You need to dumb this down for me please
I get the low power part but that’s about it
It's okay. I was caught off-guard by the 10x and 10y thing.
Apparently, DRAM manufacture is "stuck" on a 10nm node. So node refinements are all they can achieve. I don't know all the technical details behind it. Anyway, DDR4 as we know it is manufactured on the older 10x node. 10y node should feature higher speeds and lower voltages. There is a vanishingly small amount of 10x DDR4 that can bin for DDR4-5000, but 10y should be a different story.
I myself am sitting on some 10x DDR4-4400 which should be "good enough" for me until DDR5 hits the scene. I hope!
Whole another thing is, what will be actually faster, a CPU with 5000MT/s ram and 1250Mhz IF or a chip with 3733MT/s ram and 1866 IF...
That is something I hope to test. Not sure if my RAM will be up to DDR4-5000 or not, but if Zen2 can handle the XMP settings then I can at least test DDR4-4400. Higher IF speeds will equal lower IF latency, which should in turn improve performance for any workload where intercore latency is a concern.
Small technical point, IF runs at the actual clock rate of DDR. Not half.
Actually, no. Check this out:
https://www.transcend-info.com/Support/FAQ-296
JEDEC members have been employing tricks over the years to increase data transfer rate without (necessarily) increasing memory clocks. For example, DDR4-3200 operates at only 200 MHz internally. On a Ryzen system running DDR4-3200, the IF frequency is 1600 MHz, which is eight times that of the memory clock. IF is actually linked to the memory bus clock in this circumstance. If we want to be technical, then, there you have it.
It appears as though most Summit Ridge chips crapped out at an IF speed of around
1066-1233 1733 MHz. Pinnacle Ridge was a bit better, hitting speeds of 1800 MHz for a non-trivial number of overclockers. I am hoping Zen2 can manage at least 2000 MHz IF.