Will this ram work in the Epox?

[jagr10]

I saw this on the anandtech price guide and it seemed to be the lates ram type:

PC2400 DDR CAS 2 - 256MB

Will this work in the EPoX EP-8K7A board?

 

[formulav8]

Sure it will work. Thats the stuff I need to get.

 

[Soccerman]

think about it this way. it's still DDR SDRAM right?

what's the difference then?

the mhz that this RAM is capable of hitting is higher, therefor the rating (PC2400) is higher. simple as that. same thing with PC133 vs PC100, and PC800 vs PC600, etc..

 

[bacillus]

eloquently put Soccerman!

 

[jagr10]

thanks soccerman! Didn't know all that. Does it make a significant difference in performance by getting that ram vs the slightly slower ones? I'm getting a 1.4GHz t-bird too.

 

[Soccerman]

higher speed RAM doesn't affect performance if you run it at the same speed as slower RAM.

for example, PC2100 RAM used to be some of the fastest stuff you could buy until recently. in case you're wondering, PC2100 RAM, is RAM capable of 2.1 gigabytes/second theoretical transfer rates. it runs at 133mhz.

PC2400 RAM is RAM capable of 2.4 gigabytes/second. it runs at a higher mhz to get this rate.

now, I COULD run my PC2400 RAM at 133mhz, but I actually wouldn't see a difference in performance at all when comparing it to PC2100.

PC2400 RAM is capable of hitting the mhz that gives you 2.4 gigabytes a second, so you'll see an improvement in performance only then (because either your PC2100 RAM will not hit that speed, or you'll have to decrease memory timings to hit it).

in case you want to know how to derive the PCxxxx rating for DDR SDRAM. it's simple. take PC2100 for example.

this RAM, runs on a 64 bit bus, and transmits data twice every clock. not only that, but each piece of data is called a bit.

so in theory, this would transmit 64X2 bits of data in every clock cycle. that means 128 bits, or 16 bytes.

now, if PC2100 DDR SDRAM runs at 133mhz, that means it has 133 MILLION clock cycles per second.

therefor, you simply take that 16 byte sample for one clock, and multiply that by 133 million. you get a rough estimate to how much throughput this RAM could take.

the equation for this is simple.. let T = througput, f = frequency, b = bits in a byte, d for # of bits sent per clock cycle for one of the pins of the bus, and B for bus.

T=fdB/b

T=(133*10^6)(2)(64)/8

so, if T=2.4 gigabytes a second..

Tb/dB=f

(2.4x1024^3)(8)/(2)(64) = 161mhz

 

[Soccerman]

oh, btw, I think it's worth it, especially with that MOBO, becuase I hear that thing has some sweet fsb overclocking abilities..

I can't wait to see if this 1/6th multiplier is true.. PC3200 RAM would follow suite soon..

 

[NelsonMuntz]

That will definitely work with that board and it is a little faster than most people get. It is similar to what some ar calling PC-150 RAM, except its DDR instead of plain SDRAM.

 

[ST4RCUTTER]

Doh!