Austin vor 2 Tagen (bearbeitet)
This is a very complex topic that is hard to encapsulate in a Youtube comment section. Keep in mind it is well known that:
4 sticks of RAM in Ryzen's Daisy-chain Topology is much less stable than 2 sticks, in almost every instance (this actually made it so the most popular Ryzen kit out there, the Trident Z Neo 3600 CL 16-19-19-39 kit wouldn't even run in 4x8 mode on my friend's x570 board without upping the voltage from 1.35 to 1.38)
Dual-rank kits (memory chips on each side of the memory stick) can behave like dual-channel in a single stick, which is why dual-rank kits in 2x16 are often considered more stable and higher performers than single-rank kits (memory chips on one side of the stick) in 4x8.
Micron is the world's number 1 supplier of memory chips, and only recently started making 2gb memory chips available on lower-capacity kits, meaning that there are 2 or 3 kits of Crucial using 16gb in single rank, meaning 8 2gb chips on one side of the stick, 0 on the other. This means you can use all 256 bits of memory bandwidth in a 64gb, 4 stick configuration(16x4 of this particular memory), where as before using 16x4 kits for 64gb where each memory chip was 1gb meant that each stick was dual-rank (8 1gb chips on one side, 8 1gb chips on the other for a total of 16gb per stick), which is 512-bit, and can overload the Ryzen memory controller, and lower performance. Threadripper, with it's quad-channel, supports 512-bit, and therefore high-capacity, dual rank kits.
The problem is, at the moment, most kits are using the 1gb chips still, so if you buy kits that use 8gb sticks, you are getting single-rank sticks, which perform worse on average than dual-rank kits, which don't exist lower than 16gb/stick anymore, meaning a 32gb 2x16 dual-channel kits is the lowest capacity for this configuration.
As 2gb chips become more and more common, even 16gb sticks in 2x16 dual channel kits are going to become single rank, which theoretically lowers the performance based on the benefit of the dual-rank versus single-rank.
TL;DR -
1) if you go for 32gb kits in 4x8, you are reaching full memory controller capacity (256 bits), but with less stable memory settings, due to both using 4 sticks instead of 2, and single-rank instead of dual.
2)if you go for 16gb kits in 2x8, you are reaching HALF memory controller capacity (128 bits), but more stable OC settings due to 2 sticks of RAM, but less overall performance from using single-rank instead of dual.
3) 32gb in 2x16 for almost any kit out there (except the new and slowly-becoming-more-common 16gb Crucial single-rank kits), you are hitting both the best stability with number of ram sticks, and the best memory controller capacity (256 bits)
P.S. - If you are looking for 'high frequency, low latency' kits, you are going to be hard-pressed to find high capacity kits, because it's much more difficult to get 16gb sticks of RAM stable at the same settings as 8gb Sticks. Trident is releasing a 32gb, 2x16, 3800 CL14 kit in Q4, which is near the top of the stack for 16gb Module performance
Quelle
https://www.youtube.com/channel/UCiNgQjEnk8gN7a58UyUFdoQ
Man könnte also nur entweder Dual Rank oder Dual Channel haben.
