3.5ns ram compared to 4ns..

[godzilla]

ive just got a new gainward ti4200 64meg graphics card, the 128 versions have 4ns ram and theres a calcuation you can do which gives you the resulting mhz the ram is capable of, the 128mb card with 4ns ram wich is capable of 500mhz, the 64mb version has 3.5ns ram so anyone know what this card can comfortably handle? currently at a default of 513..

ps the card is a gainward ultra/650 64mb ddr tv-out/dvi

is the 650 an indication of what it can be clocked to? also its not a 'golden sample' so i dont get the 'clocked setting' in the control panel only the default, but this is just a marketing thing right?

[InnovaZero]

i'd say with stock cooling as long as you don't push it right away 540-580 area maybe even 600mhz.

[Jimstep]

When the metric is in nanoseconds, that is the measure of the length of the clock cycle. This is one way of specifying the speed. On a calculator, 4ns is 4E-9.

The other way is to list the number of cycles in one second. So, if you divide 1 by 4ns you get 250Mhz, also can be stated as 250 million cycles per second.

For 3.5ns, take 1 divided by 3.5ns and that equals roughly 285Mhz.

Since this is DDR memory, double the speed. 500Mhz for the 4ns version and about 570Mhz for the 3.5ns.

Hope this helps.

[godzilla]

thanks jimstep thats exactly what i was after; so hopfully taking the ram to 570 (285x2) for starters shouldnt be a prob thanks again!

[InnovaZero]

No, you don't want to push it that hard that fast. That's the first rule in the book for overclockers. You want to slowly increase the ram by 5-10mhz incriments, then test a 3d program, repeat. You push it hard fast without burn-in, your going to damage the ram, thus limiting your card's OCing abilities.

[godzilla]

yeah i was gonna do that anyhow, i think ive damaged my cpu already by jumping around different speeds and im hoping this cards gonna last me a good year or so!