SwiftGo14 sfg14-63-Why is my SSD only reaching 3500Mb/s, Is PCIe 4.0 x4 has a limitation?

James_P

Hello!

I would like to ask about SSD speeds in this model - I've bought SSD with speeds 7500Mb/s but mine reaches something around 3500Mb/s. I've checked info in Crystal Disk and it says pcie 4.0 x4 which explains those speeds. Is x4 in pcie Acer limit? What are Your speeds/settings?

[Edited the thread to add model name and issue detail to the title]

RenanVilela

https://community.acer.com/en/discussion/715796/why-is-my-ssd-only-reaching-3500mb-s-on-my-acer-swift-go-14-sfg14-63-is-pcie-4-0-x4-a-limitation

Hi, good morning.
What is the full model of the SSD you bought?

James_P

It is Fanxiang s790 2TB. I know it might sound exotic but there are reviews or screens showing it easily reaches twice the speed I get.

Besides my main ssd drive (whis is most likely hynix pc801) shows pcie x4 and is limited to 3500Mb/s seq as well.

Axxo

Ty to check the temperature of the SSD with crystal disk info. Also, you can try to do a power reset by unplugging the power cable and holding the power button for 10 secs.

James_P

Temperatures are fine - main drive around 35 degree Celcius and secondary 40-45. Hard reset doesn't not change anything.

Now I see that I made a mistake in my main post - pcie 4.0 x4 is fine. What I had in mind was, that my drives have speed limits like pcie 3.0 - around 3500 Mb/s

eGomes

Hi,

SSD read and write speeds (benchmark tests) can be affected by Active State Power Management (ASPM) policy.

Try "temporarily" disabling the Link State Power Management option in the PCIe power settings + set Power mode = Best performance in Power & battery settings:

https://www.technewstoday.com/link-state-power-management/

https://www.windowscentral.com/how-change-power-modes-performance-or-battery-windows-11

It is important to remember that it isn't recommended to keep this option disabled for a long time. Because the estimated duration in hours (autonomy) of your laptop battery may be affected (reduced).

billsey

AMD never released specs for their SSD speeds. Although they are PCIe 4.0 x4 it's possible they don't actually meet the performance standard expected on those with the mobile versions. Have you seen other Hawk Point laptops that are achieving the full bandwidth? Theoretical should be 8GB/s, actual should be 10-20% lower due to things like file system overhead…

James_P

I've tried disabling Link State Power Management and setting best performance. Speeds stays the same.

@billsey Good point, but I found a review of exact Acer model SFG14-63-19Q which has exact SSD drive (main one) and there are screens showing read speeds reaching 5000MB/s. Mine barely reach 3500 MB/s for this drive. The review is here:

https://root-nation.com/en/gadgets-en/laptops-en/en-acer-swift-go-14-2024-review/

eGomes

The AMD platform also has a feature called PCIE Speed Power Policy (PSPP), which adjusts the SSD transmission rate dynamically to save the system power consumption and provide a better battery life into laptops.

The problem that's this option is generally not available for the end user's to adjust in the UEFI firmware settings.

James_P

Never heard of such a feature. Every day learning something new :)

But anyway it is not the case here as it is shown in the review that in this model SSD runs quite fast. And much faster than mine. I doubt that mine has different pcie policies that the copy used in the review.

Is there something I'm missing? Maybe in Windows? I've made a clean install after purchase.

billsey

Make sure you are using the same software to test with as they did, and that you don't have other disk activity going on. If, for instance, the antivirus is doing a background scan while the scan is running you will see radically different results than when it's not doing the scan. Same thing goes for memory usage, if your usage is high enough the OS will be swapping to disk…