Re: RAM Questions?
1. Cas Latency basically refers to the number of clock cycles your memory will take to complete a task, and the is split into four figures.
tRas (also known as the RAS pulse width or simply called the cycle time is the number of clock cycles that your memory will take to close after its been activated so that it can be written again. The tRAS should be just a little bit higher than your CAS + TRCD + 2 depending on your module.)
tRCD (also known as RAS to CAS delay) THis addresses work in terms of rows and columns of numbers. It is simply the number of clock cycles that your memory will take to get a column address from the cpu after its recieved the row address.)
tRP (known as RAS precharge is the time your memory will take to activate a row after a precharge command. A precharge command is basically an instruction to charge up its storage capacitors. Your memory will get to work quicker the lower this number is.
4th And last is the CAS (column address strobe which is the most important of the latency settings and the most quoted. This is the system setting that will make your ram noticeably quicker or slower as well as making it crash if its set to low. This is the number of clock cycles that your memory will take to start working on a read command after it's recieved all the other info from your other commands.
This scale would look like this tRCD 4, tRP 4, CAS 4, tRAS 12 or normally seen as 4,4,4,12 in sig's.
2. Answered above the lower the better.
3. Voltage I believe this is similar to CPU's. The higher the voltage normally the lower you can get the timings and overclock the ram. If it runs at a lower voltage it can't overclock as high.