how fast are 5ns ram? and overclocing mx400 card

[knutp]

I got a gainward gf2mx with 5ns ram (it says 4 on the ram though). But how fast are 5 ns ram? 200mhz?

 

[E36M3]

Yeah, you are right. The 5ns RAM is 200 Mhz, or 400 if DDR. If you chips says 4ns, then that is what they are and they are 250 Mhz or 500 Mhz DDR.

 

[Muerto]

Yep, 5ns = 200MHz.

 

[Zach]

1000/5 = 200Mhz

About all I remember from CS271.

 

[knutp]

Great zach! that's the thing I have been looking for some time. I have never figured out how to do that. The card is running as stable as it could be at 200 mhz (geforce 2mx) and the core at 210. Im going to try it higher now.

 

[knutp]

I now got it running at 220 core, and 220 mem. Got 3000 in 3dmark 2001 with 12.41 WHQL drivers. Could I get it further? and should I get more out of the ram or the core? it is a fan on the core.

 

[dhslammer]

edit: stupid joke, nevermind

 

[Zach]

<< Great zach! that's the thing I have been looking for some time. >>



The funny thing is that it's totally the wrong equation.. I ended up figuring out a simplified version when doing some homework at midnight. I was plugging un numbers, what if the clock is a 2ns pulse and the RAM takes 5ns and the registers 1ns and yadda yadda. Getting answers that looked good, the chip can go so and so speed. The next day I compared answers with people, I had more right, and I was using some BS made up equation i derived on my own. It's probably in other books, but wasn't in mine.

That was the only book I ever got a fair value back from too, bought at about $80 and sold at a stunning $70. Usually I get like $10 back on books.

 

[drewski]

actually that formula is right. at least by my poor rekoning

take 1 second (1 billion ns) devide by the speed per cycle (5ns/cycle) and get cycles in one second (Hz) no?

Thus 1,000,000,000(ns/s)/5(ns/cycle) = 200,000,000 (cycle/sec)

simplify the formula to divide both sides by 1,000,000

1,000/Xns = YMHz

if i'm wrong let's just say &quot;It's the new math&quot;