How to overclock a 7850 past 1050MHz?

Winky_The_Winking_Turtle · 5 Jun 2013 at 18:05

Core clock is currently at 1120 and stable. Had this card for nearly a year now and it's been great. Gonna try pushing it some more, hopefully up to 1200 when I get some more fans.

battleponcho · 5 Jun 2013 at 22:29

PC shop had a clearance sale on these heat sinks so I snagged a pack for 3$ to try placing them on my pcb along with repasting the chip.
The VRM's on the board do have a metal plate that goes across them as you can see in the picture to provide cooling. It would be optimal to the heatsinks directly on the VRM's but figured it wouldn't do any harm to place em on the plate.

GDDR5 vram chips don't really get hot to begin with but figured to cover them up as well. I did run into a clearance issue with 3 of them so I had some spare heatsinks which I later just placed elsewhere (using 5 instead of 4 on the VRM plate) and on another chip.

I ran some stability test, impressed with the drop in idle and load temps and that noticed one chip in particular (the one circled in yellow) would get REALLY hot. So I opened it back up and placed a spare heatsink ontop of it as well. Strangely enough temps improved AGAIN. This might be more so to do with maybe the gpu cooler being applied tigher or different than before that affected temps but it was damn perfect before. I don't know how or if it did change the load temp by placing it but it must help regardless, given how hot that chip was getting.

Can anyone shed light on which chip controller it is?

I used playing Metro Last Light and Chivalry as benchmarks.

Chivalry used default clocks 920/1250 @ 1.075v. I know from many hours of gaming it will peak at 58-60c. This has been changed to 47-49c. A drop of ~10c.

Metro used my stable overclock setting of 1100/1350 @ 1.170v. It would peak around 77-80c. It now stays peaks at 65-68c.

I haven't tried out tweaking around voltage now if I require less than before to help temps or OC the core but i'll be sure to try it out now.

[EDIT] I've since managed to peel off the vrm plate using a thin blade off my pen knife

arekgreenman888 · 20 Jun 2013 at 14:15

Slapped this on today: Arctic Accelero Twin Turbo II VGA Cooler

and peak temps droped from 70 C to 58 C. and noise halfed.

3D MARK 11 went from:

GPU 1150/1250

Score
P6627 3DMarks

Graphics Score
6345

Physics Score
8360

Combined Score
6779

TO:
gpu 1200/1250

P7657

Graphics Score
7514
Physics Score
8224
Combined Score
7976

Quiet a jump by 1000 points. Am happy!

Andygully · 23 Jun 2013 at 10:57

so what's the best 7850 to buy so i wouldn't have to swap out the coolers? would be looking to crossfire them

arekgreenman888 · 24 Jun 2013 at 22:10

Andygully said:
so what's the best 7850 to buy so i wouldn't have to swap out the coolers? would be looking to crossfire them

Dont know if its possible to XFire with 2x Arctic Accelero Twin Turbo II VGA Cooler on top of 7850. But it runes nicely cool and quiet.

LtSkitzo · 25 Jun 2013 at 10:24

Modding for best results

I just wanted to come and say hello to all in this thread and thankyou, got a lot of information from this and managed to get a very nice OC on my 7850. In fact I still have a lot of room to breath, thanks to my custom modded version

See Pic below

Uploaded with ImageShack.us

Hoping to get to 1300mhz, stable and cool. Currently running at 1250 by 5800, at 54C full load

LtMatt · 25 Jun 2013 at 11:56

Green heatsinks? Awesome.

arekgreenman888 · 25 Jun 2013 at 19:56

LtSkitzo loving those green heatsinks. Am cruising comfy on 1050/1250 stock vlots... temps no going over 65C full load... idle around 40 C...

Johnnytoxic · 9 Jul 2013 at 19:25

My Sapphire 7850 is not in a case and has a PCI riser cable so it's currently standing up.

I use it for hash cracking so memory overclock is not important

1190 mv
1350mhz Core
1250mhz Memory

Card is 68oc on this very hot 25 degree day. My room is baking as I'm in a flat.

GazEaton · 14 Jul 2013 at 13:12

im having a problem with the asus GPU Tweak software, i cant seem to find the GPU Voltage adjustor?

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delta0 · 2 Aug 2013 at 22:20

Mine is running well at OC speeds for about a year now 1200/1450. Well worth getting an OC edition.

Fr4nc · 17 Aug 2013 at 21:31

My stock and OC result of my SAPPHIRE 7850 2GB!

3DMARK 11 - Performance
ALL STOCK
score: P5849
GPU score: 5762
CPU score: 6289
Combined score: 5900
link: http://www.3dmark.com/3dm11/6840748

OC'ed (CPU@4718MHz, GPU@1260/1500)
score: P8169 (+39,66%)
GPU score: 8178 (+41,93%)
CPU score: 8466 (+34,62%)
Combined score: 7709 (+30,66%)
http://www.3dmark.com/3dm11/6939432

Greetings from SLOVENIA,
Fr4nc

owens2000 · 19 Aug 2013 at 07:38

Fr4nc said:
My stock and OC result of my SAPPHIRE 7850 2GB!

3DMARK 11 - Performance
ALL STOCK
score: P5849
GPU score: 5762
CPU score: 6289
Combined score: 5900
link: http://www.3dmark.com/3dm11/6840748

OC'ed (CPU@4718MHz, GPU@1260/1500)
score: P8169 (+39,66%)
GPU score: 8178 (+41,93%)
CPU score: 8466 (+34,62%)
Combined score: 7709 (+30,66%)
http://www.3dmark.com/3dm11/6939432

Greetings from SLOVENIA,
Fr4nc

Hi Fr4nc.

I have the same card.
Can I ask what settings you've used ?

Fr4nc · 19 Aug 2013 at 07:51

owens2000 said:
Hi Fr4nc.

I have the same card.
Can I ask what settings you've used ?

Which settings?

You mean this: "CPU@4718MHz, GPU@1260/1500"?
Voltage of GPU is 1.225V and that's all

Greetings,
Fr4nc

Bagpu55 · 22 Aug 2013 at 21:57

Hello all, thought I would add my 2GB Sapphire has been running well OC for over a year but I have managed to keep my volts down (or some would say push harder

Not taken it higher than this.

GPU 1200Mhz, mem 5400 Volts 1.155.
I have just run 3dmark 11 on performance and score combined 7700.

Dizzlepro · 24 Aug 2013 at 12:17

im looking to go crossfire soon, does any one have any crossfire benchmarks with the new 13.8 drivers?

tuffluck · 30 Aug 2013 at 16:33

delta0 said:
Mine is running well at OC speeds for about a year now 1200/1450. Well worth getting an OC edition.

I don't have the OC version, but the Sapphire version and I have had mine OC'd for over a year at the same speeds no problem. I actually just went from 12.10 drivers to 13.4. 12.10 were rock solid for me, but we'll see how the 13.4 hold up.

delta0 · 30 Aug 2013 at 20:44

tuffluck said:
I don't have the OC version, but the Sapphire version and I have had mine OC'd for over a year at the same speeds no problem. I actually just went from 12.10 drivers to 13.4. 12.10 were rock solid for me, but we'll see how the 13.4 hold up.

That's good. Generally OC editions tend to clock higher, but yours is testament that it is not always the case. Checked with Heaven that the error checking is not kicking in too much?

David Bisset · 1 Sep 2013 at 12:14

Hey guys, just looking at OCing my 7850 a bit more and have removed CCC and installed Asus GPU Tweak.

I've enabled Overclocking Range Enhancement (set slider to 1100, works like a charm) but to go much further I think I'll need to play with voltage. However, there is no voltage option that I can see

is mine voltage-locked or am I doing something wrong?

tuffluck · 3 Sep 2013 at 17:33

delta0 said:
That's good. Generally OC editions tend to clock higher, but yours is testament that it is not always the case. Checked with Heaven that the error checking is not kicking in too much?

I actually have the Sapphire OC edition, I forgot.

Is anyone having issues with 13.4 drivers? For some reason everything after 12.10 crashes for me.