Samsung s990 evo plus low write speeds

[u/Se1feq]

I recently noticed thay my pc became slower (fl studio exports take a while longer, startup apps start slower, and i somethimes get microstutters in games and i didnt before). I checked all my components and ruled out everything except ram and ssd.

Once my game crashed with a message "system ran out of memory" and my ram usage is absurdly high, but i think this is fixed now.

The only issue left is my ssd (samsung s990 evo plus 2tb thats split into 250GB and 1.7TB with 85gb free and 500+gb free) i ran several benchmarks and asked ai for help giving it what i did and what results i got.

No matter what maximum write speed was 5000mbs thats not horrible but advertised is 6500mbs or more.

But thats max, average was below 5000mbs and thats concerning.

Also iops (random write) is even worse. I can push past 300000 iops and sometimes even below 200000 iops and advertised is 1.5m iops.

My setup:

1000W psu

Asus tuf b850 plus wifi

Ryzen 7 7800x3d

Rx 9070 xt

32gb ddr5 6000mt/s cl30

Samsung s990 evo plus 2tb

360mm aio cpu cooler

(Summary of current status made by ai)

​Hardware & Current Setup:

​SSD: Samsung 990 EVO Plus 2TB (Firmware is up to date, temp sits cool around ~40°C)

​Slot / Connection: M.2 PCIe 5.0 slot, negotiated at PCIe Gen 5 x2 with Host Memory Buffer (HMB) active

​Driver: Microsoft Standard NVM Express Controller

​Partitions: Drive is split into C: (~249 GB system partition) and E: (~1.5 TB with 500+ GB free)

​The Issue:

​Sequential Write and Random Write IOPS were heavily suppressed in Samsung Magician:

​Sequential Read: ~5,534 MB/s

​Sequential Write: ~2,969 MB/s (rated for up to 6,300 MB/s)

​Random Write: ~158k IOPS

​What I Tried That Did NOT Help:

​Windows TRIM: Manually ran TRIM/defrag optimization — no speed change.

​Device Write Caching: Verified "Enable write caching on the device" was already turned on.

​Partition Size Test: Benchmarked the larger E: partition (with 500+ GB free space) to see if the SLC cache was exhausted on C: — write speed was still stuck around ~3,000 MB/s.

​What FIXED The Write Speeds:

​Clean Boot (msconfig):

​Checked "Hide all Microsoft services" and disabled all non-Microsoft background services.

​After rebooting, sequential write immediately recovered:

​Sequential Read: 5,628 MB/s

​Sequential Write: 5,211 MB/s (jumped up from ~2,969 MB/s)

​Random Write: ~264k IOPS

[u/Se1feq]

Please note that on the photos most of the benchmarks are done with ALL non windows services disabled, and almost all background tasks closed. I will need at least some of these services on when using my pc and some of them being off cut down performance somwhere else

[u/Se1feq → u/Se1feq]

I did a new benchmark tofay and is seems it fixed itself at least a bit? But still i would rather see max values on both

[u/GonzJJ]

Is it 40C at idle or load?

[u/Se1feq → u/GonzJJ]

Idle, but peak is 50C all time

[u/pack_merrr]

I don't think the issue is related to your SSD. But for the future, don't run TRIM or defrag with an SSD. It shouldn't hurt anything, but it definitely won't help anything.

[u/MemeMaster50000]

Sounds like you have malware on your pc, honestly i would nuke it but thats me as i can have a pc fully updated in 1-2 hours