Not link-limited
PCIe 5.0 ×4 carries about 15.75 GB/s. At 10,000 MB/s read this drive uses roughly 63% of it. Unlike the Gen4 drives, it is limited by its NAND and controller, not the bus — which is why Gen5 headline numbers keep climbing while the connector stays the same.
The heatsink is structural
Gen5 controllers dissipate roughly 8 to 11 W under sustained load. Bare, they throttle within seconds. The machined aluminium heatsink is a functional requirement, and the direct consequence is that this drive does not fit the PS5 M.2 bay, does not fit any laptop, and will foul a GPU that sits over the primary M.2 slot on some boards.
DRAM cache, and what it buys
A dedicated DRAM buffer holds the flash translation layer mapping table on the drive. A DRAM-less controller borrows host memory over HMB — typically 64 MB — which is adequate for light desktop use and degrades on sustained random writes and on a nearly full drive, where map pages have to be fetched across PCIe. This is supplier-stated; the controller part number is not published by the supplier.
Gen4 slot, Gen4 drive
It links down cleanly to Gen4 and Gen3, and then it performs exactly like a Gen4 or Gen3 drive while costing Gen5 money. Confirm the slot is PCIe 5.0 and CPU-attached — a chipset-attached slot shares uplink bandwidth with everything else on the chipset.
Where 10,000 MB/s shows up
Large sequential file movement: video ingest, disk images, dataset staging. It does not show up in game load times, which are bound by low-queue-depth 4K random reads. If your reason for buying is faster game loads, the Gen4 drive at a third of the price is the honest recommendation.
Sustained writes still hit TLC
9,500 MB/s is into SLC-mode cache. Past the cache the drive writes at native TLC program speed regardless of link generation. The DRAM buffer accelerates mapping lookups, not flash programming.
