Does the UD90 need a heatsink, or is it fine without one?
For normal desktop or laptop use, it's fine without one. Because the UD90 targets mid-range
rather than flagship bandwidth, it runs cooler than many higher-end Gen4 drives by design.
A heatsink or reasonable case/laptop airflow still helps during long, sustained transfer
sessions, and is worth adding if your case runs warm or airflow is limited.
How do I know if my motherboard actually supports PCIe Gen4 speeds?
Check your motherboard's spec sheet or manual for the specific M.2 slot you're using —
it should be listed as PCIe Gen4 x4. Gen4 support also depends on your CPU and
chipset, not just the slot itself, so both need to support it. After installing, you can
confirm the negotiated link speed with a tool like CrystalDiskInfo or HWiNFO, which will
show whether the drive is actually running at Gen4 or has fallen back to Gen3.
Will a PCIe 4.0 SSD still work in an older PCIe 3.0 motherboard?
Yes. NVMe drives are backward compatible, so the UD90 will work fine in a PCIe 3.0 M.2 slot
— it will simply run at Gen3 speeds (roughly up to 3,500MB/s) since that's the ceiling
set by the slot, not a fault of the drive. You'll still see a real upgrade over a SATA SSD
or hard drive; you just won't get the full Gen4 bandwidth until you're on a Gen4-capable
system.
Can I use the UD90 to expand PS5 storage, and does it need a heatsink there?
We wouldn't recommend the UD90 for this. Sony's official requirement for PS5 storage
expansion is a sequential read speed of 5,500MB/s or faster, plus a mandatory heatsink
due to the expansion slot's limited airflow. The UD90 is rated up to 5,000MB/s read,
which falls short of Sony's stated minimum, so it isn't a good fit here even though it
physically fits the PS5's M.2 slot. For PS5 expansion, we'd point you to the
Silicon Power US75
instead — rated up to 7,000MB/s read, comfortably clearing Sony's minimum, and
independently tested to perform well on PS5.
Is a DRAM-less SSD (HMB) actually worth buying, or should I pay more for one with DRAM?
For most people, yes, it's a reasonable trade-off. HMB-based drives like the UD90 borrow a
small amount of system RAM instead of including a dedicated DRAM chip, which keeps cost
down while still handling gaming, everyday use, and typical creative work well. DRAM-equipped
drives tend to hold an edge in sustained random performance under heavy multitasking or
professional workloads — if that's specifically what you need, paying more for a
DRAM-equipped drive is worth considering. For everyday and mainstream use, the difference is
rarely the deciding factor.
My SSD isn't showing up after installation — what should I check first?
Start with the basics: make sure the drive is fully seated and the retention screw is
secure. Then check whether your M.2 slot shares PCIe lanes with another port that might be
disabling it (common on some motherboards when certain SATA ports or slots are in use) —
your manual will list this. Also confirm your BIOS is updated to the latest version and that
the M.2 slot is enabled. If you're installing as a boot drive, make sure BIOS is set to UEFI
mode with NVMe support enabled.
Is this SSD fast enough to run local AI models like Llama or Stable Diffusion?
For occasional, hobbyist use with quantized models through tools like Ollama or Stable
Diffusion, yes — the UD90's Gen4 bandwidth loads model checkpoints noticeably faster than
a SATA SSD. As a DRAM-less design, though, it isn't built for continuous, heavy sustained-write
workloads like large-scale dataset ingestion or model training; for that kind of sustained
duty cycle, a workstation- or enterprise-class drive is the better fit.
