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How to overclock a 7850 past 1050MHz?

Sapphire 7850 OC

Hi guys, there's bucket loads of good information here, yet I want to make sure I'm heading down the right path before I dip my feet into overclocking:

I just got my Sapphire 7850 OC (920/5,000) installed an hour ago and ran a 20 minute Heaven Benchmark using agreed upon settings: stock clocks.

00000jy.jpg
Shot at 2012-04-21

I've downloaded the following:
(1)Asus GPU tweak tool, latest version
(2)Unigine Heaven 3.0
(3)3DMark11
(4)GPU-Z,latest build

There seems to be no agreed up, or hard/fast rule when it comes to overclocking increments, but is the following method ok?

(1) raise core clock by 10 mhz between tests at same voltage?
(2) when artifacts and/or crashing occurs in Heaven benchmark, raise voltage. Yet, by how much?
(3) how long should I be running each attempt for?
(4) watch temperatures with GPU-Z?

thanks,
Jason
 
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Jason3022 said:
There seems to be no agreed up, or hard/fast rule when it comes to overclocking increments, but is the following method ok?

(1) raise core clock by 10 mhz between tests at same voltage?
(2) when artifacts and/or crashing occurs in Heaven benchmark, raise voltage. Yet, by how much?
(3) how long should I be running each attempt for?
(4) watch temperatures with GPU-Z?

thanks,
Jason
Click to expand...

I was increasing by 20MHz increments earlier today, post is at the top of this page. I was doing that so that it wouldn't take all day to overclock. I dropped down to smaller increment for the last push.

I incremented by 0.01v when I encountered vpu recover on a run.

I can't say how long you should leave it running, but I just did one 'suicide run' in heaven and moved on :).
If you want to test stability then you should leave Heaven looping overnight, but I would only do that when you have settled on your 24/7 overclock, not whilst you're testing the limits of the card.

I would say to start at stock voltage and see how far it goes first. Normally you can push to 1050/5800 on stock voltage, which is the maximum limit of the CCC by default for these cards.
 
two00lbwaster said:
I was increasing by 20MHz increments earlier today, post is at the top of this page. I was doing that so that it wouldn't take all day to overclock. I dropped down to smaller increment for the last push.

I incremented by 0.01v when I encountered vpu recover on a run.

I can't say how long you should leave it running, but I just did one 'suicide run' in heaven and moved on :).
If you want to test stability then you should leave Heaven looping overnight, but I would only do that when you have settled on your 24/7 overclock, not whilst you're testing the limits of the card.

I would say to start at stock voltage and see how far it goes first. Normally you can push to 1050/5800 on stock voltage, which is the maximum limit of the CCC by default for these cards.
Click to expand...

Thanks for the tips, that should gear me in the right direction.
I'm having a minor glitch at the moment though; error 1607 when I'm trying to install Asus GPU tweak. I'll have to figure out why it won't install first.
Sorry, what's a 'suicide run'; pushing excess of limits?
 
Jason3022 said:
Thanks for the tips, that should gear me in the right direction.
I'm having a minor glitch at the moment though; error 1607 when I'm trying to install Asus GPU tweak. I'll have to figure out why it won't install first.
Sorry, what's a 'suicide run'; pushing excess of limits?
Click to expand...

Suicide run refers to getting hardware to run long enough for you to carry out your aim without regard for stability or the long term health of the hardware. Top end Overclockers will burn out or scorch hardware trying to break records, which is where the term comes from.

Good luck with getting gpu tweak installed anew your overclocking efforts.
 
Skip straight to 1050 core as I don't think there has been anyone yet that couldn't do that on stock volts, and then work up from there. Good luck! :D
 
Ok, after a reboot I got Asus GPU tweak installed.

I'll have a go @ the 1050 core on stock voltage. If that works, then I'll bump by increments of 20Mhz on the core, then by 10MHz if I approach say 1150. What about Memory clock, I noticed you left yours at 5,000 MHz throughout your testing?
 
ZardoZ said:
Would these be better than existing 7850's for overclocking?

http://www.overclockers.co.uk/showproduct.php?prodid=GX-157-MS&groupid=701&catid=56&subcat=411
Click to expand...

I think if you change the question to 'would the cooling be better on this than existing 7850's?' the answer would appear to be yes. I'm not an expert and I havent ever overclocked anything but I am going to be ordering a 7850 in the next few days (probably this one) so I've been trying to research everything I can. From what I've learnt overclocking is never guaranteed but one thing that is important in order to overclock is keeping temps down. I'd say anything that helps do that would certainly give you the best chance.

Like i said, I'm no expert and I'd wait for a reply from someone here more knowledgeable than me but i hope this helps!
 
anyone running the sapphire 7850 oc card? whats it like? id like 7970 but i think its just a bit overkill,currently running a 5870
 
3D mark GPU score vs memory overclock.

6226 1100/5200
6245 1100/5300
6313 1100/5400
6312 1100/5450
6323 1100/5500
6227 1100/5600
6298 1100/5700
6307 1100/5800

I'm keeping it at 5400 for now. Interesting how the score goes down after 5500.

My GPU sucks a bit for overclocking. I'm at 1100 using 1130 and it still isn't rock solid stable. Still plenty fast though!
 
HeX said:
Skip straight to 1050 core as I don't think there has been anyone yet that couldn't do that on stock volts, and then work up from there. Good luck! :D
Click to expand...

+1 for this :)

ZardoZ said:
Would these be better than existing 7850's for overclocking?

http://www.overclockers.co.uk/showproduct.php?prodid=GX-157-MS&groupid=701&catid=56&subcat=411
Click to expand...

It'll keep it cooler sure, which is good in the long run as you have to live with whatever overclock you choose, and so the fan speeds that that will require.

As to whether the other improvements will help, who knows? You'd have to compare a bunch of stock cards against a bunch of these cards. Or if it were possible, you'd need to take a GPU core from a stock card and stick it into one of those cards and see if it performs any better.

Pants said:
3D mark GPU score vs memory overclock.

6226 1100/5200
6245 1100/5300
6313 1100/5400
6312 1100/5450
6323 1100/5500
6227 1100/5600
6298 1100/5700
6307 1100/5800

I'm keeping it at 5400 for now. Interesting how the score goes down after 5500.

My GPU sucks a bit for overclocking. I'm at 1100 using 1130 and it still isn't rock solid stable. Still plenty fast though!
Click to expand...

Good work on the benching your memory to find its maximum. It's something that I still need to do to find the sweet spot. I know that 6000 is out of the question, however, this 5800 seems okay. Need some hard figures though.
 
Sapphire 7850 oc preliminary results:

Asus GPU Tweak / Heaven 3.0. / GPU-Z

So far I'm focusing only on the core clock.

Default (920/5,000)

On my 29th overclock, I've found the following:

1200/5000/1.170 without crashing @ 73 degrees, auto fan.
I'll let Heaven run overnight to be sure 1200 is stable.

In the meantime, how do I go about overclocking the memory clock? Should I set the core clock and voltage back to default and run the process again but only upping the memory clock this time? And then slap the 2 together after I find the memory clock ideal setting?

Any suggestions would be great.
 
@Jason3022

I have a Sapphire 7850 OC too and I am pretty sure if you set gpu at 1200, Volts at 1.176 and memory at 5800 you will find it passes heaven and of course pretty much any game you through at it.

In fact I have had this card testing for a week and I am not the only one on here with this particular card that needs exactly 1.176 volts for 1200/5800.

Let us know how you get on.

On a side note: I have had nothing but trouble with the new MSI AB. Causing lockups almost seconds after each boot. Think I will stick with GPUTweak for the time being.
 
Jason3022 said:
In the meantime, how do I go about overclocking the memory clock? Should I set the core clock and voltage back to default and run the process again but only upping the memory clock this time? And then slap the 2 together after I find the memory clock ideal setting?

Any suggestions would be great.
Click to expand...

Hi Jason,

I would set the core back and find your max memory limit. I would then scale back a little and scale up incrementally. Sticking the two together might work, but then it might not and you'll have to scale back to find the limits, I'd scale back a little on both and see how it progresses, that way you can see if performance is regressing.
 
i also have the sapphire oc edition. i hit 1200 last night at 1.18, didn't try 1.176, though i bet i can get there.

have to admit, 1150 @ 1.135 is way more tempting. after that point to increase the core you have to dramatically increase voltage. seems a bit excessive to me. thoughts?
 
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