Memory latency and frequency

[patrickjp93]

not on  current platforms its not ...  its still 64bit it won't ever be 128bit 

facepalm* DDR3 can only move 32 bits in either direction, but it can move 2 channels at once and was sneakily labeled 64-bit even though memory benchmarks proved this was BS. DDR4 can actually move 64 bits both directions simultaneously in the same clock.

[Legitsu]

facepalm* DDR3 can only move 32 bits in either direction, but it can move 2 channels at once and was sneakily labeled 64-bit even though memory benchmarks proved this was BS. DDR4 can actually move 64 bits both directions simultaneously in the same clock.

read this and then talk to me after you understand it 

https://www.skhynix.com/inc/pdfDownload.jsp?path=/datasheet/Timing_Device/DDR4_Device_operation_Timing_diagram_computing.pdf

slightly more noob friendly but drastically less technical 

http://www.samsung.com/global/business/semiconductor/file/media/DDR4_Brochure-0.pdf

the bit depth they are talking about is the inner-bank per clock rate not the cpu <> ram bus aka ram to ram copy operations 

imc != ram 

the imc on haswell-e ddr4 is indeed 128bit but Its split between either 32 bits per channel for 4 channels or 64 bits per channel for two channels operating in ASYNC mode

[CoolaxGaming]

No, NO, NO! It's latency over clock rate. cycles/cycles-per-second = seconds (absolute latency).

 

You want high clock rate, low latency. also, its technically CL/(rate/2) due to DDR being double data rate and double pumping each clock.

 

A low absolute number is best.

Yeah, learn math... Try and read what I posted then you will understand

[patrickjp93]

Yeah, learn math... Try and read what I posted then you will understand

In your math you claimed high numbers were a good thing. That's correct about half the time, and it's not true to the definition and behavior of the technology itself. Did you ever wonder why chemistry and physics teachers harped about units? Because if you don't include them and understand them you will mess up and lead someone astray. You're half right.