RV350 (R9600) thermal question
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Thread: RV350 (R9600) thermal question

  1. #1
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    RV350 (R9600) thermal question

    Just how much heat does a 9600pro core produce? I know the 9700/9800 consumes up to 50W, but the 9600 is not nearly as complex. The reason I ask is that I may try to cool the card passively with a large aluminum heatsink. The 9600np I owned was passive with a small Al HS, but it got pretty hot to the touch. The 9600pro has an additional 75mhz to add to the TPD, so I'm wondering if this idea will work.

    Any thoughts?

  2. #2
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    xbit-labs did an 'anti-extreme' overclocking project.. reducing voltages to get lower temps at stock speeds.

    the page i linked to shows that Sapphire 9600XT ultimate ed. has 1.3v VPU.. so do what ever math is needed with that number, 75 million transistors (or is it 80m?) and how ever big the die size is and you've got your answer.

    considering Sapphire is able to passively cool a 9600XT and Xbitlabs found the temps to not get higher then 66 C.. i would assume a large heatsink would be fine.. even better if you had some case cooling too.
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  3. #3
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    Well, I'm going to attempt the mod this weekend, so I guess we will see what happens.

  4. #4
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    how are you going to attact it? i've always just glued my heatsinks on, but since they've changed to a flip-chip design, that can't be done anymore

    i'm wonder because i hope to get a new 9600 or something in the near future and since i want silence and not buy a Sapphire ultimate ed. i want to do it myself (just as you are).. but i'm not sure how i'd mount it. ol'man's guide was pretty good though.
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  5. #5
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    Well, the 9600pro I have is an ATi, and instead of pasting the HSF to the core, they used retention springs and thermal paste. This is good, since I know I can remove the noisemaker without bringing half of the die off with it.

    Since I have the 2 mounting holes, I lined up an old aluminum HS to the card, marked the holes with a pencil, and drilled all the way through. I think to attach it, I will use some really long, skinny bolts with a combination of rubber and steel washers. The HS is rated for 65W or so, so I think it will work well for passive cooling. The 9600 I used to own was passively cooled as well. It only ran at 325mhz, and the Al HS got really hot (reminded me of the V3, lol), but never crashed or artifacted. I figure a larger HS will make up for the extra 75mhz, but I guess we will see. I will maybe take pictures if this is successful.

  6. #6
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    You must remember that not only is that a smaller transister count from having 1/2 the pixel pipelines, but it is also manufactured using .13 micron instead of .15 micron manufacturing (low-k dielectric for the XT). The Radeon 9600Pro is clocked faster. I check the speeds of Saphires NP, Pro, and XT and they run 325, 400, and 500 respectively. Even the XT has pretty wimpy cooling compared to its bigger brothers. I'm guessing that smaller core only generates about 25w. It might even be less. Think about how many watts a CPU could generate and still use that small of a CPU.
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  7. #7
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    It does not seem to produce that much heat. I guess you could easily run it with a P4 aluminium HS (a la ol'man). The stock HSF is pretty easy to remove, it took only a few minutes to remove it and put an Iceberq on mine.

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