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Thread: ATI 4850/4870 voltmod thread

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  1. #11
    Xtreme Member
    Join Date
    Dec 2005
    Location
    Rennes (france)
    Posts
    443
    I was wondering : was is the maximum wattage the regulation chip can deliver to the GPU chip on a HD4850? I made calculations, running @ 900mhz 1.49v draws 140% more than it draws with stock freq and voltage (240% of the stock wattage)
    Assuming a 120w power consumption @ stock, that would lead to 290w only for GPU, that's pretty high if you ask me

    Anyway, here's what I got with accelero S1 + 120mm @ 7v :



    I've also flashed the card with a bios that was supposed to solve the frequencies issue in double screen (locked in 3D mode) but it wasn't working really good though :


    Anyway, that's good to see this chip can run @ 160mhz 0.98v, which would lead to a 18% consumption (<22w) which is nice for laptop

    Third thing : I used to be freq limited for memory chip with stock cooler. I mentionned earlier that the pencilmod didn't improve the maximum frequency I could get out of them. I though I had crapy memory chip but here's what I get with accelero S1 and its poors ramsink :

    Last edited by Clemmaster; 07-08-2008 at 04:15 AM.

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