NVMe Cache advice

[Enquiries]

Hey guys hope u are both doing well. I need a little advice regarding which drives to get for caching so this is the breakdown

NAS = TVS-872X (has 2x Firecuda 520's in the M.2 slots in RAID1 for apps)

QNAP QM2-2P10G1TA (Will be used as cache card)

My objective is to purchase 2x 500GB NVMe drives to be used in RAID1 for caching in the above mentioned QM2 card which only has 1000MB/s of bandwidth so I dont need to go crazy for the fastest drive.
Which drives would u recommend for caching purposes that wont break the bank given the 1000MB bottleneck but which should be just fine in terms of efficiency & durability?

[ed]

In the case of caching, speed might not be the most important factor. IOPS and Endurance is.

When choosing NVMe for caching you need to look at reliability ratings such as DWPD/MTBF. Here are a few on the list
https://nascompares.com/answer/nvme-m-2-...dwpd-mtbf/
Caching means a lot of read and write operations, unlike regular storage situation.
You would need to look at models with 0.5DWPD and above

970 pro – 0.66DWPD
Seagate FireCuda 510 – 0.7 DWPD
Seagate FireCuda 520 -0.9 DWPD
Seagate IronWolf 525 – 0.7 DWPD
Seagate Firecuda 530 – 0.7 DWPD
Synology SNV3400 – 0.68DWPD
WD Red SN700 – 1.0DWPD

I hope this helps.