Hi, I Installed 8GB Ram of Corsair 3200mhz in my pc but it is showing 6.93 usable and 2133mhz only. I am using ASRock B450m Pro4 as motherboard. Kindly advise to fix this. Thank you.
A portion of ram is reserved for OS system use. The lower speed is probably the base speed, you can check that on Corsair website.
To get the higher speed enable XMP in motherboard bios (instructions in manual).
Adding to what Goodplay mentioned, if you are using a APU then some RAM is also reserved for the Integrated Graphics. The Integrated Graphics RAM amount can be adjusted via BIOS setting.
Further adding to this, the former overclocking features were referred to a DOCP xmp profile for the ram. This should be pretty easy to find in the bios and set. Looking in manual DRAM timings frequency drop down boxes. Sometimes the xmp profiles show up at the bottom of the DRAM timing drop down boxes because numbers come before letters in ASCII alphabetical ordering.
B450 should handle this just fine. If you've got lingering unapplied bios updates, then apply the latest one.
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