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Old 4th Apr 2012, 09:10   #1
555BUK
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How to overclock a 7850 past 1050MHz?

I have just built a new system for a friend who wants me to get the max out of it. So far I have his 2500K @ 4.6GHz, but I am struggling to bypass the 1050MHz CCC limitation/bios for his 7850.

Even after removing CCC and enabling unofficial overclocking within the latest Afterburner Beta's I cannot raise the slider above 1050MHz. Card is a reference VTX 7850 which is perfectly stable at 1050core/5800mem, but I know that core can do more.

Any tips?

oh, and having played with the 7850 for a few hours I think it is a very decent card. When overclocked, it performs pretty close to my old GTX580 within most games. Even BF3 is playable at 1920x1200 on decent'ish settings. The 580 is better, but not by much.

edit: RESOLVED - See post #11 onwards for MONSTER 7850 overclocks (upto and beyhond 1275MHz GPU / 6000MHz mem stable).

GTX580 & 7950 performance has never been cheaper.


BF3 FRAPS test




Crossfire tests added 27/5/2012





another edit:

NOW 1350MHz Core Stable and benchable @ 1376-1400MHz!

The above requires a BIOS flash to unlock 1.3v (Instructions here). You also need very good cooling (I fitted an Accelero Twin Turbo II). Here and here are some benches @ 1376MHz core.
Last edited by 555BUK; 27th May 2012 at 21:06.
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Old 4th Apr 2012, 16:13   #2
CinderzFTW
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Sounds as though the card is not designed to go above 1050

Life is not worth living without my children.
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Old 4th Apr 2012, 16:43   #3
psychodil
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Have you tried trixx?
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Old 4th Apr 2012, 16:48   #4
HeX
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Are you on the 12.4 betas? The only way to bypass the limits atm is to use older drivers.

The reviews where they OC higher than 1050 are all using the launch driver 8.95.5

I'm stuck at 1050 as well until the apps get updated. Trixx doesn't even support 78XX's yet.

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Old 5th Apr 2012, 12:10   #5
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Although you still never fessed up and you probably think I'm a total pita, according to guru3D's 78series oc'ing article http://www.guru3d.com/article/radeon...rclock-guide/2 you need to enable unofficial oc'ing in AB:

'Breaking free from limitations

Should you need more then AMD's restricted the clock frequencies, then you will need software that can deal with that. AfterBurner can do so, but you'll need to follow these instructions. Now this tweak[see link below] disables AMD's Powertune. The results may be an instable graphics card. Really anything can happen. If you don't appreciate that, then overclocking is not for you.

The default limitations however should be more than plenty for overclocking, so we really do not advise disabling Powertune in the first place.

Anyway, we recommend you start off with a GPU core clock of 1100 MHz and work your way upwards. With each increase of say 25 MHz stress your GPU with a stringent application or game. A full 3Dmark 11 session would be a good indicator for stability.

We ended at 5800 MHz for the memory and a nice 1203 MHz on the GPU core (in combination with 40% fan RPM and thus a 1300 Mv voltage tweak).'

http://forums.guru3d.com/showthread.php?t=338906

'You need to alter the following:
Seek UnofficialOverclockingEULA field and add following text:
I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
Set UnofficialOverclockingMode to 1 to keep PowerPlay active (may not work on old ASICs), 2 to traditionally disable PowerPlay or to 0 to temporary disable unofficial overclocking path
Using the unofficial overclock method opens up more freedom in terms of voltages and clock ranges, it however also can open a can of worms in terms of stability or weird issues.

Unofficial means unsupported -- we grant some extra tweak options to fool around with, but in no way, manner or fashion is it supported by Guru3D.com or MSI.'

Hope it helps mate.


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Old 5th Apr 2012, 12:35   #6
HeX
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As I said, that doesn't work, I've tried it with MS AB Beta 14 and Beta 15, doesn't unlock anything (using 12.4 beta drivers).

Also I found Beta 15 to be VERY buggy, doesn't give fan readings, gpu usage, clock speeds etc. and attempting to unlock just bluescreens the system.

Beta 14 works fine, lets you OC and gives all the readouts correctly, but again won't unlock at all, it doesn't bluescreen, but it also doesn't unlock any voltage or clock limits.

You either have to use the launch drivers, or wait for Trixx/MS AB to get updated.

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Old 5th Apr 2012, 12:51   #7
555BUK
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Well, I still cannot get past the 1050MHz lock, but ASUS GPU Tweak allows voltage control and I can undervolt down to 0.99v and still maintain 1050MHz with complete stability. I think this card will do 1200MHz+, once software (Afterburner/Trixx) fully supports it.

AB b15 just locks up as soon as I open it.
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Old 5th Apr 2012, 12:55   #8
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Yup, i'm pretty certain mine will do around 1200 as well, just need them to get a working version of AB out! Dying to clock it further.

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Old 5th Apr 2012, 13:14   #9
dave_beast
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The core clock will be BIOS limited, so you'll need an unlocked BIOS to get higher clocks, or wait until AB supports higher clocks on 7850's.

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Old 5th Apr 2012, 13:28   #10
tommybhoy
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Bios flashing would be risky as it doesn't have the bios switch though.


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Old 5th Apr 2012, 13:45   #11
555BUK
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SUCCESS!

To overclock 7850's past 1050MHz you need ASUS GPU Tool (works with any manufacturer).

After install, go into Settings and tick the following boxes.
*GPU Voltage
*Overclocking range enhancement

GPU tool now opens up the clock ranges for my reference 7850 up to 1720MHz GPU and 9600MHz. Needless to say, don't try that high.

Here is a a piccy and Heaven bench at 1200MHz GPU / 5800MHz mem (2500K porcessor @ stock). This provides roughly stock 7950 performance for half of the price.



1200MHz is not the limit, just the first >1050MHz bench I have attempted.
Last edited by 555BUK; 5th Apr 2012 at 13:48.
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Old 5th Apr 2012, 14:04   #12
HeX
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Typical! I never tried the ASUS Tweak software because reviews said it was locked to ASUS hardware ID's.

That is so getting slapped on this evening

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Old 5th Apr 2012, 14:05   #13
555BUK
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Now running 1250/5800. Needs 1290MHz to reach the magic 50% overclock.
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Old 5th Apr 2012, 14:18   #14
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That's my target as well

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Old 5th Apr 2012, 14:22   #15
555BUK
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Looks like 1260/6000 is the max for me on stock cooling. 1290 fails on test 2-3 of Heaven, and I do not want to raise volts above 1.15v. At 1.15v 1260MHz is stable enough to loop Heaven.

Still, not bad for a GTX580/7950 matching 170 graphics card. A mere ~45% overclock just does not sound as good as 50% would.
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Old 5th Apr 2012, 14:25   #16
ALXAndy
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True but 45% is better than RMA

I reject your context, and substitute my own.
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Old 5th Apr 2012, 14:26   #17
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These are fine up to 1.3V, get some juice shoved through.

Last edited by HeX; 15th Apr 2012 at 19:01.
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Old 5th Apr 2012, 14:46   #18
RavenXXX2
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Quote:
Originally Posted by 555BUK View Post
SUCCESS!

To overclock 7850's past 1050MHz you need ASUS GPU Tool (works with any manufacturer).
Any chance you can do the 3DM11 P run, maybe tempted to go the bang for buck root.
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Old 5th Apr 2012, 14:50   #19
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At 1050 I was getting 6400ish on the P setting, i'd imagine at 1250 you'll be looking at 7000 ish.

Gah, want to get home and try mine

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Old 5th Apr 2012, 14:51   #20
Jerry64
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Looking to be good clockers then so tempted must resist

i7 2700k @ 4.6GHz Asus Maximus V Formula Avexir Core Blue Series 8GB 2400MHz@2133MHz Corsair AX850 MSI GTX 680 PE/Lightning Samsung 250GB SSD 840 EVO Corsair H100 Corsair 650D
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Old 5th Apr 2012, 15:23   #21
555BUK
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Okay, 1290MHz is stable @ 1.2v. Maybe I should start a new ">50% GPU overclock club thread".

Here's the P score. Note that my CPU is only a 2500K @ stock, and my mobo is a crappy H61.
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Old 5th Apr 2012, 16:13   #22
HeX
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Mine takes 1.225V for 1290

50% OC, chuffed ^_^

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Old 5th Apr 2012, 16:28   #23
555BUK
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Here you go guys. 7024 P Score 1325MHz / 6000MHz @ 1.215v. That's a 54% overclock on the reference air cooler. With a decent CPU/mobo I may have gained a few more points, but as this is currently the fastest 7850 on Futuremark, I am content.


These cards are frecking awesome overclockers. Probably the best GPU headroom ever.
Last edited by 555BUK; 5th Apr 2012 at 16:36.
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Old 5th Apr 2012, 16:30   #24
Jerry64
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Nice

i7 2700k @ 4.6GHz Asus Maximus V Formula Avexir Core Blue Series 8GB 2400MHz@2133MHz Corsair AX850 MSI GTX 680 PE/Lightning Samsung 250GB SSD 840 EVO Corsair H100 Corsair 650D
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Old 5th Apr 2012, 16:33   #25
HeX
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P7296 @ 1290/5800 @ 1.225V. 50% OC on air. CPU @ 4.2GHz.

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Old 5th Apr 2012, 16:36   #26
Jerry64
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So really is looking like the 7850 is the best perf/price card ?

i7 2700k @ 4.6GHz Asus Maximus V Formula Avexir Core Blue Series 8GB 2400MHz@2133MHz Corsair AX850 MSI GTX 680 PE/Lightning Samsung 250GB SSD 840 EVO Corsair H100 Corsair 650D
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Old 5th Apr 2012, 16:37   #27
HeX
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By a considerable margin IMHO

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Old 5th Apr 2012, 16:38   #28
555BUK
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Quote:
Originally Posted by HeX View Post
P7296 @ 1290/5800 @ 1.225V. 50% OC on air. CPU @ 4.2GHz.
Good score. I need a mobo that can overclock. My graphics score is a tiny bit higher than yours but my CP @ stock lets me down. We're beating stock 7950's for half the price.

Two of these in crossfire would absolutely murder a 7970 or GTX680 for less money.
Last edited by 555BUK; 5th Apr 2012 at 16:41.
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Old 5th Apr 2012, 16:39   #29
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And on only one 6 pin power

i7 2700k @ 4.6GHz Asus Maximus V Formula Avexir Core Blue Series 8GB 2400MHz@2133MHz Corsair AX850 MSI GTX 680 PE/Lightning Samsung 250GB SSD 840 EVO Corsair H100 Corsair 650D
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Old 5th Apr 2012, 16:39   #30
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Yeah i'm only ahead because of CPU score. That OC on your card is mad I don't think mine has that much in it, i've already had to use a tad more volts than you for 1290.

Time to see if 6000mem works

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