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Thread: 2-4850 X2's Overclocking?

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    Default 2-4850 X2's Overclocking?

    I am looking to overclock my 2-(Crossfire) Sapphire 4850 X2's...

    I need to know a exact fitting after market heatsink for them unless the default ones are amazing...

    I have a 850W Cosair Powersupply so I think power is just fine!

    I want to get them as high as possible. I heard overclocking them in the bios is the best idea due to voltage editing etc...

    Anyone successfully overclocked any of these yet?!

    I realize they have a dual bios... I am ready to tackle this.

  2. #2
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    Quote Originally Posted by Ghzsystems View Post
    I am looking to overclock my 2-(Crossfire) Sapphire 4850 X2's...

    I need to know a exact fitting after market heatsink for them unless the default ones are amazing...

    I have a 850W Cosair Powersupply so I think power is just fine!

    I want to get them as high as possible. I heard overclocking them in the bios is the best idea due to voltage editing etc...

    Anyone successfully overclocked any of these yet?!

    I realize they have a dual bios... I am ready to tackle this.
    I have both of these and one will overclock in the bios to 773/1004 however I don't like the memory timing as it's pretty slow.

    My other one however get's artifacts immediately.

    I need these to have higher memory bandwidth and possibly a lower clock?

    Any ideas on what to do? Possibly numbers I could try?

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    When I overclocked my 4870, I noticed that increased memory speeds yielded results that were barely noticeable. However, on the core,, results went up a fair bit.

    Are the 4850s on GDDR3 or GDDR5?

    If it's on GDDR5, then I'd say focus more on OCing the core than the memory.

    http://hwbot.org/hardware/videocard/radeon_hd_4850x2

    There's a link to the HWBot page.

    They all have about 150MHz of memory speed over you, but your core clock is higher. Their processors are netting those results, actually.

    How high were you trying to clock?

    The artifacting board, is it overheating, or does it need more voltage?

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    Quote Originally Posted by logan View Post
    When I overclocked my 4870, I noticed that increased memory speeds yielded results that were barely noticeable. However, on the core,, results went up a fair bit.

    Are the 4850s on GDDR3 or GDDR5?

    If it's on GDDR5, then I'd say focus more on OCing the core than the memory.

    http://hwbot.org/hardware/videocard/radeon_hd_4850x2

    There's a link to the HWBot page.

    They all have about 150MHz of memory speed over you, but your core clock is higher. Their processors are netting those results, actually.

    How high were you trying to clock?

    The artifacting board, is it overheating, or does it need more voltage?

    I had 1 card with artifacts....

    The other overclocked just fine. So I need to find a friendly medium so they sync up in crossfire.

    I have done
    2D - 500, 750, 1.046
    3D - 773, 1004, 1.158

    The other card barely goes above 750 core without problems. Memory being the same speed.

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    it's voltage - are there versions of the card that are clocked higher at stock? you can replace flash the BIOS to one that is clocked higher / calls for more ovltage

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    Ok, I own this card, and can give you some pointers. I have replaced my stock heatsink with 2x Zalman VF900's, and used OCZ Freeze for the Thermal compound. They are much quieter now, and the temps are much better. Running 4x of these heatsinks will probably require you to use an aftermarket fan controller, as the Zalman VF900 uses a 3pin connector.

    Secondly, in order to really overclock these cards, you need to use ATI Tray Tools. You will find the Overclock settings in the Hardware section. I boosted my voltage up the maximum allowable by the program, and was able to clock mine to 750/1150.
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    Ghzsystems (13-04-2010)

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    Quote Originally Posted by shattered.likeness View Post
    Ok, I own this card, and can give you some pointers. I have replaced my stock heatsink with 2x Zalman VF900's, and used OCZ Freeze for the Thermal compound. They are much quieter now, and the temps are much better. Running 4x of these heatsinks will probably require you to use an aftermarket fan controller, as the Zalman VF900 uses a 3pin connector.

    Secondly, in order to really overclock these cards, you need to use ATI Tray Tools. You will find the Overclock settings in the Hardware section. I boosted my voltage up the maximum allowable by the program, and was able to clock mine to 750/1150.
    Amazing information!

    I didn't even know I could pull off getting aftermarket coolers. Any ideas for a 9800GTX by XFX?

    I can get up to 800core easily on that. But I honestly think there is some heat issues. I don't really know where to find aftermarket heatsinks but i am intrested because I think this stock one on it sucks.

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    Quote Originally Posted by logan View Post
    it's voltage - are there versions of the card that are clocked higher at stock? you can replace flash the BIOS to one that is clocked higher / calls for more ovltage
    Voltages are modded per bios.

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    I think voltage can be increased via GPUtool. I was successful with my 2 4890's. There should be no need to flash the bios.


    http://www.techpowerup.com/downloads/1383/mirrors.php

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    The 4850X2 can have the voltages modded by using ATT (ATI Tray Tools). That's how I got my scores as high as I did on HWBot.
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