AMD Zen 3 aka Ryzen 5xxx CPUs

Vitaliy_Kiselev

Some unusual statements that can be result of Huawei band

Vitaliy_Kiselev

AMD backpedalled to support this CPUs on 4xx series MB, but specially used it as trick to avoid making support on 3xx series.

We recently announced that we would not support “Zen 3” on AMD 400 Series motherboards due to serious constraints in SPI ROM capacities in most of the AMD 400 Series motherboards. This is not the first time a technical hurdle has come up with Socket AM4 given the longevity of this socket, but it is the first time our enthusiasts have faced such a hurdle.

Over the past week, we closely reviewed your feedback on that news: we watched every video, read every comment and saw every Tweet. We hear that many of you hoped for a longer upgrade path. We hear your hope that AMD B450 and X470 chipsets would carry you into the “Zen 3” era.

Our experience has been that large-scale BIOS upgrades can be difficult and confusing especially as processors come on and off the support lists. As the community of Socket AM4 customers has grown over the past three years, our intention was to take a path forward that provides the safest upgrade experience for the largest number of users. However, we hear you loud and clear when you tell us you would like to see B450 or X470 boards extended to the next generation “Zen 3” products.

As the team weighed your feedback against the technical challenges we face, we decided to change course. As a result, we will enable an upgrade path for B450 and X470 customers that adds support for next-gen AMD Ryzen™ Processors with the “Zen 3” architecture. This decision is very fresh, but here is a first look at how the upgrade path is expected to work for customers of these motherboards.

We will develop and enable our motherboard partners with the code to support “Zen 3”-based processors in select beta BIOSes for AMD B450 and X470 motherboards.

These optional BIOS updates will disable support for many existing AMD Ryzen™ Desktop Processor models to make the necessary ROM space available.

The select beta BIOSes will enable a one-way upgrade path for AMD Ryzen Processors with “Zen 3,” coming later this year. Flashing back to an older BIOS version will not be supported.

To reduce the potential for confusion, our intent is to offer BIOS download only to verified customers of 400 Series motherboards who have purchased a new desktop processor with “Zen 3” inside. This will help us ensure that customers have a bootable processor on-hand after the BIOS flash, minimizing the risk a user could get caught in a no-boot situation.

Timing and availability of the BIOS updates will vary and may not immediately coincide with the availability of the first “Zen 3”-based processors.

This is the final pathway AMD can enable for 400 Series motherboards to add new CPU support. CPU releases beyond “Zen 3” will require a newer motherboard.

AMD continues to recommend that customers choose an AMD 500 Series motherboard for the best performance and features with our new CPUs.

Vitaliy_Kiselev

Remove this private property owners and "efficient management" and you will never have such.

Vitaliy_Kiselev

AMD disclosed that its upcoming "Zen 3" 4th generation Ryzen desktop processors will only support AMD 500-series (or later) chipsets. The next-gen processors will not work with older 400-series or 300-series chipsets. This comes as a blow to those who bought premium X470 motherboards hoping for latest CPU compatibility running into 2020.

AMD is now behaving exactly like Intel.

Vitaliy_Kiselev

Vitaliy_Kiselev

Vitaliy_Kiselev

Many have suggested that Zen 3 would deliver higher IPC gains than Zen 2 (based on what AMD has said) and would feature greater than 32 MB of L3 cache per compute die (based on the aforementioned leaked presentation). Some of my sources have suggested a 20% IPC bump, but according to our new leak the IPC gain is only 10-15% on a single thread, just on par with Zen 2. This IPC improvement comes largely from a reworked front end. IPC could improve in multi threading, however, as Zen 3 will benefit from the improved CCX.

Additionally, Zen 3 will double the L3 cache per CCX, but since there is now only 1 CCX per compute die instead of 2, the level of L3 cache remains the same at 32 MB. Unfortunately, there will be no 48 MB or 64 MB L3 caches with Zen 3, which I’m sure is disappointing for some.

https://adoredtv.com/exclusive-zen-3-to-feature-10-15-increased-ipc-32-mb-of-l3-cache-per-ccx/

Vitaliy_Kiselev

AMD has promised that its Zen 3 architecture be introduced later this year, while consumer CPUs powered by the Zen 3 architecture will arrive in March 2021.

Rumors are that it is huge issues with 7nm+, partially EUV, process at TSMC.

Most probably resources will be rerouted to usual 5nm specially for Apple and all other products will be postponed.

Vitaliy_Kiselev

in mixed operations that leverage both integer and floating-point units of the Zen architecture, Zen 3 could deliver a 17% IPC gain on average. It is also stated that the integer ops are getting a 10-12% increase on average while the floating-point operations could feature up to a 50% increase in performance.

Again this same +17% rumor. +17% will be only in special benchmarks that AMD will prepare for reviewers (ones that do not use DRAM and will use more cache then Zen 2 has).

Vitaliy_Kiselev

Another rumors suggest that AMD abandoned or disabled SMT4 in Zen 3, despite original plans.

This happened due to thermal issues it caused.

Vitaliy_Kiselev

New rumors propose correct 100-200Mhz gain (at best!)

But absolutely idiotic +17% IPC.

Of course, AMD will do everything to properly select tests and use such that will get good gain from new cache size and architecture.

But real IPC won't change much.

Vitaliy_Kiselev

x670 chipset can be again outsourced to ASMedia, as AMD seems unable to make anything good.

x570 has lot of issues, horrible heat management, plus AMD matched it's price to reach Zen profits (I mean >300%).

Only improvements will be upgrade of all lines provided by chipset to PCIe 4.0 lines.

Chipset also will have config allowing to set it to 8 PCIe lines connection to CPU for usage in new TRX Threadripper boards (same way now remarked x570 is used for such).

Vitaliy_Kiselev

New rumors update.

AMD plans to shift Ryzen 3 to Q4 of 2020, can happen that even to Q1 of 2021.

Main reason being TSMC issues with 7nm process and not enough speed of pumping up even original 7nm.

EUV 7nm is very questionable, you can see unfounded claims of 20% density improvement, but rumors are that it will be focused on mobile chips and won't bring anything good for desktop chips, and can come even with degraded top frequencies and worst thermal issues.

AMD will also release new Х670 chipset with price being +30% compared to x570 (that is extremely expensive).

Vitaliy_Kiselev

AMD's Zen 3 architecture is set to launch next year and if this rumor pans out it will bring no less than 8% greater performance per clock vs current Ryzen 3000 series processors.

Early Zen 3 engineering samples are able to operate at roughly 200Mhz higher clock speeds compared with the company's early Zen 2 engineering samples

Reality will be such - 2-4% IPC increase, may be another 3-4% from shared cache in benchmarks.
Same frequencies, except 1-2 top models that will cost around 30% extra for 100-200Mhz premium.

Vitaliy_Kiselev

AMD made special controlled leak considering Zen 3 chiplets

Number of cores and general architecture will be kept the same
Progress will slow down a lot with around 2-5% real performance increase compared to current gen
Main marketing trick will be 4 way SMT per one core. Such thing is efficient only is certain tasks.
For some software due to SMT we will actually see drop in performance as each virtual core will have less real resources

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