overclocking a 7870xt

Gibbo3771 · 26 Apr 2013 at 10:42

\o 8 Pack,

Got myself a 7870XT here, trying to overclock it.

I can get it to 1150/1650 before it starts to crumble, how would I go about pushing this higher?

8 Pack · 26 Apr 2013 at 11:29

Have you added volts?? Speeded up fans etc. This is the first point of call with these things.

Gibbo3771 · 26 Apr 2013 at 14:17

So far I have not touched the volts, what is my safest maximum? What software would you use? I am currently using overdrive but have afterburner as well.

I run the fan speeds @ 100% when overclocking and running FurMark.

After the speeds I said, I can keep increasing the clocks to around 1250/1700 and it remains stable but as soon as I do something, like open a tab, window etc etc, instantly grey screens and I need to reboot.

I would like to get somewhat close to the speeds you had on your review.

8 Pack · 26 Apr 2013 at 16:01

Use the software produced by the Brand of the card you bought if at all possible.

Full volts will be safe for Benchmark runs as these days the card manufacturers dont offer really high volts using regular versions of software. 1.2 is cool 24/7 if you use a decent fan profile.

Gibbo3771 · 26 Apr 2013 at 17:11

8 Pack said:
Use the software produced by the Brand of the card you bought if at all possible.

Full volts will be safe for Benchmark runs as these days the card manufacturers dont offer really high volts using regular versions of software. 1.2 is cool 24/7 if you use a decent fan profile.

Ah ok, well the brand is sapphire and I got the software on disc, will probably download a newer version though.

Will 1.2 allow me to achieve similar clock rates like in your review? or for that are you using insanely high volts that are unstable, mainly for benching purposes?

Gibbo3771 · 26 Apr 2013 at 17:28

Thought I would just update you.

Currently running my card @ 1200/1675, I presume the VDDC is the voltage that I can adjust, well it is the only option lol. Well anyways I went into Trixx and the VDDC was set to 11xx or something, I hit reset to just start from scratch and it change to 1256.

Is this the correct thing to change?

Googled it and apparently that is the memory voltage, not sure if Google is lying to me

8 Pack · 26 Apr 2013 at 17:40

nope thats VGPU on Trixx as far as I am aware.

Yes your doing the correct thing.

LtMatt · 26 Apr 2013 at 19:08

Hope im not stepping on your toes Mr 8pack but Gibbo3771 i've written a step by step guide to gpu overclocking with radeon cards here using afterburner.

http://forums.overclockers.co.uk/showthread.php?t=18431335

Gibbo3771 · 26 Apr 2013 at 23:10

LtMatt said:
Hope im not stepping on your toes Mr 8pack but Gibbo3771 i've written a step by step guide to gpu overclocking with radeon cards here using afterburner.

http://forums.overclockers.co.uk/showthread.php?t=18431335

Nice, however I think I might be voltage locked, MSI is not giving me the option to change voltage, the bar is there but grayed out.

Nvm, updated MSI AB.

LtMatt · 27 Apr 2013 at 08:57

Gibbo3771 said:
Nice, however I think I might be voltage locked, MSI is not giving me the option to change voltage, the bar is there but grayed out.

Nvm, updated MSI AB.

I cover all that in the guide how to check two different ways to see if your card is voltage locked.