Type of SSD for Aspire 5, A515-56

@RahulJoshi

I am glad that I helped you and you accepted my comment as the Accepted Answer.

The WD SN 550 drive from your link is just that type I mentioned  has 2,400 MB/s read speed. The PCIe 3.0 motherboard can support performance close to 3,400 MB/s, why settle for something that much slower and just a little bit savings. That was the reason I chose WD SN750 Black over this WD SN550 model. Currently, I use the Silicon Power A80 drive as boot drive in my other Acer desktop, and this desktop I consider it as a primary PC that I use everyday. 

I believe write speed is not as important as read speed. Everyday once the PC power on, it starts reading from the SSD, while people write a particular file or copy files less frequently. Even so, you can hardly tell the time difference if the file isn't too big (in the multi-GB range). All of the drives that I mentioned in the previous comment have seq. write speed of 1,600+ MB/s, which is already pretty fast. I do not know about other people, but for my real life usages ( surfing internet, video streaming, Acer Community comments, E-mails, pay bills etc...) just do not have much chances demanding high speed writing. The only times I needed high speed writing was when I compiled videos and copied 40GB data in one chunk from drive to drive. Anyway, those two cases were for testing purpose only, not that I really needed. For those people who do frequent, large file copying then writing speed is more important, but not for me.

I'll suggest using M.2 NVMe SSD for OS and then format the 1TB HDD for data only later. You will see it is a real BIG performance boost using the M.2 NVMe SSD. Using 1TB SSD for both OS and data will have best performance, but the cost will be higher. Since the 1TB HDD is already there, just use it.

Let me tell you my recent experience:

Last month I just bought an Aspire 5 A515-46-R14K. This laptop is very good, and it came with a Kingston 128GB NVMe SSD. This is a PCIe 3.0 x4 NVMe SSD having seq. read close to 3,300 MB/s (for NVMe SSD less than 1 TB, do not expect full speed like the 1 TB model, as less cache being used, there is always some discount in performance). The sequential write of this Kingston drive is just ~600 MB/s, that is terrible, just little faster than 2.5" SATA3 type of SSD.
However, in real life usage, this laptop just boots and shutdowns just as fast as my best desktop (11th gen Intel CPU i5-11500, PCIe 4.0 motherboard and PCIe 4.0 x4 M.2 NVMe SSD with seq. read close to 7,000 MB/s), because not much writing to do everyday. Before I bought the laptop, I had full intention to upgrade it to a 500GB gen 3 Silicon Power M.2 SSD, but now, I am satisfied with it and only will upgrade if the drive close to fill up ( don't know when it will happen, I'll most likely use an external HDD to save the data if storage space running low).

Since you have 11th gen CPU with your laptop, I think "IF" the laptop uses PCIe 4.0 motherboard, you probably can use gen 4 SSD too.

Yes, that is the type of heat sink that I recommended. In my 40GB data copying test, I was using the SSD without heatsink. In the first 10 GB the write speed was ~1,200 MB/s ( I was using the stock WD SN 520 x2 M.2 SSD), and all of a sudden the speed dropped to ~110 MB/s. That is called Thermal Throttling. When the SSD approaching overheating temperature the protective mechanism kicked in to slow down the writing process to protect the SSD from damage. That is the reason I suggested you to get a heat sink. Due to the cluttered space in a laptop, people cannot use full size heat sink. One weak point for this kind of heat sink is that the silicone bands may not be durable. Some people use polyimide tape instead of the silicone bands.
I just ordered heat sink and polyimide tape for my Kingston M.2 SSD and another 4GB RAM to ensure dual channel RAM performance today.

Good Computing!