EVGA GTX 285 FTW Precision settings

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mohsh86
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2009/11/23 10:59:10 (permalink)
Ok, so i was trying this Heaving benchmark (i know its DX11 Card Oriented, but just for the sake of benchmarking and considering changing settings if no harm)

the EVGA GTX 285 FTW product page when compared to others, it says it has the highest Ram Speed: 2646Mhz (effective)

in the Prescision Application, the The Ram Clock is set to 1323 Mhz, with max ( i didn't apply it ) of 2120 Mhz

now is the Ram speed is the Same As Ram clock ? (i think so ) and if so, i can set the Ram clock to the one specifid in the product page ? 2646Mhz

how with the precision tool max is 2120 Mhz ?
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    Nereus
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 11:07:15 (permalink)
    It's DDR memory - "double data rate" - it has a x2 multiplier, so 1323MHz x 2 = 2646MHz, so everything is fine.  

    Same with system memory - for example will show say 800Mhz, but effective is 1600Mhz (if DDR2), or if DDR3 memory you'll see 533MHz, but 533 x 3 = 1600MHz which is the effective.


    post edited by Nereus - 2009/11/23 11:11:50


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    Lothy
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 12:08:36 (permalink)
    Precision tool shows you i/o clock, which is 1323 Mhz.
    DDR allows 2 data transfers per clock cycle, thus 2646 megatransfers per second.

    A bit off topic but I think system DDR3 has i/o bus clocked at x4 of memory DRAM cell clock.
    Say memory cell clock is 200 Mhz, i/o bus is at 800 Mhz and you get 1600 megatransfers per sec, thus DDR3-1600
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    HeavyHemi
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 12:10:36 (permalink)
    It's DDR memory - "double data rate" - it has a x2 multiplier, so 1323MHz x 2 = 2646MHz, so everything is fine.  

    Same with system memory - for example will show say 800Mhz, but effective is 1600Mhz (if DDR2), or if DDR3 memory you'll see 533MHz, but 533 x 3 = 1600MHz which is the effective.




    Okay but since the memory on the GPU is DDR3, how does that work?
    post edited by HeavyHemi - 2009/11/23 12:12:49

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    Nereus
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 13:04:03 (permalink)
    Hmmm good point. That's just how I had it explained to me when I asked the same question a long time ago.. probably when DDR3 wasn't commonplace.

    Anyone care to enlighten us?


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    HeavyHemi
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 13:22:03 (permalink)
    Nereus

    Hmmm good point. That's just how I had it explained to me when I asked the same question a long time ago.. probably when DDR3 wasn't commonplace.

    Anyone care to enlighten us?


    DDR2 and DDR3 are similar except that DDR3 has double the date rate for each clock cycle. So they are both 4X the bus rate with DDR3 having 2X the data rate.

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    Nereus
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    Re:EVGA GTX 285 FTW Precision settings 2009/11/23 13:34:22 (permalink)
    Thanks    So I was sort of correct, just a little confuzzled.. 


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