First post :-)
Good price for memory if you want two 8gb sticks. Also sold individually but the deal is for the bundle!
Crucial 8GB DDR4 3200 MT/s (PC4-25600) SODIMM 260-Pin Memory - CT8G4SFRA32A
I can't help with questions about RAM I just stumbled across this after buying two used sticks at nearly the same price!
I'm not sure if they are R8 or R16 (about 20% difference in speed I think).
Specs from a previous post:
1Rx8:
https://www.memorybenchmark.net/ram.php?ram=Crucial+Technolo…
1Rx16:
https://www.memorybenchmark.net/ram.php?ram=Crucial+Technolo…
If you have a 10th gen (rather than 11th) Intel CPU, check your motherboard spec, the RAM probably can only run at 2666MHz.