Mixing RAM Latency (CL)?

Well, the other answers have me baffled as I have already experienced what happens when I put in mixed sets of RAM into a system, one or both never works. The latency of the RAM will do no good as the higher number will always counter the lower and do all the work, or neither will work at all.

It is wise because the programming of your OS system is designed to pick up, register, and allow to work only the same identical sets of RAM that is sees.

If you have a pre Vista era OS you would only be allowed to use up to 4GB of RAM and the two chips must match identically. Vista or Windows 7 would recognize RAM higher than 4GB as it is a 64 bit system and allow for the use of the RAM but if they are mixed it would still only see the predominant chip.

553ghz, 667ghz, 800ghz, 1066ghz, are the most common and you need to be aware you run the risk of a system failure so long as the ram doesn't match.

Column address Strobe (CAS) latency, or CL, is the postpone time between the 2d a memory controller tells the memory module to get admission to a particular memory column on a RAM memory module, and the 2d the documents from given array area is obtainable on the module's output pins. in many cases, the decrease the CAS latency, the extra helpful. in many cases it is going to be set to 2 or 3. try 2 and spot what happens. Set to 3 if there seems to be issues.

Yes, you can mix latencies, but you'll need to set your bios to run at the higher (slower) of the two values, CL6 in your case.

Is the new RAM rated at the same speed as your old RAM? CL#s usually go up with MHz, but if you're running the memory below its maximum rated speed, it can handle a lower (faster) CL number.

If I recall correctly, it is possible to mix the latency of ram, but the faster ram will usually assume the latency of the slower one. This defeats the purpose of spending the money on the faster ram though.

You may want to make sure voltages are the same for both types, a difference in that may cause problems.