Question What Memory Can I Add?

Nov 17, 2020
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This from my motherboard manual:

4x DDR4 memory slots, support up to 128GB*
▪ 3rd Gen AMD Ryzen™ Processors support DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 Mhz by JEDEC, and 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466/ 3600/ 3733/ 3866/ 4000/ 4133/ 4266/ 4400/ 4533/ 4600+ Mhz by A-XMP OC MODE
▪ 2nd Gen AMD Ryzen™ Processors, 1st and 2nd Gen AMD Ryzen™ with Radeon™ Vega Graphics Processors support DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 Mhz by JEDEC, and 2667/ 2800/ 2933/ 3000/ 3066/ 3200/ 3466+ Mhz by A-XMP OC MODE

∙ Supports 1DPC 1R max speed 4600 MHZ
∙ Supports 1DPC 2R max speed 3866 MHZ
∙ Supports 2DPC 1R max speed 4000 MHZ
∙ Supports 2DPC 2R max speed 3600 MHZ
If it says 1DPC, does this mean 1 stick in total? Or 1 stick per channel (2 in total)?
What does the '1R' or '2R' mean?

(Ryzen 9 3900X / MSI Tomahawk X570)

I currently have 2 x 16GB DDR4-3600C18, but wandering if I can get faster RAM to improve gaming FPS.
 

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