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    Voltage and Overclocking

    Discussion in 'Gaming (Software and Graphics Cards)' started by Bearclaw, May 8, 2011.

  1. Bearclaw

    Bearclaw Steaming

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    Hey all, quick question. For the 5870, does increasing voltage affect both the amount of memory that can be overclocked as well as core?

    I know the core OC headroom can be increased with more voltage, but does the same apply to memory?
     
    Bearclaw, May 8, 2011
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  2. Micaiah

    Micaiah Notebook Deity

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    No, the VRAM operates on its own voltage specifications.
     
    Micaiah, May 9, 2011
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  3. Bearclaw

    Bearclaw Steaming

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    Interesting, thanks. I was wondering why I was getting more weird flickers after upping the voltage. Think I'll just stick to upping the core instead and keep my mem at the original OC. Doesn't seem to make much diff anyways, since I use only 1680x1050 res.
     
    Bearclaw, May 9, 2011
    #3
  4. ikovac

    ikovac Cooler and faster... NBR Reviewer

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    Mem OC will get you more speed especially with slower GDDR3 like on my 5850. I always overclock mem first and then gpu core. In my loooong OC experience core usually waits for the slow memory.

    I can overclock from 625/800 to 720/1000 at stock voltage (1V at busy and 0.9V at idle). I can overclock upto 800/1100 at 1.125V getting roughly 7500-7700 in Vantage in comparison to 5800 at default. Temps go up 2-3 C at most and after 1 hour of gaming it reaches 72-74 degrees C at fastest fan speed. At stock speeds it reaches 71 :).

    I also have tweaked fan speeds so my laptop is completely silent on idle and in everyday windows work (I have an SSD and my other inside disk is the only thig that makes a bit of humming - for 15 minutes and then it also goes sleeping if it is not used)
     
    ikovac, May 9, 2011
    #4