The first number is the CAS latency. The second number is the TRCD. The last number is the TRP

CAS means Column Address Strobe. The Webster's Dictionary defines latency as "the interval between stimulus and response" just in case that word isn't familiar to you.

This controls the timing delay (in clock cycles) before the RAM starts a read command after receiving it. Settings are usually 2 or 2.5 This setting has more affect on system performance than any other RAM setting. Since this is the number of cycles the CAS needs to find the correct address of the data that it is looking for. That is why your entire system runs quite a bit faster when the data can be fetched in 2 cycles rather than 2.5

for oc use 5-5-5-15-20-2T rather 4-4-4-12-18-1T but also depends on the capabilities of the ram

This post has been edited by KenLee: Aug 23 2007, 01:32 AM

1T or 2T, but that only available on nvidia chipset mobo, or maybe my intel 975 n my previous 965 can't let me select... to proper gain performance from oced ram, higher frequency with good close CAS latency is very important... ther r rams can do 800mhz with CAS3, team extreme for 1... n some manage to do 1000mhz with CAS4 with the same ram...

the mobo i'm using right now allow me to change the command rate after upgrade to the latest bios, but is it really big difference between 1T and 2T?