Question Officially supported RAM speed with AMD CPUs ?

[Hyedwtditpm]

I see that some AMD official advice is to use 6000mhz RAM with the new 8700G CPUs, also for other latest generation AMD CPUs. But the thing is that on AMD's product page for the 8700G, the supported RAM speeds are:

Max Memory Speed
2x1R DDR5-5200
2x2R DDR5-5200
4X1R DDR5-3600
4x2R DDR5-3600
https://www.amd.com/en/products/apu/amd-ryzen-7-8700g

So if the officially supported ram speed is 5200mhz, I don't understand why they advise 6000mhz rams.
This is my production computer so while the speed is important, stability is even more important, I dont want to overclock run the risk of instability.

What are the officially supported, guaranteed to work speeds for 8700G and Amd R7900X, does anyone know?

 

[kerberos_20]

listed speeds are officialy supported on every CPUs even on bad bins with poor memory controller combined with cheapo mainboard

 

[Ralston18]

Perhaps (from the amd link above) via the small blue "i" next to "Unlocked for overclocking":

"AMD`s product warranty does not cover damages caused by overclocking, even when overclocking is enabled via AMD hardware and/or software. GD-26."

Just a way of saying, I think, that "we can go faster (or faster than CPU = X ) but you better not do so....."

And more MHz's might work for while before endingly badly. But it does work...

Cynicism conceded.

 

[Hyedwtditpm]

Thanks for the replies.

Only ram I could find that has both Intel Xmp and Amd Expo support is from Kingston. It has inbuilt profiles for both 5600mhz and 6000mhz. Looks like this will be a good option since I plan to upgrade the CPU later.

is there any other brand, model similar, alternative to this?

https://www.kingston.com/en/memory/gaming/kingston-fury-beast-ddr5-memory

 

[CountMike]

Thanks for the replies.

Only ram I could find that has both Intel Xmp and Amd Expo support is from Kingston. It has inbuilt profiles for both 5600mhz and 6000mhz. Looks like this will be a good option since I plan to upgrade the CPU later.

is there any other brand, model similar, alternative to this?

https://www.kingston.com/en/memory/gaming/kingston-fury-beast-ddr5-memory

BIOS versions are often upgraded to match new RAM speeds and settings. With AMD it's AGESA code that governs it.

 

[CountMike]

It would take helluva pushing with high voltages for that to happen, never heard about it.

 

[PiersPlowman]

It would take helluva pushing with high voltages for that to happen, never heard about it.

Thing is, XMP does jack up the voltages. Thuban was notorious for kicking the bucket at the sight of 1600 RAM, and early Zen 2 was not especially robust, either.

 

[CountMike]

Thing is, XMP does jack up the voltages. Thuban was notorious for kicking the bucket at the sight of 1600 RAM, and early Zen 2 was not especially robust, either.

Correction, XMP MAY jack up voltages , always seen as 1.1v firmly set. Phenom II is distant past, they didn't have memory control chip. What pushes IMC hardest is using both channels at high speeds. Then it becomes cooling problem. Ryzen 5000 series solved that too (mostly)

 

[kerberos_20]

Correction, XMP MAY jack up voltages , always seen as 1.1v firmly set.

vsoc yes 1.1v is plenty enough for high clocks, but both CLD0 and VDDG ranges between 0.9v-1.05v based on bin quality at desired clock (for FCLK/UCLK)

Thing is, XMP does jack up the voltages. Thuban was notorious for kicking the bucket at the sight of 1600 RAM, and early Zen 2 was not especially robust, either.

even if you jacked up memory clock on AM3 CPU, it wouldnt do anything at all, it was bottlenecked by uncore frequency which didnt autoscale with XMP, so you had to manualy overclock northbridge to take memory overclock in effect

whats wrong with early zen2? i sill have 3800x stepping 0, pretty decent for memory overclock, got 3733MT/s on it with old x370 mobo rated for 3200...
clock could go higher...but infinity fabric was already having issues,it didnt like 1866MHz and i didnt want to go over 1.0v

zen3 stepping B2 got much better infinity fabric, 1900MHz at just 0.95v on both IMC and fabric, which is in line with what google throws from others...

and looking through google images on zen4 voltages...IMC (CLDO) is still up to 1.05v as on older platform, (if we exlude old ASUS pictures with crazy voltages lol)

 

[PiersPlowman]

whats wrong with early zen2? i sill have 3800x stepping 0, pretty decent for memory overclock, got 3733MT/s on it with old x370 mobo rated for 3200...
clock could go higher...but infinity fabric was already having issues,it didnt like 1866MHz and i didn't want to go over 1.0v

I am going by AMD's own specs and pushing back against the belief that one can just dial in a number and expect it to work. AMD's Zen 2/3 IMC is guaranteed to work at speeds up to 2667 / 2993 / 3200 depending on configuration. The more sticks / ranks the RAM has, the slower it will be run.

Now what do we mean by "works"?

I) The system runs normally, without error, and for a period exceeding the useful life of the hardware.
ii) The system runs normally, without error, for a period less than the useful life of the hardware.
Iii) The system works with errors.
Iv) The system doesn't work.

For me, only the first outcome is acceptable. In another recent post on the board, we have a user experiencing the second outcome.

But if you know the risks and are happy with what you are doing, you do you. It's your money.

 

[Kona45primo]

AMD push the higher RAM speeds so you degrade the IMC and are forced to get a new CPU. Usually this happens just after the 3 year warranty period ends.

Any proof to back that up? Does the apply to Intel as well? Their 14900k supports 5600mhz, but all of their benchmarks have it running memory exceeding that by a larger margin than AMD

 

[PiersPlowman]

Any proof to back that up? Does the apply to Intel as well? Their 14900k supports 5600mhz, but all of their benchmarks have it running memory exceeding that by a larger margin than AMD

Ha. I am just cynical about AMD (and others) making exaggerated claims about their hardware in one breath while issuing disclaimers in another. The old adage "put your money where your mouth is" springs to mind and neither AMD nor Intel do this. Veteran systems builders know the score, but to noobs XMP is not obvious overclocking. I don't think we should be endorsing the corporate line on this.

 

[CountMike]

Ha. I am just cynical about AMD (and others) making exaggerated claims about their hardware in one breath while issuing disclaimers in another. The old adage "put your money where your mouth is" springs to mind and neither AMD nor Intel do this. Veteran systems builders know the score, but to noobs XMP is not obvious overclocking. I don't think we should be endorsing the corporate line on this.

Disclaimers are to save their a$$ets so to speak. Intel K advertise for overclock but if you do,it's on you. Same for other components, MBs friendly for OC but if something burns out,don't look at us, it's your problem. XMP, technically an OC but still advertised for top speed/frequency. if you use it and something gives up magic smoke, don't take our word for it.