QM2 Expansion Cards explained

QM2 Expansion Cards explained

I am not a pro IT person like yourself and followed your advice and purchased a TS-251D and have been very happy

I am looking to expand the NAS with some SSD cache and I am confused about the difference between QM2-2P-244A vs QM2-2P-344 cards except that the 344 is slightly more expensive.. 🙂

I just want to expand NAS with 1 or 2 SSD’s and not bothered about 10GBs RJ45 and confused about the difference between the 244 and 344

Appreciate your feedback if you get chance?


Here is a decoded version of a model number:


Q – Qnap

M2 – m.2

-2 – m.2 slots

P – nvme

-3 – gen 3

4 -x 4 lanes

4 – 4 internal x lanes

The speed difference between these two cards is as follows:
QM2-2P-244A -> 2GB/s
QM2-2P-344 -> 4GB/s

The speed of TS-251D PCIe is around 2000MB/s

So I would recommend QM2-2P-244A unless you would move this card to a future NAS. Then Gen3 would be useful.

I hope this helps.

If you like this service, please consider supporting us.
We use affiliate links on the blog allowing NAScompares information and advice service to be free of charge to you. Anything you purchase on the day you click on our links will generate a small commission which is used to run the website. Here is a link for Amazon and B&H. You can also get me a ☕ Ko-fi or old school Paypal. Thanks! To find out more about how to support this advice service check HERE   If you need to fix or configure a NAS, check Fiver   Have you thought about helping others with your knowledge? Find Instructions Here  


Or support us by using our affiliate links on Amazon UK and Amazon US

locked content ko-fi subscribe

DISCUSS with others your opinion about this subject.
ASK questions to NAS community
SHARE more details what you have found on this subject
CONTRIBUTE with your own article or review. Click HERE
IMPROVE this niche ecosystem, let us know what to change/fix on this site
EARN KO-FI Share your knowledge with others and get paid for it! Click HERE