Here's some solid real-use-relevant testing from W1zzard
Game Load Times:
Samsung 990 Pro is the company's flagship M.2 NVMe SSD. Compared to the 980 Pro, it comes with an improved controller and more modern flash. Our review confirms: this is the fastest PCI-Express 4.0 drive you can buy right now, beating the competition from WD, Phison and Solidigm.
www.techpowerup.com
Windows Startup Times:
Samsung 990 Pro is the company's flagship M.2 NVMe SSD. Compared to the 980 Pro, it comes with an improved controller and more modern flash. Our review confirms: this is the fastest PCI-Express 4.0 drive you can buy right now, beating the competition from WD, Phison and Solidigm.
www.techpowerup.com
If you have specific needs, it may well be worth it. If it's just for 'general' and 'gaming' use, you probably won't actually notice a bit of difference.
For day-to-day use, and 'seat of your pants'
feel, faster Rnd4Ks will be the biggest impact.
So, If you
really want to
feel a difference in an NVME upgrade, go Optane.
These CDM benchmarks of the P1600X were made on a clean Win 11 Pro 23H2 install for the first run. Then as a second step, to sort of parallel the conditions in which W1zzard tests these, I filled the drive furthermore to about 80% capacity to rerun all tests – twice. It’s not like I went into...
www.techpowerup.com
Beyond that, purchase by application/need. If no
specific usecase, then buy 'best bang for buck'.
Many NVME drives w/ DRAM cache are nearly indistinguishable in 'seat of pants' and day-to-day 'normal use' performance.
Which, is why I have
a
P1600X 118GB on the CPU M.2,
a
Sabrent Rocket 4.0 1TB on the X570 M.2
and
4x
Solidgm P41+ 2TBs in a QNAP
QM2-4P-384A ASMedia PCIe Gen3 switch-equipped NVMe expander in my X570's x4 slot.
I've had the Rocket 4.0 and P41+ as boot drives, before. The Optane is faster for that use.
Sure, the Rocket 4.0 'benches'
the fastest of the lot but, only in raw short-term throughput.
Cache Exhaustion being more noticeable/coming up sooner on the DRAMless QLC P41+ v. the DRAM'd TLC Rocket 4.0.
PS:
(At least on desktop) M.2 drives need not be constrained to the M.2 slot.
Passive adapters (M.2 to PCIe x1 and x4 slots) are very affordable and common.
View attachment 345403View attachment 345404
Conversely, U.2 and other 'server' standard NVME formfactor-interfaces are readily adapted to M.2 and PCIe x4.
View attachment 345401View attachment 345402
So, if it were in budget (<$400)... a 1.5TB Optane 905P for boot drive, could still connect into your CPU-connected M.2 slot.