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Old 08-08-2007, 11:56 AM   #1
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Exclamation GPU Memory Clock Speed

I currently have the 8800 GTS 640MB
http://www.newegg.com/Product/Produc...82E16814130071
and it says in the description that the memory clock speed is 1600MHz and other people have said they overclocked it to 1800MHz+ but when I use nTune or RivaTuner, apparently my memory is only running at 800MHz and can only be overclocked to max around 1100MHz. Am I missing something?
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Old 08-08-2007, 01:04 PM   #2
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Default Re: GPU Memory Clock Speed

The memory it uses is GDDR3, which uses the rising and falling edges of the clock signal. Basically it doubles the clock (hence "double data rate," or DDR), so the 800MHz is really 1600MHz. So 1100MHz would be 2200MHz, an impressive clock!
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Old 08-08-2007, 03:42 PM   #3
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Default Re: GPU Memory Clock Speed

Just curious whats your Memory core clock at?
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Old 08-08-2007, 04:01 PM   #4
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Default Re: GPU Memory Clock Speed

Quote:
Originally Posted by MattieDaShark83 View Post
Just curious whats your Memory core clock at?
EDIT: My bad...
Mine? (If not, sorry for the confusion )

My memory's left stock right now; my card doesn't respond to overclocking well at all. Last time I tried even a mild overclock of 600/850 while I was playing Oblivion, it got all jumpy and less and less was being drawn. I got out of it, only to find that a mere quarter of my screen was being displayed, in 16-bit color. So I've decided not to overclock it; it's fast enough at stock for me.

I've run RivaTuner during sessions of playing and I've never seen it near 70C... it's usually near 63ish. I don't know what the problem could be. It rarely happens, but when it does, it's baaad.
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Old 08-08-2007, 06:12 PM   #5
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Default Re: GPU Memory Clock Speed

My core clock is running 500MHz stock but I like to bump it up just a little to 550-575 just for now since it's stock cooling but once I get my watercooling I'll just alot higher. I'll knock that bad boy all the way up to like 800 I think is the max.
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Old 08-08-2007, 06:30 PM   #6
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Default Re: GPU Memory Clock Speed

nice OC hopefully i will be able to get the same who makes your card?

EDIT:
nvm stupid question
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Old 08-09-2007, 07:12 AM   #7
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Default Re: GPU Memory Clock Speed

my nvidia gefoce 6100 is running at 599mhz
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Old 08-09-2007, 07:31 AM   #8
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Default Re: GPU Memory Clock Speed

Okay I was just curious. I was like no way is he running anything over a 600 core with a 2200 mem clock. See as you increase your core clock you won't be able to clock the memory as high. You just have to find the right mix between core & memory. Of course the shader clock comes into play as well. I had my setting in at 672/2020 but forgot they add in the shader clock somehow and it can adjust the numbers up or down to match it. So my actual clock was 675/2016 with a shader clock at 1566 were stock shader clock is 1188.
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