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AMD Ryzen RAM scaling - performance effect in games
Posted by: on: 06/19/2020 01:08 PM [
84 comment(s) ]
The impact of memory timings and frequency on AMD Ryzen 3000 systems in games has been a topic of discussion. In this article we'll zoom in on specifically that. See, AMD made a change in 3rd generations Ryzen, aka "Zen 2" processors, splitting the memory controllers from the die that contains CPU cores. The DDR4 memory controller is located in the processor's 12 nm I/O controller die.
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JamesSneed
Senior Member
Posts: 1126
Senior Member
Posts: 1126
Posted on: 06/19/2020 02:36 PM
On the single rank vs double rank test the 4x8 GB DIMM's will be dual-rank as far as the memory controller is concerned because you have two single rank DIMM's per controller. The only true single rank is the 2x8 test because its a single rank DIMM per memory controller. This is why the single rank(2x8GB) is the only one that suffers while the other three are within a 2% margin of error. The short version is to populate all 4 DIMM's on Ryzen because it seems to offer better performance regardless if you have dual or quad rank per memory controller. This has been the case since first generation Ryzen as well.
On the single rank vs double rank test the 4x8 GB DIMM's will be dual-rank as far as the memory controller is concerned because you have two single rank DIMM's per controller. The only true single rank is the 2x8 test because its a single rank DIMM per memory controller. This is why the single rank(2x8GB) is the only one that suffers while the other three are within a 2% margin of error. The short version is to populate all 4 DIMM's on Ryzen because it seems to offer better performance regardless if you have dual or quad rank per memory controller. This has been the case since first generation Ryzen as well.
mannix
Member
Posts: 59
Member
Posts: 59
Posted on: 06/19/2020 02:53 PM
Maybe a review from 1usmus before publishing would have been helpful
The Aorus X470 Gaming 7 WIFI is a board with T-Topology layout...
These recommendations are not going to be good for boards with Daisy chain layout (almost all X570).
Especially the 4 sticks with Dual Rank, hard to have them working with low timings and/or high clock.
Also it should have been mentioned Gear Down mode, what it means, what it does, etc
Maybe a review from 1usmus before publishing would have been helpful
The Aorus X470 Gaming 7 WIFI is a board with T-Topology layout...
These recommendations are not going to be good for boards with Daisy chain layout (almost all X570).
Especially the 4 sticks with Dual Rank, hard to have them working with low timings and/or high clock.
Also it should have been mentioned Gear Down mode, what it means, what it does, etc
JamesSneed
Senior Member
Posts: 1126
Senior Member
Posts: 1126
Posted on: 06/19/2020 02:55 PM
Maybe a review from 1usmus before publishing would have been helpful
The Aorus X470 Gaming 7 WIFI is a board with T-Topology layout...
These recommendations are not going to be good for boards with Daisy chain layout (almost all X570).
Especially the 4 sticks with Dual Rank, hard to have them working with low timings and/or high clock.
Also it should have been mentioned Gear Down mode, what it means, what it does, etc
Very good point about the change over to daily chain.
Maybe a review from 1usmus before publishing would have been helpful
The Aorus X470 Gaming 7 WIFI is a board with T-Topology layout...
These recommendations are not going to be good for boards with Daisy chain layout (almost all X570).
Especially the 4 sticks with Dual Rank, hard to have them working with low timings and/or high clock.
Also it should have been mentioned Gear Down mode, what it means, what it does, etc
Very good point about the change over to daily chain.
schmidtbag
Senior Member
Posts: 5634
Senior Member
Posts: 5634
Posted on: 06/19/2020 03:08 PM
Interesting... seems Zen2 is a lot less bandwidth-hungry than 1st gen.
Also, great to see the mins and average FPS. I hope to see that more in future benchmarks.
Interesting... seems Zen2 is a lot less bandwidth-hungry than 1st gen.
Also, great to see the mins and average FPS. I hope to see that more in future benchmarks.
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Senior Member
Posts: 140
Thanks a lot for this very welcome article.