No way this isn't 88 GB/s.
You win the prize, it's 88 GB/s xD
Apparently they just clarified it. Take away maybe 20 GB/s for the CPU and that's about 42.5 GB/s per TF for the GPU.
For reference, for PS5 it'd be about 41.65 GB/s per TF (assuming the CPU is 20 GB/s; it's likely more considering it's higher-clocked and has more cores & threads), and for Series X it's about 46 GB/s per TF, possibly closer to 44.55 GB/s per TF with similar 20 GB/s for CPU usage factored out (though like PS5, the CPU will probably consume more than 20 GB/s since it is clocked higher and has more cores & threads).
That's very good overall for the SteamDeck, even if actual bandwidth might dip closer to (spitballing here) 36 GB/s per TF (if the CPU is going to need more than 20 GB/s, tho in SteamDecks' case I can't see that happening as it's only 4-core/8-thread and likely lower-clocked than PS5's CPU by a decent amount).
EDIT: Since the CPU is rated at 448 GFLOPs at max clock (3.5 GHz, higher than I was expecting), it should only pull around 24 GB/s - 25 GB/s under max load.
Valve updated the information on Steam Deck website.
It's 88GB/s
I'm guessing he's doing the Steam Deck #s given its range of 1 TF - 1.6 TF but looks like CPU usage isn't factored into this, so they're theoretical bandwidth peaks. Goes for all the systems listed there.
Well,
technically they are very near
real bandwidth usage cases but only when CPU is idle, for gaming the CPU is usually doing at least some type of transfer on the bus any portion of a given second, but the numbers are still right. I just took lower ends which thinking for a second might be too low because they assume CPU's maximum bandwidth which would mean GPU isn't accessing system memory, which is also not likely to be the case
Although Steamdeck is unmatched as a portable. There will be limitations folks and keep in mind this is just the first iteration. Since they are not mandating developers code for the specs of the first Steam Deck, Valve is free to release updated hardware at any time.
I fully expect a Series S caliber portable in a couple years (from Valve or MS). That's when I will likely join the party.
The whole point of DirectStorage is that it doesn't need coprocessors. The GPUs themselves do the decompression. I see no reason why SteamDeck shouldn't be able to take advantage if it's the SSD version.
TBF, the GPU in Steam Deck isn't necessarily a beast; it's 8 CUs and if they have to use, say, 4 CUs for decompression, that can bring a hit to graphical performance. DirectStorage does not
need dedicated decompression hardware, but it would only help.
Also TBF, has it been confirmed there is no decompression block in this APU? We know it's custom between Valve and AMD, I'd like to think some type of decompressor has been built into it knowing what a hit the GPU would take it if it needed to do that.