I just installed new RAM in my computer. The RAM (below) is 800Mhz CL5. My mobo only supports 533Mhz. It didn't boot upon first installation, so I changed the frequency to 400Mhz. It boots well now and my monitoring software says that it's running at 400Mhz CL3. Is 533Mhz CL5 faster or is 400Mhz CL3 faster? Should I try to get it to work at 533Mhz or is it fine. Also, does this sound like the RAM may have a problem?
As a quick generalization, every 133-150Mhz change in your RAM frequency is roughly equivalent to one stop of CAS Latency in the access time of your data. As such, your RAM running at 400Mhz CL3 will return data faster than when it runs at 500Mhz CL5. You should try and manually set the speed, timings and voltage in the BIOS if possible.