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AMD has an 8 core eng. sample, with DDR4 running at 5000mhz+ (1t)

g67575

g67575

g67575

Soldato
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30 Jun 2019
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There is apparently an 8 core ES CPU from the Cezanne family (on AM4) that supports higher speed DDR4, link here:
https://www.chiphell.com/thread-2303276-1-1.html

Clock frequency is 4.6ghz, so it could be an APU or CPU model, e.g Ryzen 5700?

If it's true, it does make you wonder if AMD will want to make the move to DDR5 quickly, or if it will be a similar to Alder Lake, with some motherboards still using DDR4, at higher speeds.

Might be a good idea for people looking at buying a 5800x to wait a few months for more news / or releases, if higher DDR4 RAM speeds are on the cards.
 
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Rocket Lake will look like a complete joke if AMD can release CPUs in the coming months with support for ~5000mhz RAM, vs 3200mhz at gear 1 for Intel's 11th gen.
 
Journey said:
What the obsession with you and RAM speed @g67575 ?

There's no point in having 5000MHz DDR4 as there are so few modules that can do it easily, and the benefit lessens as you have to slacken the timings, and pure bandwidth isn't ideal in most situations. Bigger numbers aren't always better, you'll learn that in the PC space eventually.
Click to expand...

Don't agree, its actually a pretty linear performance gain on DDR4 (as the frequency increases), particularly in real world applications like games, and things that benefit from higher memory bandwidth.

You can also see the RAM to CPU latency coming down as the frequency is increased (in programs like Aida64). This is something AMD has generally been behind Intel on.

It's not really an obsession, I'm just trying to think ahead, to save money. Who wants to buy RAM twice?

If you are talking about DDR5, I expect that will be a whole different kettle of fish performance wise, and may take some time to overtake high end DDR4 modules.

High end DDR4 modules would give AMD an even greater performance advantage vs Rocket Lake.

I do agree that there's an optimum price / performance ratio for DDR4, at the moment I'd be hesitant to get above DDR4 4000mhz, because of the large price increase above 4000mhz, but I think that could change quickly this year.
 
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DDR5 (desktops) will be available in 2022, with compatible motherboards. Only the 'Z' series Intel motherboards will support it. We have no idea what AMD plans for DDR5, yet.

Where does it say the memory controller / IMC is running at 2:1 1:2?
 
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Oops I see it now... Couldn't it just be that the Ring/cache clock is very low because it's an engineering sample.

If the final product's IMC ran at 1:2 (rather than 1:1), Ram clocked at 5000mhz would be pointless.
 
I remember now, with AMD CPUs, the infinity cache clock, and memory controller clock are tied together...

Intel has a separate Cache/Ring ratio that can be set.

I see no reason why the cache frequency / IMC clock couldn't be improved for the Zen 3 refresh retail versions, though.
 
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