How to overclock a 7850 past 1050MHz?

Jarrod · 17 Apr 2012 at 13:39

Why are you guys topping out at 70ish degrees when with only 1.15v running through two of them in crossfire, I'm reaching 94-95c?

It's not like my airflow is particularly bad, it isn't great but I have a decent push-pull config running. :s.

HeX · 17 Apr 2012 at 13:43

What version are your cards? are they right next to each other? CF cards are always about 10C hotter than running a single card.

pieman109 · 17 Apr 2012 at 13:44

Jarrod said:
Why are you guys topping out at 70ish degrees when with only 1.15v running through two of them in crossfire, I'm reaching 94-95c?

It's not like my airflow is particularly bad, it isn't great but I have a decent push-pull config running. :s.

have you tried upping the fan speed?

Jarrod · 17 Apr 2012 at 13:45

HeX said:
What version are your cards? are they right next to each other? CF cards are always about 10C hotter than running a single card.

I'm using the Powercolor reference 7850s. In a few mins of Heaven v3, they have a 2-3cm gap in between them. But even with 100% fan on both cards, they get extremely hot.

My 2500K @4.6Ghz tops out at 75 ish, if that comparison can help.

Twirlywoos · 17 Apr 2012 at 13:52

Question: Can I reduce my voltage even though it's high in comparison and overclock it?

FYI: My Card is Idle at 23 degrees and 58 degrees whilst running Uni.

HeX · 17 Apr 2012 at 14:01

Yeah I think ASUS is just picking the voltage up wrong, as you wouldn't be at 58C at 1.21V.

That's the kinda temps i'm getting at stock.

As I say, try setting voltage to 1.15V and core at 1150 and give it a go.

Twirlywoos · 17 Apr 2012 at 14:11

HeX said:
Yeah I think ASUS is just picking the voltage up wrong, as you wouldn't be at 58C at 1.21V.

That's the kinda temps i'm getting at stock.

As I say, try setting voltage to 1.15V and core at 1150 and give it a go.

Yeh it's weird. What programme should I use to record my temps so I can give you all an accurate result?. I hate it when people publish results with no screen shots

In order to give some credibility to mine I like to provide some, but Asus Tool after Uni has finished benching shows 59 degrees max. Hardware monitor shows 23 degrees at idle which is the same result in Asus GPU Tool.

Anyway I've rambled on enough lol, here are my next results after changing the voltage down only!

HeX · 17 Apr 2012 at 14:13

Need 4xAA and normal tess on

Just use ASUS Tweaks monitor to post your temps and whatnot.

pieman109 · 17 Apr 2012 at 14:18

Thought that score looked a bit high

Twirlywoos · 17 Apr 2012 at 14:28

HeX said:
Need 4xAA and normal tess on

Just use ASUS Tweaks monitor to post your temps and whatnot.

pieman109 · 17 Apr 2012 at 14:35

You still haven't got AA x 4 applied yet going by that screenie. In settings box, the box called "mode" should say 1920 x 1080 "AA x 4", not fullscreen. I think you might have applied AA in the CCC, but it needs to be selected in the Tweak tool. Make sure your CCC settings are showing, under AA options, "use application settings" this will allow to tweak tool to apply the correct amount of AA

Twirlywoos · 17 Apr 2012 at 14:36

pieman109 said:
You still haven't got AA x 4 applied yet going by that screenie. In settings box, the box called "mode" should say 1920 x 1080 "AA x 4", not fullscreen. I think you might have applied AA in the CCC, but it needs to be selected in the Tweak tool. Make sure your CCC settings are showing, under AA options, "use application settings" this will allow to tweak tool to apply the correct amount of AA

I haven't got ccc installed. I just realised after I posted the bench that I didn't apply it. I was going to delete the post but you already replied.

Updated Bench (Stock Speed Not OC Yet)

Twirlywoos · 17 Apr 2012 at 15:54

HeX said:
Rumours are rubbish. Everyone here is using cards with a single power connector.

My MSI does:

1200/5800 @ 1.15V
1225/5800 @ 1.17V
1290/5800 @ 1.225V

Hex what do those numbers equate to in the GPU Voltage box? I have 1075 in mine currently.

Am I correct in thinking it's 1150; 1170 and 1225?

HeX · 17 Apr 2012 at 16:00

Yup

But each card is different.

As I say try 1150mV and 1150Mhz core and see what happens, and work from there.

Twirlywoos · 17 Apr 2012 at 16:03

HeX said:
Yup But each card is different.

As I say try 1150mV and 1150Mhz core and see what happens, and work from there.

Thanks.

When I did 1200/5800 @ 1.15V (1150) It crashed Furmark so I'll start from those numbers.

Sui · 17 Apr 2012 at 16:11

Think I have quite a capable card

pieman109 · 17 Apr 2012 at 16:16

I'm wondering if some of these cards have got rejected (speed binned) 7870 chips in'em. Would make sense to me, any chips that don't make the grade as 7870 cards are downgraded in a batch to 7850 cards, but a high percentage of these chips must be ok to run at 7870 speeds, just like they speed bin cpu chips, and a lot end up as monster clockers sort of thing.
Opinions?

Sui · 17 Apr 2012 at 16:28

HeX what sort of temps were you getting at around the 1.17V mark? Just did 1240 at 1.16V but temp peaked at 70

Twirlywoos · 17 Apr 2012 at 16:48

what's an acceptable voltage maximum? mine just crashes in furmark constantly and I'm 1190 @ 1210V and still have no joy. I'm thinking maybe because my voltage was maxed out at the start that the card may be a bad overclocker.

Twirlywoos · 17 Apr 2012 at 16:54

Hex where did you get your card from? I know we can't name companies but we can drop clues.

Was it from the Rainforest site?