1T v 2T

[Bmsh]

right my memory is running 2T at 200mhz which equals 400Mhz right? if was running on 1T would be need to be set at 400Mhz? Just a learning noob. Im not trying to change it or anything just trying to make sense of numbers and how things work.

 

[Hurin]

Woops! No, you're thinking that 1T and 2T command rate has something to do with clock speed. But they are not related. Going from 1T to 2T does not make your RAM go from 400MHz to 800MHz. They are independent settings.

Edit: 1T vs 2T (command rate) is considered a RAM "timing" along with those other esoteric numbers you see ("4-4-4-12 or 5-5-5-15, etc.). Those are generally set to "fine tune" the speed of your system and generally does not have a huge effect.

There is another way to speed up your RAM and that is to change the frequency (clock speed) at which your RAM is operating. This is generally considered to be the major indicator of RAM speed while "timing" (above) would be the "fine tuning." Clock speed/frequency is where you see numbers like 800MHz or 1066MHz, etc.

 

[BinarySynapse]

right my memory is running 2T at 200mhz which equals 400Mhz right? if was running on 1T would be need to be set at 400Mhz? Just a learning noob. Im not trying to change it or anything just trying to make sense of numbers and how things work.

No your ram always runs at 200MHz (as long as it's set to 200MHz). Since it's DDR it transfers data twice per clock (MHz) which makes it effectlively 400MHz. The 1T or 2T is how many of those clock (MHz) go by before the memory controller can send a command to the memory chips.

 

[Bmsh]

ok i get it thanks, just tryin to figure how the clock speed and output speed matched up. so ddr2 has 4 transfers per clock, so at ddr2-400 its clockspeed would be 100Mhz? this right?

 

[BinarySynapse]

ok i get it thanks, just tryin to figure how the clock speed and output speed matched up. so ddr2 has 4 transfers per clock, so at ddr2-400 its clockspeed would be 100Mhz? this right?

Nope DDR2 is still two per clock. DDR means Double Data Rate. Double of what you ask? Double the clock speed.

 

[Bmsh]

finally there lol thanks

 

[Jakalwarrior]

DDR2 is just a different type of DDR that clocks higher and fits in a different socket. 2t does make a pretty big difference in memory bandwidth. The amount that it helps in the real world depends on how big of a bottleneck your ram bandwidth was before. On my system it makes a 20% or greater bandwidth difference. In the computer world being 20% faster is often a pretty huge price point difference. Not all systems react the same to 1t vs 2t though. My intel system didn't seem to care as much but it was still a pretty big bandwidth difference.