It’s shared memory, so you would need to guarantee access to 16gb on both ends.

So… standard Desktop CPUs can only talk to DDR.

‘CPUs’ can only utilize GDDR when they are actually a part of an APU.

Standard desktop GPUs can only talk to GDDR, which is part of their whole seperate board.

GPU and CPU can talk to each other, via the mainboard.

Standard desktop PC architecture does not have a way for the CPU to directly utilize the GDDR RAM on the standalone GPU.

In many laptops and phones, a different architecture is used, which uses LPDDR RAM, and all the LPDDR RAM is used by the APU, the APU being a CPU+GPU combo in a single chip.

Some laptops use DDR RAM, but… in those laptops, the DDR RAM is only used by the CPU, and those laptops have a seperate GPU chip, which has its own built in GDDR RAM… the CPU and GPU cannot and do not share these distinct kinds of RAM.

(Laptop DDR RAM is also usually a different pin count and form factor than desktop PC DDR RAM, you usually can’t swap RAM sticks between them.)

The PS5Pro appears to have yet another unique architecture:

Functionally, the 2GB of DDR RAM can only be accessed by the CPU parts of the APU, which act as a kind of reserve, a minimum baseline of CPU-only RAM set aside for certain CPU specific tasks.

The PS5Pro’s 16 GB of GDDR RAM is sharable and usable by both the CPU and GPU components of the APU.

…

So… saying that you want to have a standard desktop PC build… that shares all of its GDDR and DDR RAM… this is impossible, and nonsensical.

Standard desktop PC motherboards, compatible GPUs and CPUs… they do not allow for shareable RAM, instead going with a design paradigm of the GPU has its own onboard GDDR RAM that only it can use, and DDR RAM that only the CPU can use.

You would basically have to tear a high end/more modern laptop board with an APU soldered into it… and then install that into a ‘desktop pc’ case… to have a ‘desktop pc’ that shares memory between its CPU and GPU components… which both would be encapsulated in a single APU chip.

Roughly this concept being done is generally called a MiniPC, and is a fairly niche thing, and is not the kind of thing an average prosumer can assemble themselves like a normal desktop PC.

All you can really do is swap out the RAM (if it isnt soldered) and the SSD… maybe I guess transplant it and the power supply into another case?

I don’t know how you could arrive at such a conclusion, considering that the base PS5 has been measured to be comparable to the 6700.

I can arrive at that conclusion because I can compare actual bench mark scores from a nearest TFLOP equivalent, more publically documented, architecturally similar AMD APU… the 7600M. I specifically mentioned this in my post.

This guy in the article here … well he notes that the 6700 is a bit more powerful than the PS5Pro’s GPU component.

The 6600 is one step down in terms of mainline desktop PC hardware, and arguably the PS5Pro’s performance is… a bit better than a 6600, a bit worse than a 6700, but at that level, all of the other differences in the PS5Pro’s architecture give basically a margin of error when trying to precisely dial in whether a 6700 or 6600 is a closer match.

You can’t do apples to apples spec sheet comparisons… because, as I have now exhaustively explained:

Standard desktop PCs do not share RAM between the GPU and CPU. They also do not share memory imterface busses and bandwidth lanes… in standard PCs, these are distinct and seperate, because they use different architectures.

I got my results by starting with the (correct*) TFLOPs output from a PS5Pro, finding a nearest equivalent APU with PassMark benchmark scores, reported by hundreds or thousands or tens of thousands of users, then compared those PassMark APU scores to PassMark conventional GPU scores, and ended up with ‘fairly close’ to an RX 6600.

• The early, erroneous reporting of the TFLOPs score as roughly 33, when it was actually closer to 16 or 17… that stemmed from reporting a 16 digit FLOP score/test, when the more standard convention is to list the 32 digit FLOP score/test.

…

You, on the other hand, just linked to a Tom’s Hardware review of currently in production desktop PC GPUs… which did not make any mention of the PS5Pro… and them you also acted as if a 6600 was half as powerful as a PS5Pro’s GPU component… which is wildly off.

A 6700 is nowhere near 2x as powerful as a 6600.

2x as poweful as an AMD RX 6600… would be roughly an AMD RX 7900 XTX, the literal top end card of AMDs previous GPU generation… that is currently selling for something like $1250 +/- $200, depending on which retailer you look at, and their current stock levels, and which variant of which partner mfg you’re going for.