RAM speed

[kelrin]

I am thinking to upgrade my RAM.

Here is what Linux tells about my current module:

Handle 0x003C, DMI type 17, 40 bytes
Memory Device
  Array Handle: 0x003A
  Error Information Handle: Not Provided
  Total Width: 64 bits
  Data Width: 64 bits
  Size: 8192 MB
  Form Factor: SODIMM
  Set: None
  Locator: DIMM B
  Bank Locator: BANK 2
  Type: DDR4
  Type Detail: Synchronous
  Speed: 2400 MT/s
  Manufacturer: Micron
  Serial Number: 128BADF8
  Asset Tag: 0F161800
  Part Number: 8ATF1G64HZ-2G3B1 
  Rank: 1
  Configured Clock Speed: 2133 MT/s
  Minimum Voltage: 1.2 V
  Maximum Voltage: 1.2 V
  Configured Voltage: 1.2 V


Why does "speed" and "configured clock Liteblue speed" differ?

[az2020]

Maybe the computer can't run at 2400? The memory can, but is only being used at the speed the computer can do?

If you go to Crucial's web site you can usually find your computer model. Crucial will tell you the memory that's compatible with your computer. That might suggest something about the memory you have now. You probably know this: if you're adding a module to an unused slot, it should be the same. You might not get dual-channel performance if they differ in some ways. How sensitive might vary from one computer model to another. I don't know much about these things. I try to get the same part number. Or, same speed, rank, density (x4, x8, x16), etc. Getting the exact same module is obviously the best option to ensure they play well together. But, it's probably ok to mix modules if their spec'ed similarly. How similar it has to be probably varies from one computer to another.