heat sinks on PCIe cards for NVMe SSD

[Enquiries]

I noticed that QNAP TS-x53D PCIe cards for NVMe SSD include heat sinks and sticky thermal pads, but Synology DS920+ just has sockets for NVME SSD with only air flow for cooling. Is this because QNAP supports use cases for SSD that go beyond caching, and thus are presumably more heat intensive? Is the Synology design safe, and if not do you recommend any specific thermal mitigation to use there? Thank you