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Want to overclock my 5850 Sapphire

post #1 of 11
Thread Starter 
OK - I want to overclock my ATI Radeon 5850 Sapphire, I have overclocked this already in Catalyst Control Center but I want to take this further

At idle the GPU runs at about 29'c

Any Help, I herd you can do this in MSI Afterburner but not sure what values to set my Graphics card too
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post #2 of 11
In afterburner just set the voltage all the way up and add 150mhz to your core. Add 100mhz to your mem and make sure you have a custom fan profile on so your card doesn't get too hot. Then test for stability and work your voltage down from there.
post #3 of 11
Quote:
Originally Posted by lukeibob View Post
OK - I want to overclock my ATI Radeon 5850 Sapphire, I have overclocked this already in Catalyst Control Center but I want to take this further

At idle the GPU runs at about 29'c

Any Help, I herd you can do this in MSI Afterburner but not sure what values to set my Graphics card too
http://www.sapphiretech.com/ssc/TriXX/
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post #4 of 11
Jesus talk about bad advice (Calmster). Youi should do the opposite of what this guy is suggesting. You should stay at stock voltage and bump the core up first by 10-20mhz increments until its unstable, then you can start upping the voltage also by small increments until you get the core clock stable again and then repeat until you either reach a wall or are happy with your overclock. You can then start oc'ing the memory which can be tricky with newer cards as the memory wont actually cause errors when its clocked too high it will just degrade in performance. This is because it has error checking routines built in and the more errors it has to correct the less performance you will see. Is your card a reference model or a non refernece model btw? i ask this because it can have an effect on whether voltages can actually be adjusted or not. http://hothardware.com/articleimages...on-hd-5850.jpg thats a reference 5850 if yours looks different then its a non reference.
Edited by fashric - 5/25/11 at 10:29am
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post #5 of 11
Quote:
Originally Posted by Calmster View Post
In afterburner just set the voltage all the way up and add 150mhz to your core. Add 100mhz to your mem and make sure you have a custom fan profile on so your card doesn't get too hot. Then test for stability and work your voltage down from there.
Do the opposite of this.

Start by increasing your core by 10 MHz at a time and run Furmark or something like that and watch for artifacts. Keep increasing the core until you see some artifacts (or your display driver crashes) in Furmark then increase voltage. I wouldn't let your temps get past the high 70's °C

Take it slow, you don't want to damage anything. Once you reach a good core clock you can begin upping your memory speed as well but there is no voltage for that. Once you get a crash of some sort you need to back it up and stay there.
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post #6 of 11
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post #7 of 11
Okay then thats a non reference model so you will need to use Sapphire Trixx instead of Afterburner to unlock the voltage. Maximum safe voltage for reference models is 1.25-1.30v I'm not sure if this is the same on non reference cards so you may want to go easy on the voltage until you can find out what the limits are.
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post #8 of 11
Thread Starter 
OK Thanks
Whats diffrence between Refrence and Non Refrence Cards ?

I have just downloaded Sapphire Trixx
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post #9 of 11
I would bump up volts and core then work it down, not like your going to blow out your card with a few hours of testing at max votls on a 5850
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post #10 of 11
Quote:
Originally Posted by lukeibob View Post
OK Thanks
Whats diffrence between Refrence and Non Refrence Cards ?

I have just downloaded Sapphire Trixx
Reference cards are all identical, made to the exact specifications ATI laid out for the card when they designed it, including the 'Batmobile' style cooler on the 5800-series cards.

The most important facet to a reference card, in this particular scenario, is that they all have the exact same voltage controller, and this controller is definitely addressable by Afterburner (i.e. you can successfully adjust the voltage using AB on all reference 5800-series cards).

'Non-Reference' versions of cards, like the one you have, usually start to come out after the card has been on the market for a little while. This is when the 'partners' of ATI (or rather AMD, now) start to tweak the design of the 'reference' cards for one of two basic purposes: Upgrading the components to make higher-end models of the card (such as the MSI Lightning and Hawk models), or changing (often downgrading) the components to make cheaper models of the card.

For non-reference cards, the layout of the board is often changed, which is why, when you hear people talking about full-cover water blocks, you'll very often hear the subject of 'reference PCB' be discussed. Many such blocks will only properly fit a reference PCB version of the card. But even if the PCB layout stays the same, if any components are changed, the card as a whole can be properly called 'non-reference'.

The cooling system is often changed out on non-reference models, however, changing the cooling system alone does not automatically make a card non-reference ... it's just non-reference cooling. It's the board, and the components on the board, that determine whether a card is truly reference or not.

As I say above, another important component that is often changed out with non-reference models is the voltage controller, as this is a relatively costly part. However, applications like Afterburner have to be specifically programmed to address each model of voltage controller, in order for the app to be able to adjust the voltage on the card.

Apparently (according to others on this thread), the particular voltage controller on your non-reference card is one that Afterburner has not (yet) been programmed to address. However, apparently the Trixx application already has been (being that it's made by Sapphire, like your card was).

So that's why you have to use Trixx to be able to successfully adjust your GPU voltage (at least for now).

Does that all make sense?
Edited by brettjv - 5/25/11 at 3:03pm
    
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