4870 Overclocking Thread

[dejanh]

Thanks, i downloaded the latests version and it runs, is strange cause the version i had run withe the previous 4870...

Well, later ill post the tests but, what fan speed do you want? normally i use 35%.

Well, whatever you think is a bearable fan speed in terms of noise. 100% is not bearable as it sounds like a jet. However, it would be useful to see it at 100% as well just to get a better idea.

[Unrealer]

Well, whatever you think is a bearable fan speed in terms of noise. 100% is not bearable as it sounds like a jet. However, it would be useful to see it at 100% as well just to get a better idea.

Ok, ill try 40% and 100%...

[Unrealer]

I tried 830/4200 with 40% but furmark crashes after 20seconds or less i show 150º on VRM and a red led appeared on the card, i rebooted but it didnt turn off



Ill try again with stock speed & 40%...

idle temps @ 250/1000 @ 20%:




EDIT: with stock speeds @ 40% i show 140º easily furmark crashes after 1 minute and the red led appeared again (it only turn off when i power off the PC )

I dont take a screenshot but i recorded a video:

http://files.filefront.com/MOV09449M.../fileinfo.html

[xMrBunglex]

thanks for the help. no need to test further if you don't want. your VRM's get as hot as ours do.

[Shogan]

GPU was idle here, and clocks were 795/1100. I will do a run with furmark 100% load and upload my screenshot here. I was monitoring remotely via RDP from work, so I couldn't run any 3D tests at the time, as a limitation to RDP.

GPU is under an EK 4870 full cover block.

[Unrealer]

830/4200, 35% playing Crysis:

[xMrBunglex]

830/4200, 35% playing Crysis:

wow. i think your VRM's actually get hotter than mine.

[Unrealer]

wow. i think your VRM's actually get hotter than mine.

What fan speed do u use?

[xMrBunglex]

What fan speed do u use?

i use a custom profile similar to the one on the Asus Top BIOS. it's usually at 30% on desktop and around 40% in games.

[Xcel]

I tried 830/4200 with 40% but furmark crashes after 20seconds or less i show 150º on VRM and a red led appeared on the card, i rebooted but it didnt turn off

What, that seems ridiculous, 20s?

I've ran Furmark at 820/1020 for 30m and temps don't go above 92c core, 131c vrm at stock fan settings.

@42%-50% (it keeps switching all the time) it's 81c core and 105c VRMs. (custom fan profile in ATT)

This is with cats 8.7

[dejanh]

What, that seems ridiculous, 20s?

I've ran Furmark at 820/1020 for 30m and temps don't go above 92c core, 131c vrm at stock fan settings.

@42%-50% (it keeps switching all the time) it's 81c core and 105c VRMs. (custom fan profile in ATT)

This is with cats 8.7

Um you might want to not run FurMark for so long if your VRMs get that hot. Max safe operating temp is 125C Around 50% fan on stock cooling the temps get much better. I had the same thing happen. Granted IMHO 105C is still too hot.

[0ut0fstep]

Damn VRM's wish I had some milling equipment i would just design a cooler for the back half of the card. It wouldnt be that hard. suprised some manufacturer hasnt jumped on the band wagon yet lots of people( I know I would) would buy a cooler for the back side of the card if it worked and was available.

[anzial]

So, 4870 is having problems with overheating?

[xMrBunglex]

So, 4870 is having problems with overheating?

only with Furmark and the 8.7 driver. right now it's only a theoretical problem. we don't know if it will ever be a real issue in any real 3D app or not.

[Xcel]

Well IMO something is definetly wrong with a card that can only run furmark for 20s or less.

[anzial]

I've only just installed 4870, installed windows and noticed how loud the fan is... annoying, really, esp. when compared to my venerable 8800gts, and also considering that I have an overall quiet case... Hmm, well, I'll give it a whirl and if I don't like it, Fry's will take it back

[0ut0fstep]

Well IMO something is definetly wrong with a card that can only run furmark for 20s or less.

This problem is pretty random. Its not "every card" that is having a VRM overheating issue. my visionteks can run furmark all day long sure they break 100c but they are not crashing, and all other 3d stress test programs that use 100% GPU usage arent causing the vrm's to cap out either. so we dont have a valid reason why furmark is causing this.

[xMrBunglex]

I've only just installed 4870, installed windows and noticed how loud the fan is... annoying, really, esp. when compared to my venerable 8800gts, and also considering that I have an overall quiet case... Hmm, well, I'll give it a whirl and if I don't like it, Fry's will take it back

what model did you get? the reference 4870 is whisper quiet unless you mess with the stock fan settings.

[MomijiTMO]

So I gather the backside of the card gets hot but what can you whack a heatsink on? I guess we could just run a fan over it.

[dejanh]

This problem is pretty random. Its not "every card" that is having a VRM overheating issue. my visionteks can run furmark all day long sure they break 100c but they are not crashing, and all other 3d stress test programs that use 100% GPU usage arent causing the vrm's to cap out either. so we dont have a valid reason why furmark is causing this.

I did not find an app yet that causes near or at 100% utilization on the GPU other than FurMark. Everything else from what I have observed seems to be < 90%, peak maybe closer to 100% but only for a split second.

[Xcel]

This problem is pretty random. Its not "every card" that is having a VRM overheating issue. my visionteks can run furmark all day long sure they break 100c but they are not crashing, and all other 3d stress test programs that use 100% GPU usage arent causing the vrm's to cap out either. so we dont have a valid reason why furmark is causing this.

My point was maybe his card is faulty, bad contact perhaps

[dnottis]

I didnt know an OC thread existed. Here is mine, game stable, Furmark stable..

Here is 900 core, no vmods, just flashed with Asus TOP bios.

[F.stop]

wow, very nice c dnottis
the best ive seen so far. which card vendor was that
furmark stable too......

[dnottis]

Asus.

[Boyu]