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Thread: Overclocking a GFX card - Mem Vs Core?

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    Overclocking a GFX card - Mem Vs Core?

    Having just got my new 7800GT running at a nice 500 core 1150 mem, which i think is about tops, i was wondering what people think is the most effective way to OC a gfx card. Should i slacken the memory and uping the core or visa versa? Only need an extra 48 to hit the big 8000 points in 3dmark05. Silly and a little pointless, but i would rather like to get there if i can.

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    Most effective way is sticking a Massoooove heatsink on it but you will always hit a cap at some point.

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    What do you use to o/c the 7800GT? I've just replaced my woeful ATi X800XT card with a BFG 7800GT (which is already overclocked by BFG to 425/1050) and my system is running stable now but everything is at stock speeds.

    I'm sure I can do a little o/c'ing without screwing things up!

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    I just use the Coolbits hack and do it in the display properties then test using 3dmark05 and a couple of games.

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    Or you could just use ATI tools to look for artifacts.. pimp out a setting, enable it and test it in ATI tools.. if it detects a delta, then lower that clock abit.. to check whether ur overclock is actually giving any major improvements.. u could always use RTB*** somthing something.. never manage to remember the whole thing..
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    given a choice...I'd always go for Faster Memory

    But one doesn't normally come at the expense of the other....so both

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    My 7800GTX on air can go 470/1400 but not better than 490/1350.

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    Remember that 7800s scale in steps rather than linearly
    "because of the way clock frequencies scale for the 7800 GT and GTX, increases in core clock speeds don't always represent actual increases in performance. There are "plateaus" where several consecutive clock speeds (i.e. 468, 469, 470MHz) yield nearly exactly the same performance, and then we see a sudden step up in performance between certain frequencies (i.e. 477MHz, 478MHz ) to create a "stair-like" graph when visualizing the performance scaling."
    http://www.anandtech.com/video/showdoc.aspx?i=2494&p=3

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    I think that overclocking the memory and core are more or less mutually exclusive.

    I would run rthdribl in the background and use Rivatuner to gradually increase the frequencies. Rthbribl shows nice green artifacts when you've gone too far.

    If you only need 48 points try things like disabling all programs running in the background and make sure that the driver settings are all on performance. A bit more on your cpu, which should easily be possible with a San Diego, should also get you a few more points.

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