I guess this was simply to make it official, I have SAM enabled on my R9 3900X + X570 mobo for quite a while now....

If you can find 6800\XT at stock...

since this feature is pci express based, and is between the cpu and the gpu, that are directly connected outside the chipset. I want to know what the hell you need the serie 500 for. I m sure this feature can be activated on zen1 with geforce 1000 series too. But probably no one wants to help there.

its been demonstrated to function on zen 1 and 1+

asturur:

since this feature is pci express based, and is between the cpu and the gpu, that are directly connected outside the chipset. I want to know what the hell you need the serie 500 for. I m sure this feature can be activated on zen1 with geforce 1000 series too. But probably no one wants to help there.

I'm sure it can work there, it's just that no one wants to provide support for it and solve possible issues. It's not an unreasonable thing, to be honest.

I understand Zen and Zen+ are completely different from Zen2/3. But what does the 500 series chipset have so different from 400 series ones? I don't buy the PCIe4.0 BS, there's plenty of speed on a 16x PCIe 3.0 to make it happen.

Silva:

I understand Zen and Zen+ are completely different from Zen2/3. But what does the 500 series chipset have so different from 400 series ones? I don't buy the PCIe4.0 BS, there's plenty of speed on a 16x PCIe 3.0 to make it happen.

Chipset has nothing to do with this. You can take PCIe 4.0 CPU, MB, GPU and use this feature while connection operates in PCIe 1.0 mode. It is not bandwidth limited functionality, it is feature limited functionality. Which means MB is just man in the middle through which electrical signaling goes. MB is not part of negotiation between CPU and GPU. For this purpose MB can be considered as passive element. Argument that someone may use GPU connected via chipset and that it could affect things is nothing else than: "Composition Fallacy. And at same time it is not technologically validated claim." And in before I have to have argument with someone who wants it for sake of having argument. I would advise them to consider: -> SAM is not ON/OFF function while OS is running. It requires reboot. -=> Check in which PCIe mode your GPU operates via GPUz. And how it changes over course of time from start till shutdown of OS. And how it is actually depending on load.

Weird. I just saw "- Optimized Resizable BAR (Re-Size BAR) function with NVidia Graphics cards." in bios description lines for B450 Tomahawk max. Tempts me to take out my 6800xt and go to buddy with this MB and 3700x to see difference, if any. (it is working for my z390 gaming edge BTW, at least in RDR2) AAND definitely it works great in Forza Horizon 4^^ tested yesterday

asturur:

since this feature is pci express based, and is between the cpu and the gpu, that are directly connected outside the chipset. I want to know what the hell you need the serie 500 for. I m sure this feature can be activated on zen1 with geforce 1000 series too. But probably no one wants to help there.

this is an OPTIONAL pcie spec feature - some controllers/card may not support it...

Silva:

I understand Zen and Zen+ are completely different from Zen2/3. But what does the 500 series chipset have so different from 400 series ones? I don't buy the PCIe4.0 BS, there's plenty of speed on a 16x PCIe 3.0 to make it happen.

Most b450 boards have had bios updates to enable resize bar. I know Gigabytes entire line did.