AMD recently introduced its Phoenix APUs which will be launching as the Ryzen 7040 series on laptops but it looks like the company is also working on a second revision known as Phoenix 2.
AMD's Phoenix 2 APUs Reportedly In The Works With Cut-Down RDNA 3 GPU
There have been reports of a second AMD Phoenix 2 APU for a while now but the latest occurrence of the chip has been discovered within Coreboot patches which lists down both Phoenix (1) and the Phoenix (2) APUs. As discovered by Coelacanth-Dream, the AMD Phoenix 2 APU is not the same as the standard Phoenix APUs and has certain changes which make it an entirely new SKU. It remains to be seen if Phoenix 2 will actually see a launch.
Moving on with the details, the AMD Phoenix APUs are listed with two GFX1103 "RDNA 3" IDs. The first of these IDs is the GFX1103_R1 which is the standard one with 512 KB of L2 cache. The second one, GFX1103_R2, features half the L2 cache at 256 KB.
According to Felix Held's comment, is
0x00a70f80 (Family: 0x19, Model: 0xA8, Stepping: 0)Phoenix2 and Phoenix APU is . When I mentioned that Phoenix APU support is being promoted in Coreboot last time, I thought that it changed depending on the engineer sampling product and revision, but at least the Phoenix APU and Phoenix2 APU are clearly different regardless of that, but they are assigned. seems to beCPUID Family/Model/Stepping0x00a70f80 (Family: 0x19, Model: 0xA0, Stepping: 0)
CPUID ModelCPUID ModelAs for the difference between GFX1103_R1 and GFX1103_R2 , the size per L2 cache block has been revealed, GFX1103_R1 is 512KiB which is the same as Rembrandt (Yellow Carp) , while GFX1103_R2 is 256KiB. The code specifying GFX1103_R2 is not added
here, but the sentence case is 256KiB.
A slightly cut-down design makes it seem like that this Phoenix 2 APU might be the successor to the Mendocino APUs and could be targetted at low-power mobility platforms, with the next-gen Steam Deck handheld console, being one of the many possible implementations of this chip. This has also been highlighted previously by Moore's Law is Dead.
PHX2 cuts L2 cache size in half (as expected due to reduction in CU count). STX1 is same as PHX1 AFAIK, including the smaller VGPR. https://t.co/GXc6yIMlAo
— Kepler (@Kepler_L2) January 28, 2023
As per Kepler_L2 who has been keeping track of the Phoenix 2 APUs for a while now, the new chips will also feature a lower compute unit count which makes them sound like a conservative version of the Phoenix APUs. It will definitely be interesting to see the efficiency numbers that the Phoenix 2 APUs produce. The first AMD Phoenix APUs will make their debut on laptops in March 2023 so we can expect an update later in 2023 on the Phoenix 2 parts.
