underclock/overclock

i checked but couldnt find any threads on how to underclock or overclock a ati 5870. im kinda a noob haha so if anyone could help thatd be great.

 

Just use the AMD GPU clock tool. Seriously dude, I did a quick search for "overclock underclock 5870" and it came up with tons of hits including a guide over at the Clevo forum.

techPowerUp! :: Download AMD GPU Clock Tool v0.7

http://forum.notebookreview.com/sager-clevo/480530-guide-how-underclock-your-ati-5870-automatically.html

 

when i ionstalled the first one it said no valid devices found... i kow i have a 5870

 

nvmm got it working... but is this right? once again im a noob.

 

Yeah its right. You have underclocked the core by 500Mhz, from 700 to 200.
Cheers, you are no more a noob

 

woo! haha now how would i go about underclocking a cpu....

 

My Mobility 5870 runs at 100/100 @0,85V in power saving mode. The stock clocks for this power settings were 200/1000 @0,95V. This change gave me additional 45-50mins of battery life for my MS-1727 (GX740) - a 17inch monster with a Core-i7 and a HDD and SSD. Don't be afraid to experiment. Just keep in mind to have Your PSU connected to Your laptop ( never do BIOS or vBIOS mods or updates on battery!) and always back up Your default BIOS and vBIOS before update or any changes.

I also managed to lower the voltage for the GPU (from 1,15V to 1,03V) and overclock it at the same time (from 700MHz stock to 800MHz). Everything runs perfectly stable, the temperature drop was MASSIVE!.

 

Which program do you use to flash the vbios ?

 

I've read about someone telling that his undervolting had no effect on temperature, so are some card "undervolt-resistant" or do you think he just did it wrong ?

In your case how did you undervolt ? Did you just under volt a bit and enough, or did you bench after each step ?

(PS: I really like your heatsinks ^^ )=> http://forum.notebookreview.com/msi/457412-msi-gx740-5870-1gb-ddr5-116.html#post6396434

 

I believe "whoever" told you that did not attend high school. Its basic physics, Resistance is directly proportional to Voltage. And resistance creates heat in IC(integrated circuits).
If voltage drops so does resistance and so does heat.

Its called Physics

 

No I know all that but what I tried to say is that he did the undervolt but it didn't have any effect in his temperatures, and when he checked the voltage get back to the normal

 

Dunno if that's possible? I think you can undervolt though, if the bios allows it.

 

Its easy through setfsb or even RMClock. Just force the lowest multipliers and they would have real low voltage so it would give around 30-45 mins extra battery time, and <65*C always

 

Really? What's the process, and how effective is this with regard to temperatures?

 

The Undervolting Guide
Have a nice reading!

 

Ah, does underclocking CPU = undervolting? Or is this simply the method for doing it?

 

No, they are two different things. But there is a lot of effort until you find you lowest stable voltage. You can simply read a few first pages and see what values have others used and set the same.
The CPU underclocks itself according to its usage. In order to find your lowest stable voltage you need to keep it at its default frequency and see is it stable at that voltage (In the thread there are stated programs that you can use to do the tests.). If it is, then you continue to lower the voltage and make the same test for stability. You repeat this step until you get BSoD (don't worry you can't wreck your laptop), when that happen you set your CPU voltage to the previous stable value you get before BSoD. In simple word that's it.