load power consumption and temperature at the cost of performance.
 
A better solution is to install MSI Afterburner and just decrease the core voltage as low as possible while still remaining stable. Reducing clockspeeds reduces performance, reducing voltage doesn't (unless you go too low and become unstable). Once you apply settings in Afterburner you can close the program and they'll stay like that until you reboot.
 
Unknown-One said:
Simplest thing you can do? Change the "Power Control" slider in AMD Overdrive from 0 to -20.

This reduces the maximum amount of power the card is allowed to draw, which will lead to lower load power consumption and temperature at the cost of performance.
Click to expand...

Awesome, that's exactly what I want to do, thanks a ton!
 
I use CCC presets to underclock my GPU clock and memory speeds when I'm not gaming. I haven't tried reducing voltage, but I'm sure that's achievable in the CCC presets as well. Simply enable Overdrive, then drag the sliders where you want them, then create a preset and hotkey it.

I have presets for heavy gaming (OC with high fan speed), moderate gaming (stock clocks, moderate fan speed), no gaming (2D clocks), and cool-down (2D clocks with high fan speed).
 
Hmm, so I lowered the "power control" slider down to -20%, however my load temps are exactly the same at 103 degrees. I guess that feature isn't working yet or something? Is 103 Celsius hot enough to be concerned about at all? I don't think i've ever had a videocard run this hot before.
 
ZodaEX said:
Hmm, so I lowered the "power control" slider down to -20%, however my load temps are exactly the same at 103 degrees. I guess that feature isn't working yet or something? Is 103 Celsius hot enough to be concerned about at all? I don't think i've ever had a videocard run this hot before.
Click to expand...
Yes, that is hot enough to be concerned with. Sounds like your card is bad or your case has no airflow, or you live in Hades .
 
What card do you have? When is it running at 100 degrees? Are your fans at 100% at this stage? You're not really giving us enough info to work with here.
 
Gumbi10 said:
What card do you have? When is it running at 100 degrees? Are your fans at 100% at this stage? You're not really giving us enough info to work with here.
Click to expand...


Honestly the only info i'm looking for is how to underclock/undervolt my videocard cleanly so it doesn't have a ludicrous TDP like I was able to do in for my processor in 3 minutes by changing the multiplier. The power control appeared to do this, but changing the values didn't appear to do anything at all. My temps are the same as before I adjusted the slider.

-My new card is a HD7850
-it's running 103 during a furmark burn
-all my fans are at 100% except my CPU fan which is dialed down to 1800 RPM.
 
First of all, don't use Furmark, it's designed to rape cards. Something like Valley Benchmark is a much more realistic load. Having said that, 103 degrees is quite hot for it. What model 7850 is it?

Use MSI Afterburner to undervolt it.
 
Gumbi10 said:
Use MSI Afterburner to undervolt it.
Click to expand...

This tool also has a graph which visually logs your load, clock/mem speeds, temperature, and fan speed among other things. I'd use this to ensure your fan is even spinning up.

In my experience with CCC Overdrive, I've had to manually set my desired fan speed (e.g. 80%) otherwise the fan(/s) wouldn't spin up enough to keep the card cool during heavy gaming. If you're having a similar issue, I resolved this by first creating presets, then going into the CCC profile XML documents and editing them in Notepad+. I believe the profiles are the XML documents (identifiable by the profile name you enter in CCC) located in your %username%/AppData/Local/ATI directory.
 
Great, i'll look into MSI Afterburner later to try and keep the noise under control. For the time being I stuck one of those cheap 92mm fan PCI brackets from ebay right under the card and now it never gets over 81 degrees under a furry burn so I think i'm safe for now. Eventually the noise will drive me crazy but for now i'm just enjoying my cool 7850 :) .
 
I just lowered my mhz on the core and turned the fan to 100 and that lowered temps for me on my 7870. If you haven't already try taking the side panel off your case. It's ghetto I know, but during these hot summer days it's not a bad idea :)
 
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