How do you determine max freq for memory

[CharlieMike]

...based on its "ns"...

for instance, i have a Radeon8500 with 3.6ns memory.

what is the max spec for MHz? stock speed is 275MHz (DDR, so 550MHz)...

i seem to remember a formula for determining the max MHz based on memory speed....

help?

 

[Budman]

1000 devided by 36 = 27.77777777777777

so your ram is rated 277mhz.

you devide 1000 by the Ns rating.

 

[CharlieMike]

umm....is it THAT easy?

the formula i saw had a couple of other numbers and computations....

?

 

[Budman]

Originally posted by: CharlieMike
umm....is it THAT easy?

the formula i saw had a couple of other numbers and computations....

?

There's no magic formula invented by elves in an enchanted forest,it's 1000 devided by ns = your rated speed.

 

[Ilmater]

The formula you saw was probably (I've seen this before) something times a million divided by something divided by a million blah blah blah... Anyway, he was right. MHz is simply the millions of instructions per second, so if your RAM is rated to do an instruction every second. The formula you saw was probably (1 divided by 1,000,000) divided by (3.6 divided by 1,000,000,000). That will get you there, but the easiest way is 10,000 divided by the nanosecond rating.

 

[Goi]

If you've ever taken high school physics you should know this
The MHz rating is the "frequency". It measures something at a rate of how many times per time unit(in this case seconds).
The ns rating is the "period". It measures how long it takes something to perform something.

So, as an analogy, lets say I take 0.1s, or 1ms, to type 1 letter on a keyboard, I would have a "frequency" rating of 10Hz, or 10 letters per second. Simple?

In the same, way, a memory rating of 3.6ns(or 3.6x10^9s), assuming its the clock cycle rating and now the access time rating(or any other rating for that matter) is 277.78MHz as stated.

However, the "rating" you see on the memory chips are often not the clock cycle rating but the access time rating, so you can't just do a conversion like that.

 

[CharlieMike]

If you've ever taken high school physics you should know this

d00d, it's been SO long since i even THOUGHT about attending a high school physics course...

so--NO, i do NOT have any high school physics course in my head on which i can draw from....

 

[NesuD]

CharlieMike turn on your PM's