I used my computer's BIOS to find the serial number for the 8gb DDR4 ram stick the computer came with, and then I bought an identical twin from the internet. The only difference between the two is that the one I bought was produced a few weeks prior to the one I had already.
The serial number is M471A1G43DB0-CPB from Samsung.
I first installed in DIMM1 and tested with BIOS Memory Extensive check, Memtest86 and then Prime95; both cards show equal performance independently, with zero errors. I have used CPU-Z, HWiNFO64, BIOS etc. and I am getting the numbers I am supposed to be getting: 2133MHz or 1066MHz, 16GB or 15.9GB, 2 ranks etc. All the numbers describing the details of the cards are the same, as I expected. However, my PC feels slower than before. Maybe I'm looking at the wrong numbers? If I wanted to take an objective measurement of how fast my PC with one card vs. twin cards, what numbers should I be looking at?
The serial number is M471A1G43DB0-CPB from Samsung.
I first installed in DIMM1 and tested with BIOS Memory Extensive check, Memtest86 and then Prime95; both cards show equal performance independently, with zero errors. I have used CPU-Z, HWiNFO64, BIOS etc. and I am getting the numbers I am supposed to be getting: 2133MHz or 1066MHz, 16GB or 15.9GB, 2 ranks etc. All the numbers describing the details of the cards are the same, as I expected. However, my PC feels slower than before. Maybe I'm looking at the wrong numbers? If I wanted to take an objective measurement of how fast my PC with one card vs. twin cards, what numbers should I be looking at?