The Radeon 7850 is an overclocking beast

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robbrechter

Junior Member
Jun 9, 2012
9
0
0
I've tried both the standard driver as well as drivers linked in a Reddit article on overlocking the 7850 (OpenCL1.2betadriversWindows.exe).

Temp according to Trixx hovers between 28 and 36 celsius. The Coolermaster CPU fan is right next to the card and there is zero cable/card obstruction in the case between the two front fans and the card. The Sapphire card itself has two fans. attached to it.
 

AlucardX

Senior member
May 20, 2000
647
0
76
Did you try Asus GPU Tweak v. 2.0.6.0?

If that doesn't help, you could try flashing to Asus TOP bios.
 

robbrechter

Junior Member
Jun 9, 2012
9
0
0
Yes, I'm using that version of GPU tweak.

I wasn't able to flash the TOP BIOS. I followed the instructions to the letter, but after flashing, my GPU will not give any picture while it's receiving power. I tried flashing two separate times and both times I had to disconnect power from the board, set BIOS to default to onboard video, and flash back. When set to onboard, Windows sees the card and gets drivers for it, so it isn't a matter of a bad flash.

I'm completely stumped and very frustrated at this point.
 

MisterMac

Senior member
Sep 16, 2011
777
0
0
Yes, I'm using that version of GPU tweak.

I wasn't able to flash the TOP BIOS. I followed the instructions to the letter, but after flashing, my GPU will not give any picture while it's receiving power. I tried flashing two separate times and both times I had to disconnect power from the board, set BIOS to default to onboard video, and flash back. When set to onboard, Windows sees the card and gets drivers for it, so it isn't a matter of a bad flash.

I'm completely stumped and very frustrated at this point.


Don't flash.

Why would flash make your card better?


Post your variables.
Complaining shit aint stable without clock \ mem frequency and voltages is futile.

Duds do exist.
Period.

I had an ASUS one, with a 1.21 mV stock volts that did the same as you more or less.
Perhaps a tad better.
 

robbrechter

Junior Member
Jun 9, 2012
9
0
0
I'm not trying to come off like I'm just complaining. I really just want to figure out what's wrong, even if it's some stupid user error.

Even at stock everything, GPU over 1000 makes screen go black until hard reset. That's stock voltage, too. If I top the (allowable) voltage out at 1225, still black as soon as I hit 1000. I can bump up the Memory Clock just fine with no issues.

If it will help, I can run a number of different settings and post how long it took to crash, but I have a decent grip on what's the problem, just can't figure out for the life of me how to fix it, aside from just buying a 7870 and getting the performance I'm after right out of the box, albeit for much more money.
 

SickBeast

Lifer
Jul 21, 2000
14,377
19
81
I've tried both the standard driver as well as drivers linked in a Reddit article on overlocking the 7850 (OpenCL1.2betadriversWindows.exe).

Temp according to Trixx hovers between 28 and 36 celsius. The Coolermaster CPU fan is right next to the card and there is zero cable/card obstruction in the case between the two front fans and the card. The Sapphire card itself has two fans. attached to it.
28 and 36C at idle or under load?

Check your load temps at stock speeds.

I find it really hard to believe that you got such a dud.

Can you check your ASIC quality in GPU-Z? You click at the top left of the window to do it.

Do you know what voltage you're at?
 

robbrechter

Junior Member
Jun 9, 2012
9
0
0
ASIC Quality: 69.1%

Trixx: GPU Clock 860 / Mem Clock 1200 / VDCC 1210

32C while running HD video full screen.
 

SickBeast

Lifer
Jul 21, 2000
14,377
19
81
We need your load temps during gaming. Use the Asus GPU Tweak and just check it once you leave the game.
 

Kastor Krieg

Member
Jun 10, 2012
66
0
0
Hey guys, first post

I'm looking to upgrade from my GAINWARD GTX 460 1GB Golden Sample (84% ASIC), which clocked top at 900/1800/2000 (1.050v) and works when I game at 860/1780/2000 (1.025v). The reason I'm moving on is that I game BF3 and ARMA2 most and I will game ARMA3 when it comes out. I need something more powerful, with more VRAM for all those textures and AA and I'm definitely not afraid to overclock, so here comes the 7850.

I got an eye on the Sapphire OC ones, but there seem to be two versions (look in "Opis produktu"):
http://www.agito.pl/karta-graficzna-sapphire-radeon-hd-7850-oc-2gb-ddr5-pci-e-box-84-556971.html
http://www.agito.pl/karta-graficzna-sapphire-radeon-hd-7850-oc-2gb-ddr5-pci-e-fbox-84-569527.html

Unless I missed something, they are only different by their model number - 11200-01-20G and 11200-01-40G. Is that a "rev1" and "rev2" version? Does one of these have better binned chips? My Google-fu is weak, so I thought I'd ask here, since I already had a blast reading the whole thing and seeing how this beast overclocks

My other specs are a i5-2500k @ 4.6Ghz, 8GB RAM, Corsair TX 650W, asrock extreme4 p67 b3 and a 22" 1680x1050 screen (which is exactly why I'm not even looking towards the more powerful cards and want to OC this little thing to ~1200).

Any help will be appreciated and thanks for a very informative read so far!
 

SickBeast

Lifer
Jul 21, 2000
14,377
19
81
I can't read Polish so those links aren't helpful.

I don't think there are two revisions though. I hear good things about the Sapphire cards, but I personally think that the Asus DC2 cards are the best.
 

SickBeast

Lifer
Jul 21, 2000
14,377
19
81
52C for Skyrim with HD Textures and various other graphics add-ons while running in Ultra setting.
So your temps are good.

*shrug*

You have a terrible ASIC quality; I suppose it *is* possible that you just got a really bad overclocker.

Even still, with more volts you should do ok.

My ASIC is 73% which is barely higher than yours and I can hit 1240mhz.
 

Kastor Krieg

Member
Jun 10, 2012
66
0
0
No need to read Polish, Sick Beast. It just says "Producer's code:", the rest are the specs, which are pretty obvious. The clocks are the same, amount of VRAM is the same, both are on a 6-pin connector, the "newer one" is like $15 more expensive.

I was obviously curious if you guys knew if they broke or fixed anything with the apparent review.
 

Kastor Krieg

Member
Jun 10, 2012
66
0
0
Just found out a good hint:
http://www.sapphireforum.com/showthread.php?28545-The-Difference-is

11200-01-20G and 11200-01-40G = OC versions
11200-00-20G and 11200-00-40G = non-OC versions, with the same cooling system (probably weaker ASIC bins though)

Makes me wonder if the "40G" ones aren't better samples of the same batch or something like that. Ideas?

EDIT:
Three strikes and out, it seems. NOW do I come across a Google query that takes me where I wanted to go, lol. Apparently, the 20G is a "Lite" version, 40G is "Full". It's the exact same hardware, but the "lite" box contains less stuff - fewer cables, no Crossfire bridge, so on. The shop listing comparison confirms it. I'll go for the 40G OC edition, will get back to you guys when I manage to get my hands on it and OC a bit

Cheers!
 
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Bryson777

Member
Nov 26, 2008
59
0
0
Trying to OC an asus 7850. I can do 1100/1375 on stock volts. Asic Quality 79.7%

Anything higher has been a real chore and i'm not sure what to do. Using GPU tweak to change voltage to 1200/1375 @ 1.185v like Don posted caused my computer to black screen hard lock and made my GPU fan speed run at 100% which scared the crap out of me the first time. The only way I can get a run of heaven 3.0 is by using trixx @ +20 board power, 1.3v, 50% fan speed and I'm still getting artifacting like crazy. Hit 74c at load with case open

I turned off overdrive in CC so that it wouldn't conflict. is that ok?

Could drivers be affecting overclock? Running latest 12.6

Also running Antec Neo HE 430w and a q6600@3.0ghz

What do you guys suggest? Should I stick with max OC at stock voltage or try to hit max OC?
 

Gordon Freemen

Golden Member
May 24, 2012
1,068
0
0
Trying to OC an asus 7850. I can do 1100/1375 on stock volts. Asic Quality 79.7%
Anything higher has been a real chore and i'm not sure what to do. Using GPU tweak to change voltage to 1200/1375 @ 1.185v like Don posted caused my computer to black screen hard lock and made my GPU fan speed run at 100% which scared the crap out of me the first time. The only way I can get a run of heaven 3.0 is by using trixx @ +20 board power, 1.3v, 50% fan speed and I'm still getting artifacting like crazy. Hit 74c at load with case open. I turned off overdrive in CC so that it wouldn't conflict. is that ok? Could drivers be affecting overclock? Running latest 12.6. Also running Antec Neo HE 430w and a q6600@3.0ghz. What do you guys suggest? Should I stick with max OC at stock voltage or try to hit max OC? [/QUOTE

If you wanted a faster card you should have bought a faster card.
 

Kastor Krieg

Member
Jun 10, 2012
66
0
0
@Gordon
Reported and blacklisted.

I don't want a faster card, I am just trying to get the most out of the card that I have! Why don't you just leave. Nobody likes you here! Seriously...take a hint man.
Easy, man. Don't take it personally, he's only a troll.

As far as your question goes, did you increase the voltages incrementally, or just made a single "leap"? It's best to take it slow, bump the volts a bit, then try to raise the core. ~1150 is very decent OC already and from what I've read so far here, you should not really go beyond 1.2 - 1.25v mate. Watch out.
 

Bryson777

Member
Nov 26, 2008
59
0
0
Easy, man. Don't take it personally, he's only a troll.

I know but he's completely unhelpful and he trolls all of the amd threads. What's it going to take for mods to take action?

I'm fed up of trying to overclock and having my pc keep crashing so I am going to play some STALKER and try again later. Just thought of something. I want to try OC with the memory at stock. Might be that it doesn't like to be OC.
 

3DVagabond

Lifer
Aug 10, 2009
11,951
204
106
Trying to OC an asus 7850. I can do 1100/1375 on stock volts. Asic Quality 79.7%

Anything higher has been a real chore and i'm not sure what to do. Using GPU tweak to change voltage to 1200/1375 @ 1.185v like Don posted caused my computer to black screen hard lock and made my GPU fan speed run at 100% which scared the crap out of me the first time. The only way I can get a run of heaven 3.0 is by using trixx @ +20 board power, 1.3v, 50% fan speed and I'm still getting artifacting like crazy. Hit 74c at load with case open

I turned off overdrive in CC so that it wouldn't conflict. is that ok?

Could drivers be affecting overclock? Running latest 12.6

Also running Antec Neo HE 430w and a q6600@3.0ghz

What do you guys suggest? Should I stick with max OC at stock voltage or try to hit max OC?

I'm concerned that your PSU could be holding you back. A Q6600 isn't exactly energy efficient, by today's standards, and while the 7850 is very efficient, you can defeat that by dumping large amounts of voltage into it. I'd probably be happy with whatever it does at stock volts and leave it at that.

Also some O/C'ing programs themselves cause driver conflicts that can lead to instability. I've read numerous posts where Afterburner has caused conflicts, for example. Sometimes trying a different utility can give you better results.
 

Kastor Krieg

Member
Jun 10, 2012
66
0
0
I know but he's completely unhelpful and he trolls all of the amd threads.
I think he trolls all the threads in this sections, just gave a quick browse and he's everywhere, talking out if his hindparts to agitate people, all the time.

What's it going to take for mods to take action?
No clue, I'm new to the board, but I hope we're pretty close to them saying "enough is enough". Otherwise, just ignore him, report his posts and then put him on the blacklist.

I'm fed up of trying to overclock and having my pc keep crashing so I am going to play some STALKER and try again later. Just thought of something. I want to try OC with the memory at stock. Might be that it doesn't like to be OC.
Could be anything, but it seems like a good idea. If you are able to unlink the shaders, too, try that. Just the core, then shaders, then mem, if you really need to.

Whats ASIC mean?
It seems to be the "electrical leakage quality", or basically, how much the power distributed in the chip is used in compliance with the manufacturer's "ideal gold standard". Poor cards have 45-60%, great ones have 80-90% (like my Golden Sample GAINWARD), amazing ones can even slightly exceed 100% (which means that they are more power-effective than designed and expected). The power loss is mostly dissipated as heat (but don't ask me for details, I'm just a humanities major, lol).

In any case, it apparently can be used to tell if a card is likely to OC well or not. Not a foolproof method, but a decent one (there are many more factors, but power efficiency is a major one). Also, apparently, card producers "bin" chips by the value itself. The 40-60% ones are most likely to be found in the regular reference editions of the cards - good stuff, but most of the time stuck with a reference cooler. Not much potential for OC there.

The better ones are selected for "golden sample", "OC" and such editions of the cards, most of them with specially designed cooling systems like Phantoms Direct CU II, Twin Frozr III or Windforce, to name a few. Those are clocked higher by defaults and you can expect to OC them even further. The best ones are the ones I'd expect to find in "SOC Super Oveclock" or "Goes Like Hell" editions, where default clocks exceed stock ones by far and the limit to which you can push those cards is only found on huge aftermarket air or water cooling.

However, you can also find poor ones in the "OC" editions, and great or even amazing ones in the "regular bin". That's why people keep saying it's the luck of the draw.

This is about what I gathered from the 'net. Apologies for any imprecision, I'm new to the term myself. Hope I helped :thumbsup:
 
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robbrechter

Junior Member
Jun 9, 2012
9
0
0
So your temps are good.

*shrug*

You have a terrible ASIC quality; I suppose it *is* possible that you just got a really bad overclocker.

Even still, with more volts you should do ok.

My ASIC is 73% which is barely higher than yours and I can hit 1240mhz.

Started having a lot of video problems at stock everything. Think card is faulty. Going to RMA it. Now need to decide if I get same card or just buy something different.

Thanks for your help, it's much appreciated.
 

SickBeast

Lifer
Jul 21, 2000
14,377
19
81
Started having a lot of video problems at stock everything. Think card is faulty. Going to RMA it. Now need to decide if I get same card or just buy something different.

Thanks for your help, it's much appreciated.
You're welcome.

The 7850 is well worth the money. If you can get the Asus DC2 version I say go for it.
 
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