Which is better for a home lab running many virtual machines?

The ASRock EPC621D8A. Two Xeon Scalable CPUs and six-channel memory per socket give it far more cores and RAM bandwidth, which is what VM hosts need.

Can I build a quiet workstation with the ASRock board?

It is possible but harder. The board expects server heatsinks and strong case airflow, and it has no integrated graphics, so you need a GPU or BMC access.

Does the Supermicro X11SRA need a graphics card?

No. It has integrated graphics, so it can drive a display without a discrete GPU, which suits a basic workstation build.

Which board supports faster storage out of the box?

The Supermicro X11SRA. It has two M.2 PCIe 3.0 x4 slots with RAID 0/1 and two U.2 ports; the ASRock board lists SATA and M.2 but no U.2.

Is the Supermicro worth stepping up to over the ASRock?

Only if you want a single-CPU workstation with integrated graphics and M.2/U.2 storage. For maximum cores and memory, the ASRock dual-socket board is the stronger platform.

Which platform has the longer useful life?

Both are older server platforms. LGA3647 Xeon Scalable has a wider supply of CPUs and memory, while LGA2066 Xeon W is a smaller market, so parts hunting favors the ASRock.

ASRock EPC621D8A Motherboard vs Supermicro X11SRA

These are different platforms, not close rivals. The ASRock EPC621D8A is a dual-socket LGA3647 Xeon Scalable server board built for many cores and lots of memory; the Supermicro X11SRA is a single-socket LGA2066 board for Xeon W, aimed at workstations. Pick the ASRock for dense virtualization or rendering on a budget of cores and DIMMs; pick the Supermicro for a quiet, single-CPU workstation with integrated graphics and M.2. Owners of X11SRA boards praise Supermicro build quality and IPMI-free simplicity; LGA3647 boards are praised for core count but run hotter and need server cooling and a case with airflow.

Choose the ASRock EPC621D8A if you need two LGA3647 Xeon Scalable CPUs, 8 DIMMs of registered DDR4, and a server chassis with strong airflow.
Choose the Supermicro X11SRA if you want a single Xeon W workstation board with integrated graphics, two M.2 slots, and U.2 support.

Prices

ASRock EPC621D8A Motherboard: $559.93 at anafrashop.com (checked today)
Supermicro X11SRA: $502.11 at industrial automation parts (last seen Nov 9)
Difference: the Supermicro X11SRA is $57.82 cheaper than the ASRock EPC621D8A Motherboard at the latest prices (Nov 9 and Nov 10)

ASRock EPC621D8A Xeon C621 DDR4 SATA Motherboard

	ASRock EPC621D8A Motherboard	Supermicro X11SRA
CPU socket	Dual LGA3647, Xeon Scalable (Skylake-SP and Cascade Lake-SP)	Single LGA2066, Xeon W-2100 and W-2200
Chipset	Intel C621	Intel C422
Memory	8 DIMMs, DDR4 RDIMM/LRDIMM, six-channel per CPU	8 DIMMs, DDR4 RDIMM up to 256GB or LRDIMM up to 512GB, four-channel
Integrated graphics	None; needs a discrete GPU or BMC video	Yes, onboard video for setup and display
Storage interfaces	SATA ports plus M.2; no U.2 listed	Two M.2 PCIe 3.0 x4 (22110, RAID 0/1) and two U.2 PCIe 3.0 x4
Expansion slots	Multiple PCIe 3.0 slots across two CPUs	Three PCIe 3.0 x16 and one PCIe 3.0 x4, SLI support
Form factor and cooling	ATX server board; expects high-airflow chassis and server heatsinks	ATX workstation board; runs quieter with a single CPU
Typical use	Virtualization hosts, rendering nodes, dense storage servers	CAD, simulation, and content-creation workstations

Spec	ASRock EPC621D8A Motherboard	Supermicro X11SRA
Motherboard Socket Type	—	LGA2066 Socket
Motherboard Chipset	—	Intel C422
Motherboard Form Factor	—	ATX
Motherboard Model	—	X11SRA, X11SRA-RF
Form Factor	—	ATX
Manufacturer	—	Supermicro
Socket Type	—	LGA2066
CPU Compatibility	—	Intel Xeon Processor W Family, Intel Xeon Proce…
Motherboard Compatibility	—	ATX
RAM Type	—	DDR4
RAM Maximum Capacity	—	512GB (Registered ECC LRDIMM)
RAM Speed	—	2666MHz

Spec	ASRock EPC621D8A Motherboard	Supermicro X11SRA
RAM Number Of Slots	—	8 DIMM slots
RAM ECC Support	—	Yes
CPU Manufacturer	—	Intel
CPU Model	—	Xeon W-2200 Processors, Xeon W-2100 Processors
CPU Series	—	Xeon W
CPU For Use With	—	Server
Discrete Graphics	—	No
Integrated Graphics	—	Yes
GPU Type	—	Integrated
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ASRock EPC621D8A Motherboard vs Supermicro X11SRA

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ASRock EPC621D8A Motherboard vs Supermicro X11SRA

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ASRock EPC621D8A Motherboard

Supermicro X11SRA

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ASRock EPC621D8A Motherboard

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