It's good to see more people realizing the IO limitations of such boards. The Asus ProArt Creator series are after all intended for "content creators", something I would argue it fails miserably at, not that it's directly Asus' fault, as it's mostly the fault of the platform. But it can certainly lead buyers down a path where they think their premium board will suit their needs, only to realize the limitations a few years down the road, making the platform obsolete long before the CPU.
A bit of drama there, a storm in a cup of tea... Owners can use this board for at least 5-7 years, which is plenty, without
any serious issues. And then move onto AM6 or other platform if they wish to. Nothing is going to be obsolete "a few years down the road". Pure nonsense claim.
With 4 lanes tied up with USB4, you'll basically be left with one fast M.2 and one GPU tied to the CPU, and another x4 gen 4 lanes to the chipset to feed everything else, including 2x M.2s, 4x SATA, NICs, etc. Considering the target customer group for this board probably would want one SSD for the OS, one for work and possibly one for gaming just to start out with, anything but the first will be running at reduced speed.
"Reduced speed" is Gen4 in worst case scenario, which is hardly any impediment on modern platforms. This board has enough PCIe flexibility to satisfy almost anyone's needs on a desktop platform. Primary Gen5 x16 slot can run at x8/x4/x4, so:
1. GPU 1 Gen5 x8 - perfectly enough for a few generations of GPUs; this very website measured that 4090 loses 1-2% of performance in Gen4 x8 mode
2. GPU 2 Gen5 x8, or x4 if M.2_2 is in use
3. M.2_1 - Gen5 x4 - attached to CPU
4. M.2_2 - Gen5 x4 - attached to CPU - bifurcated, when in use
5. M.2_3 - Gen4 x4 - attached to chipset
6. M.2_4 - Gen4 x4 - attached to chipset
But at the very least they could have offered 8x SATA ports, which is what the chipset features. Content creators without a server/NAS will probably be using large drives in RAID 1 or 1+0, and expand by adding another set, so those SATA ports will run out quickly.
No reason for peddling more SATA ports in 2025. Four is enough. One can attach four large capacity drives and call it a day. Besides, SATA AIC can be installed if anyone needs more. Content creators should have external storage too, for back-ups, in additon to any RAID in the system. If they don't have external storage, they can buy large capacity drives. Simple. No reason to create artificial issues that can be solved easily.
The best selling point for the board is probably the 10G NIC, a cost which could be offset by buying a different board and adding this later. But there have been a lot of gimmicky overpriced boards lately.
New batches of this board are already ~$120 more expensive, at $599 with Newegg. Once new tariffs kick in, there is no going back to $479. I'd recommend anyone considering this board to buy it now, until the first batch is not sold out. Some Microcenters still have it, but increasingly it's sold out at Microcenters across different states too.
The diagram shows that Gen5 x16 slots can be bifurcated into x8/x4/x4 and none of Gen4 slots are shared. It's one of best implementations of what AM5 platform provides, utilized to its full extent. One can always nitpick this and that, but ultimately there is nothing significatly wrong with this platform. Literally nothing.