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How to overclock a 7850 past 1050MHz?

The latest Asus GPU Tweek 2.1.24 unlocks the voltage to begin at 1.21V. This is too high for my card and Heaven crashes immediately.

So far Sapphire Trixx is playing nice. My card seems to prefer memory clocks within the range of 5800-5900 as maximum. So I will test how far I can push the GPU clocks with a flashed Asus bios.

I'm not expecting much improvement, but it would be nice if I can hit 60 FPS in Heaven with Stability in games too.
 
Over Voltage Protection (OVP) does not seem to be an issue for these cards. I thought that I was suffering from OVP when I had a reference cooler (fps would choke anywhere above 1.2v), but it turns out that it was thermal throttling caused by the GPU getting too hot.

With my new cooler and the card at 1376MHz @ 1.3v there is no choking whatsoever. OVP and Thermal Throttling simply do not occur.

I played BF3 @ 1350MHz for 20mins last night and it seemed stable. I think 1325-1350MHz rock solid is achievable on 1.3v, but 1376 is just for benches. I completed one run of 3DMark11 @ 1400MHz and Heaven @ 1385, but they took 5 or 6 attemps and both are extremely far from being stable. I am sure >1400MHz is possible once I find away to give it more than 1.3v.

I have received a mail from a US guy offering $400 for my card. Apparently he wants to give it some extreme modding and cooling and be the first to hit 2GHz:). He thinks I must have a great piece of silicon.
 
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One thing that has been bugging me and nobody with a HIS card has been able to verify too is that there are only 2 heatpipes on the card instead of the advertised 4 which aids better cooling.

The box says 4

DSCN2176.jpg


But I have 2

DSCN2168.jpg

DSCN2167.jpg


What grounds do I have to get a refund based on this or for OCUK to send me one out with 4 heatpipes?
 
Assuming your default voltage is 1050 I would suggest increasing in steps of 0.025v and testing until it becomes stable.
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My stock voltage is actually 1038. Is there a certain number I should increase it by each time?
 
majnu said:
What grounds do I have to get a refund based on this or for OCUK to send me one out with 4 heatpipes?
Click to expand...
OcUK have a 2-week no quibble returns policy. Also, if you received the card within the past 10 days you are covered by DSR. So long as you received the card within this period just return it quoting DSR and request a full refund.
 
555BUK said:
OcUK have a 2-week no quibble returns policy. Also, if you received the card within the past 10 days you are covered by DSR. So long as you received the card within this period just return it quoting DSR and request a full refund.
Click to expand...

I've left a message on the customer service part of the forum attaching the pics, so I'll see what they have to say. Looks like a manufacturing fault as the pics clearly show the slots where the additional heatpipes should have gone.
 
majnu said:
I've left a message on the customer service part of the forum attaching the pics, so I'll see what they have to say. Looks like a manufacturing fault as the pics clearly show the slots where the additional heatpipes should have gone.
Click to expand...
It is not a manufacturing fault. HIS's website now state 2 heatpipes for the 7850. Within Gibbo's original Pre-Order thread I warned that these would only have two heatpipes, but I guess not everyone saw my post. Here is my original warning.
 
Jordeh said:
Mine has 2 heatpipes too majnu. Very strange.
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There was an initial delay with these cards due to a shortage of parts, so I can only assume that somewhere in the production process the extra pipes were missed. It has the recess cut out for the pipes and the channel where they go to the other heatsinks.
 
555BUK said:
It is not a manufacturing fault. HIS's website now state 2 heatpipes for the 7850. Within Gibbo's original Pre-Order thread I warned that these would only have two heatpipes, but I guess not everyone saw my post. Here is my original warning.
Click to expand...

No I didn't see it, but then a video review stated 4 heat pipes, HIS' site, aswell as OCUK stated 4. The product's own box shows 4, but it would be nice to get an official statement from HIS or OCUK to what's going on. :)
 
People having issues with ASUS GPU Tweak should try Sapphire Trixx. GPU Tweak has better monitoring, but Trix has much better fan control and it seems to "unlock" core speeds easier. I now prefer Trixx.
 
majnu said:
I've left a message on the customer service part of the forum attaching the pics, so I'll see what they have to say. Looks like a manufacturing fault as the pics clearly show the slots where the additional heatpipes should have gone.
Click to expand...

It's more likely an error on the packaging. They use the same boxes for 7850 and 7870 with some minor changes.

They will have two versions of the cooler, one with 2 pipes one with 4.

As the 7850 is a cool running card they will have used the 2 pipe version. The 7870 runs hotter so they will use the 4 pipe. And they probably forgot to change the packaging info.

http://www.hisdigital.com/us/product2-690.shtml

Only 2 pipes on the official page as well.
 
majnu said:
No I didn't see it, but then a video review stated 4 heat pipes, HIS' site, aswell as OCUK stated 4. The product's own box shows 4, but it would be nice to get an official statement from HIS or OCUK to what's going on. :)
Click to expand...

If the video is the same one I saw on youtube, then that card is the overclocked version. Its not the same one as was on offer. Although it did puzzle me as well when I received mine.
 
My cards default voltage is 1.050v.

edit: It was 1.050v but after flashing to ASUS BIOS it now shows as 1.075v. Different partners must tweak to different levels, so voltage may have nothing to do with silicon quality.
 
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Just ckecked some screenies of my original VTX reference card, and that was 1.050v.

So, I have had two cards (VTX & Powercolor), both reference, and both 1.050v. Perhaps voltage is set low because the reference coolers are not great. Maybe MSI, ASUS etc set it higher because their coolers handle heat better and because it makes them appear better out-of-box overclockers? One thing is certai, at 1.3v these cards rock:).
 
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