AMD Radeon RX 6800 XT Tested on Z490 Platform With Resizable BAR (AMD's SAM) Enabled

[olstyle]

Clearly not, as if you did, you would've know why it won't come to older AMD CPUs. AMD doesn't support the instruction needed.
Maybe read the full twitter thread linked to above if the explanation here wasn't good enough, or the Wikipedia link provided above.

https://twitter.com/x/status/1331853611043856389

From above twitter thread.
View attachment 178091

As I wrote before: Where is the connection between those instructions and large Addressing? That those are now way faster is no news to me since I read the Anandtech test, but there was no connection to resizeable BAR made there.

 

[TheLostSwede]

As I wrote before: Where is the connection between those instructions and large Addressing? That those are now way faster is no news to me since I read the Anandtech test, but there was no connection to resizeable BAR made there.

You clearly didn't read the thread on twitter then. It explains that the instructions are needed to encode/decode the data that is being sent between the CPU and the GPU, as its sent compressed. In pre Zen 3 CPUs, this would be too slow, whereas Intel has supported these instructions for several years already.

 

[olstyle]

There is a link to

D3D12_TEXTURE_LAYOUT (d3d12.h) - Win32 apps

Specifies texture layout options. (D3D12_TEXTURE_LAYOUT)

docs.microsoft.com

In that thread without further explanation and accompanied with the same questions as mine. From what I understand it might improve things above 4GB, but having fast access to 4GB chunks would still be a huge increase to the standard 256MB.

 

[InVasMani]

If these are accurate results this is very promising! I wonder if it has anything to do with the loading of assets in wider open games that RDR2 is getting that massive boost. I can attest that no matter what I do in some games I cannot get away from those micro stutters whenever I am exploring the world and as new items load I there is a slight, but noticeable stutter. If this fixes that I will kiss some feet! This is one of the biggest things that keeps driving me crazy in games that I have not yet been Able to fix

Sounds like possibly a storage or memory bottleneck.

 

[Ferrum Master]

Sounds like possibly a storage or memory bottleneck.

I ran the game from an Optane 900P. It still stutters a lot. It is the Game engine design and it is kinda specific here. It ain't a bug or flaw, it is like that by default, the engine is sensitive to this feature. Not that we have truly a lot such engines capable of having so much and doing things all the time at the same place. We cannot compare it with Cryengine, UT4 or Frostbyte whatever... apples and oranges.

 

[InVasMani]

Latency, bandwidth, and capacity restraints can really all cause major performance slowdowns and what you describe sounds kind of like a classic case of it, but given you say with Optane there very well could and probably is something else cause performance issues. It's interesting that doesn't seem to make a pronounced difference and yet SAM has a enormous difference on the minimum frame rate. There has to be a logical explanation to that matter I would imagine. To be pair on the optane matter isn't NVME actually better in certain regards in terms of performance worse latency yet higher bandwidth!!? On another note with Optane did you try NTFS compression? You can net a bit more bandwidth like that. In a lot of cases what you describe is generally one of the issues I mentioned. Some games are inherently poorly coded though like EQ2 with the shadows being CPU rendered it's a design pisser for certain.

In the case of RDR2 might even be clip plane view distance matter I ponder too much loading quickly in instance at once at high details and not enough culling and detail reduction of the distance resources of textures and animations relative to the system hardware. There is a lot open world games that have problems trying to load way to much stuff at once in the distance that cause hitching and slowdowns if you don't tame those settings a bit. It's a good looking game and that kind of thing can kill performance quickly especially if VRAM or other system resources is a bit borderline.

What happens when you reduce memory frequency with the same latency to the FPS I ponder. If memory frequency impacts heavily the game defiantly is memory bandwidth limited to a degree. Still that doesn't explain how SAM is yielding such enormous FSP minimum gains to me that implies a bottle neck from storage or the PCIE interface itself. It could very well be the PCIE BAR size is the actual bottleneck in this instance. Really w/o increasing the BAR size there are still ways around the problem, but not necessarily as easy or simple at the same time.

 

[Rahnak]

Boosts performance to an almost difference class of product wow!

I'm kinda sad now that SAM might not come to Ryzen 3000 and older. From a comment on videocardz:


Wikipedia source

https://twitter.com/x/status/1331853611043856389

Ah, shucks. My slim hope of this making it to Zen2 has been crushed. I guess this shiny new feature may end up kind of backfiring on AMD somewhat, since Intel can apparently enable this on much older CPUs if they want to. Not that AMD didn't know that beforehand, so kudos to them with going with it anyway.

 

[Sybaris_Caesar]

Ah, shucks. My slim hope of this making it to Zen2 has been crushed. I guess this shiny new feature may end up kind of backfiring on AMD somewhat, since Intel can apparently enable this on much older CPUs if they want to. Not that AMD didn't know that beforehand, so kudos to them with going with it anyway.

You and me both, son. You and me both.

 

[olstyle]

Guess I wasn't so wrong about no possibility of Zen2 support being a stupid rumor after all

https://twitter.com/x/status/1337423558042120194

 

[InVasMani]

Ah, shucks. My slim hope of this making it to Zen2 has been crushed. I guess this shiny new feature may end up kind of backfiring on AMD somewhat, since Intel can apparently enable this on much older CPUs if they want to. Not that AMD didn't know that beforehand, so kudos to them with going with it anyway.

I mean be realistic it's Intel we are talking about here they'll probably enable it on the current lastest MB socket if you're lucky or use it as a excuse to rebrand them for a quite buck.