AMD's new generation of Radeon RX 6000 series graphics cards support Smart Access Memory smart addressing video memory technology, which allows CPU to access all graphics memory on the graphics card at one time，Greatly improves data transmission efficiency，Eliminate previous transmission bottlenecks to improve performance，After turning on, the performance of RX 6800 series graphics cards can be increased from 1% to 9%.。But at the first launch, AMD announced that only Ryzen 5000 series processors support this technology，But most players who currently use Zen 2 architecture processors also want to upgrade the RX 6000 series graphics card，They hope AMD will delegate SAM support to the old Ryzen processor，But at present, this is impossible，It is not supported because it is a hardware reason。
Some people probably believe that the Zen 2 architecture Ryzen 3000 series processor also supports PCI-E 4.0.，There should be no hardware problems，Actually, this has nothing to do with the PCI-E version，You can see that the Intel 400 series motherboard with only PCI-E 3.0 also supports SAM.。According to Techpowerup's report，The essence of AMD SAM technology is the Resizable Base-Address Register function developed by PCI-SIG，It allows the processor to regard all existing graphics cards as a single addressable area。
The problem is that only the PCI-E controller of the Ryzen 5000 series processor with Zen 3 architecture imports the PCI-E entity layer function of full-rate_pdep_u32/64，This is necessary to execute the Resizable Base-Address Register。
Interestingly, Intel has supported this feature since the Haswell architecture processor，That is to say, as long as the motherboard manufacturer is willing to provide BIOS support，Intel platforms since 2014 can enable SAM function of AMD RX 6000 series graphics cards，That is, Intel8 series motherboards and future motherboards support，Of course, because the motherboards in those eras were all EOL，Which motherboards will provide new BIOS support depends entirely on the motherboard factory's mood。
In addition, since this is a PCI-SIG function，So it's okay to use NVIDIA.，In fact, NVIDIA is also developing similar functions，It is planned to add support for this feature on some GPUs now。
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