HD6850/HD6870 Overclocking thread

Lonyo

Lifer
Aug 10, 2002
21,939
6
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Figured I would make a thread for people who have overclocked their HD6800 cards.
Plus as and when we get better tools (e.g. voltage control) it might be useful.

Model: Sapphire HD6850 (regular)
Stock speeds: 775/1000
Overclock: 850/1055
Tool(s): CCC
Voltage: Stock (Unknown)
Fan: Auto

Not pushed it beyond any of those settings. Seems stable enough in games.

MSI Afterburner
http://event.msi.com/vga/afterburner/download.htm

Sapphire Trixx (Coming soon)
http://www.sapphiretech.com/ssc/TriXX/

GPU-Z
http://www.techpowerup.com/gpuz/
 
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Arsynic

Senior member
Jun 22, 2004
410
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I'm having issues with the 10.10c driver and seeing higher o/c settings in CCC. What's up with that?
 

WaTaGuMp

Lifer
May 10, 2001
21,207
2,506
126
Asus sixty eight fitty
900/1100
CCC Overdrive
Voltage Stock
Fan @ 50% manual
 

Lonyo

Lifer
Aug 10, 2002
21,939
6
81
I'm having issues with the 10.10c driver and seeing higher o/c settings in CCC. What's up with that?

I'm on 10.10b and seeing 850/1200, but downloading 10.10c to see if that does more than 850, since other people seem to have higher limits than me (like you and WaTaGuMp)
 

Arsynic

Senior member
Jun 22, 2004
410
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0
No, I'm saying that I'm not seeing higher O/C settings after 10.10c. I thought it opened up higher OC settings.
 

Lonyo

Lifer
Aug 10, 2002
21,939
6
81
No, I'm saying that I'm not seeing higher O/C settings after 10.10c. I thought it opened up higher OC settings.

Oh, my bad. Didn't understand. Yeah, did nothing for me either, 10.10b to 10.10c I'm still at 850/1200.

What model/manufacturer is your card?
 
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Arkadrel

Diamond Member
Oct 19, 2010
3,681
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*IF* the max on CCC is 850mhz (caps out option wise), try a differnt program to set speeds with. Like the MSI afterburner or something simular.
 

WaTaGuMp

Lifer
May 10, 2001
21,207
2,506
126
*IF* the max on CCC is 850mhz (caps out option wise), try a differnt program to set speeds with. Like the MSI afterburner or something simular.

Pretty sure they already know that. I think its more of a they want to know why certain people cant get over 850 in the CCC. I had Afterburner already downloaded figuring I was going to need it.
 

deepinya

Golden Member
Jan 29, 2003
1,873
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Will you get 6870 performance with an o/c'd 6850? Or are there more differences than just the clock speeds?
 

happy medium

Lifer
Jun 8, 2003
14,387
480
126
Will you get 6870 performance with an o/c'd 6850? Or are there more differences than just the clock speeds?

You need about 1150 on the core to = a 5870.:( pretty impossible.
Even a 6870 @ 972 cant beat a 5870.

Edit:sorry I read 5870. Yes a 6850 @ 1010 core = a 6870


HD6800-OC-56.jpg
 
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blastingcap

Diamond Member
Sep 16, 2010
6,654
5
76
Will you get 6870 performance with an o/c'd 6850? Or are there more differences than just the clock speeds?

6870 has more SPs. 1120 vs. 960. So it's not just clockspeed difference. VRAM speed is also different@stock but I think they use the same chips so you can oc them equally, in theory.
 

Xzyrus

Junior Member
Sep 25, 2010
22
0
0
CCC won't do over 850MHz. Afterburner will if you enable unofficial overclocking in MSIAfterburner.cfg in your C:\Program Files (x86)\MSI Afterburner folder or where ever you installed it.

I'm sitting at 930/1080 and it seems relatively stable. Some random game benches, 3DMark06, and 20 mins of Furmark didn't give me problems. 950 had some artifacts and 940 crashed my display drivers.
 

Borealis7

Platinum Member
Oct 19, 2006
2,914
205
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can people who O/C also post a sample benchmark with before and after results to see the gains? thanks.
 

Arkadrel

Diamond Member
Oct 19, 2010
3,681
2
0
Bumped my OC up a bit, still stock voltage, now at 950/1140


benchmarks :) pics or it didnt happend (jk) but would be nice.
Getting a 6850 to 950 core stable... pretty darn nice overclock there.
How much volt do you need to give it to reach 1ghz?
 

WaTaGuMp

Lifer
May 10, 2001
21,207
2,506
126
benchmarks :) pics or it didnt happend (jk) but would be nice.
Getting a 6850 to 950 core stable... pretty darn nice overclock there.
How much volt do you need to give it to reach 1ghz?

I ran Unigine right above a few posts. Bumping it up didn't change enough to warrant putting another benchmark up. I gained 1 FPS, min stayed the same and gained about 3 FPS on the max. I don't plan on trying for 1k since I don't want to add voltage.
 

MangoX

Senior member
Feb 13, 2001
555
43
91
Very nice OC there WaTaGuMp. I'm aiming for an Asus 6850 as well for my new build, but they're never in stock.