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*** The Official ATI Radeon HD 6950 Overclocking Thread ***

would just like to post re done my system. running watercooled 2600k
@ 4.7ghz. just got 2 Ek blocks for my 6950 unlock shaders and 1175 volts.
memory timings normal 6950 timings. with using msi afterburner just run
furmark @ 2560x1600 resolution in crossfire.
volts is 1240 core voltage managed to run 1490 memory 1000 on core.
temps never go above 38c. lol. having a sandy bridge just dont put enought heat in the loop.
using thermochill pa 120.3 and a 120.1 rad. well chuffed will try higher tomorow.
only just managed to get it running bedrooom a mess. will keep u posted. ;)
 
hmm...it just occured to me. Are you on 6950 or 6970 BIOS? If you are on 70 BIOS, be careful. I would change to the shader enabled 50 BIOS.

Hi m8 im on the modded 6950 bios stock memory timings but 1.175 volts.
and can overclock memory and core pretty high. and unlocked shaders.
y i didnt want to use the full 6970 bios because memeory timings r not the same as on the 6950.
 
hmm...it just occured to me. Are you on 6950 or 6970 BIOS? If you are on 70 BIOS, be careful. I would change to the shader enabled 50 BIOS.

No I'm on the modded 6950 BIOS voltage at 1.175 clocks at 950/1400. Going to see how high I can go after the weekend. Tempted to get a Thermalright Shaman as these things get noisy when you push them but I want to wait for the VRM sink which they said would be out by the end of the month.
 
Card sorted now and back running at 950/1400 stable now so here are Heaven benchmarks at 1920x1080 and 1600x1200 for J.D

82205388.png


That's with a 2500K turboing to 3.4 which is the multiplier limit for my motherboard. Roll on P67 mITX!

Nice score and just slightly behind mine at 1600x1200. I have higher card clocks though. Sorry I missed this post :(, thank you for running a benchmark so I could see where I'm at. It's appreciated.

I'm starting to get annoyed with people posting that don't even own the card thinking that the majority of these cards do not clock well. Reading this thread alone with only 7 pages shows that it does. I wish people would start reading more before blindly assuming whilst never even touching the 6950. :rolleyes:
 
I am a complete overclocking noob but mine is running with unlocked shaders at
930/1380, unfortunately the performance still isn't great because of my crappy Athlon x4 which I OC'd to 3.33 Ghz. Otherwise this is a great card and I'm suprised I could puxh mine so far on stock voltages and cooling.
 
@Blackhorse

Nice OC! My card can only do 950MHz at 1.175V. Not many can OC like yours. Set your overclock where ever you like it, 1.75V certainly won't hurt the card for 24/7. I run mine at 910 1.1V just because it runs a bit hot at 1.175V. As far as different gaming settings, it really depends on the game and your needs. My primary game is COD4 MP and it needs to run a min constant 125 fps. I can notice a definate difference in the 'feel of the game' with the card card clocked either 950 or 910 as opposed to the stock 800. Nothing a spectator would notice though.

You can use AB to set your OC (OC, V and fan profiles) upon startup with no user intervention. And as you know AB Beta 7 has working PowerPlay so lets the card return to 2D clocks as it should after a 3D session, so no user intervention in or out.

1) When you click the "Apply overclocking at system startup" box on the AB front page it will apply the clocks (clocks and voltage) you last used in AB but doesn't seem to apply the fan profile (it used to in earlier version). If you don't use an AB fan curve, this is all you need to do. OC will be applied behind the scene silently without AB starting up. Verify this by starting GPU-Z.

2) If you want to also use the AB fan control you will need to go the "Settings" page , under "Properties" and click the "Start with Windows" and "Start minimized" boxes. Also keep the "Apply overclocking at system startup" box checked as above. This will also apply the fan control on startup.


> For either of the two above options you need to first go to the AB folder on your PC and edit the Afterburner.cfg file. Set like this:

StartupDelay = 10000

Each digit is a millisecond so above would be 10 seconds. You can set this where you like, 20000 = 20 seconds, but 10 secs work well for me. This allows AB to start AFTER the ATi driver so avoids conflicts. So when your PC starts go real quick and start GPU-Z, if you get it open before 10 sec, watch the first page for a few secs and you will see the clocks apply.


You can also set AB to apply "Profiles" on startup, but I don't apply them on startup because it also starts the AB server and I don't want any more software at startup than necc so I don't use it this way. Without applying "Profiles" on startup AB will still apply the same clocks and settings it used the last time it was run, if set as above.

This lets it run fully automatic on my system (Vista 64). I never have to touch anything. The only thing I have noticed is that once clocks are applied this way and you do open AB and then change something it may not want to change. No big deal though as if set correctly you never need to open AB again anyway.

Ok a couple of questions on the startup of AB
Ive configured as you recomended it starts up on its own after everything else. Had to put a 15 second delay.
Got a lot of clutter in the startup and wanting to get around to doing a fresh install of windows.
Ive been playing around with the user defined fan speeds due to it going off like an aircraft carrier at the slightest heat on the card!
(It was near enough going to 100% fan speed, which admitently kept the heat down under 60 whilst benchmarking but too noisy!)

Ive done it in segments that it will only raise the fan above 20% if the heat starts to go above 31degress, up a steady progression ie 50% fan speed on 60 degrees.
Above this speed the fan is probably louder than my tower but rather the card be cool if it needs it
Does this sound about right?

Secondly AB starts with 800/1250 in profile.
Did you say you dont recomend setting a starting profile?

Whilst i know my card will do 950+ i think unless im benchmarking there no point stressing it above 900 and maybe try keep the voltage down?

What is the automatic profile management? Presumably its my above point but auto managed for me?
Ie i go into games and it auto overclocks and i come out and it reverts?

One other point im unsure about and i dont know if i may have a faulty card?
Whilst the card is working flat out i can hear a very faint high pitch squeel, now doing a quick google its something to do with the trasistors on the board vibrating and seems very common, but wasnt sure if it was worth getting an RMA, or if there was a high chance of the next one doing the same!!

All in all the card is amazing and had easilly replaced my CF 4850's
They are on fleabay and look to fetch about £45 each meaning this card was truly a bargain bang for buck as they say!!
 
Ive done it in segments that it will only raise the fan above 20% if the heat starts to go above 31degress, up a steady progression ie 50% fan speed on 60 degrees.
Above this speed the fan is probably louder than my tower but rather the card be cool if it needs it
Does this sound about right?

Yes, really though it is user preference. I limit mine to about 80C max under a max (bench/stabilty test) load. Lighter loads like most games don't require so much fan and so a downward slope in the curve which seems to easily keep gaming loads at about 70C. I set mine like this [24%@45C] [45%@75C] [70%@85C]


Secondly AB starts with 800/1250 in profile.

It should apply the Profile (OC & V) and fan control (if you also set the AB program to start) on startup. Are you checking the startup clocks AFTER the 15 second delay you are using? Check with GPU-Z. Have you applied AND saved the settings you are using to a Profile button [1-5]:

1) Change the OC and fan settings to your liking
2) Click Apply (see that they took)
3) Click Save
4) Click one of the Profile buttons [1-5] that you want to save the settings to.
5) Click (or Unclick then Click if it is already clicked) the "Apply overclocking at system startup" button.

Which ever saved Profile [1-5] you had applied on system shutdown should be auto applied on system startup.

All three checkboxes I mentioned earlier are checked? Including the "Apply overclocking at system startup" on the AB front page?


Did you say you dont recomend setting a starting profile?

Yes, but I was wrong. I think i have now corrected that information.


Whilst i know my card will do 950+ i think unless im benchmarking there no point stressing it above 900 and maybe try keep the voltage down?

I agree. I run mine 910 1.1V 24/7. Nice to know that it has more though. :) I am the same with my CPU, it is capable of 4.4~4.5GHz but I run it daily at 4GHz almost stock V.


What is the automatic profile management? Presumably its my above point but auto managed for me?

I haven't used it for years and don't remeber much about it, but it is for applying your settings to specific user selected conditions. Like 2D apps, 3D apps, or particular games, apps or scenarios. If you were to click the drop down box from, say, the 2D box you would see appear and be able to select a profile you have saved from the front page Profile [1-5] boxes, etc. And those settings would be auto applied when the conditions of profile are met.


Ie i go into games and it auto overclocks and i come out and it reverts?

Auto Profiles Managment is not needed for this. This is a PowerPlay feature and AB Beta 7 should work with PowerPlay. 2D, UVD, 3D clocks should all be automatic.
Have you enabled PowerPlay in the afterburner.cfg file like this:

UnofficialOverclockingEULA = I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
UnofficialOverclockingMode = 1


One other point im unsure about and i dont know if i may have a faulty card?
Whilst the card is working flat out i can hear a very faint high pitch squeel, now doing a quick google its something to do with the trasistors on the board vibrating and seems very common, but wasnt sure if it was worth getting an RMA, or if there was a high chance of the next one doing the same!!

That could be just the fan. The fan on these cards is different than on the 6970, 5870 and 5850's. Why they did this I don't know. The fans make an annoying buzzing noise that the ^ above fans don't. The ^ above fans are much smoother sounding. I was lucky that one of my cards had a 6970 fan on it and the other I will install a 5870 fan to.

But it could be coil whine. I have heard that some of them do this, as well as most GFX cards. It will not affect the life of the card and is harmless aside from the annoyance. But if it is as you said "very faint" I would think it is not so bothersome. My card makes abit of noise but really no more than my CPU, MB and RAM do under a heavy load. It would take a lot for me to RMA that card you have, it is a gem the way it OC's and the chances of getting another that clocks like that are slim. And yes, from the sound of it, it is likely another card would do the same, or worse.
 
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OK, I have told you completely wrong about the need for Profiles. :o Sheesh, I should have looked at the program closer. I have used it so long I thought I knew it better than I do. And a lot of my memory on Profiles is from RivaTuner...lol. I just happened to be looking around at the program and noticed the "Profile" tag in front of the [1-5] buttons. I didn't even realize those were considered Profile buttons...:(.


So...in short... YES you do need Profiles saved on the AB front page...just not the Auto Profiles from the settings page.

I am going to go back and see if I can correct my last posts.

^ Done. I think I have it fixed now. Very sorry for the excercise in frustration. I hate bad information, especially when it's mine. :o



You might correct my information in your last quote so as to not mislead someone that might run across it.
 
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do u need 1 or 2 crossfire bridges when using 6950 in crossfire?

im using 2 crossfire bridges but in games i'm getting poor performance , less than a single 6950...

but in 3DMark 11 and Heaven Benchmark v2.1, crossfire seems to be working fine..
 
Need for Speed Hot Pursuit, and tdu2

If you have the latest Catalyst Application Profile installed, rename nfs11.exe to Dirt2.exe. This forces it to use the crossfire profile for Dirt2 which increases performance :

http://www.gamefaqs.com/boards/997710-need-for-speed-hot-pursuit/57648131/639363219

As for tdu2 :

"I'm sorry to say that the release version of TDU2 will not be optimized for SLI and Crossfire systems. After launch, we'll be evaluating the possibility of including this in a future patch"

http://forums.steampowered.com/forums/showthread.php?p=20752351

Just need to remember to disable crossfire in CCC when playing tdu2.

would using 2 bridges do this?

Using 2 bridges wouldn't make any difference to performance afaik.

Keep in mind that not all games support crossfire 100%.

Most of the time ATi can improve this by updating the Catalyst Application Profiles, which I think they're planning on doing on a weekly basis.
 
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