6-2-2-2.0 1t<---what does the 1t mean?

Was looking on Kingston for my pc3000 ram ratings can't find out what that 1T thing is

Thank you in advance for your time

command rate

Is that a setting?
I can't seem to find it I have the first 4 but not the last one from what I can see

usually 1T increases performance slightly, but many times it also makes ram unstable.

i have khx pc3000, and i run it at 2T command, and it seems stable. i run 193 fsb, so, i'm not using any extreme speed, but i am close.. this ram will , however, run 1T at it's rated fsb.......

for me, i think the performance gain is minimal, for the potential instability that i may get.......usually i get corruption at 196fsb, and higher...in my rig.