Dell R720 internal SATA drives

drive enclosure in PCI slot

https://www.newegg.com/p/N82E16817998052

All on Newegg: https://www.newegg.com/p/pl?N=100007599%20600551599

What about Amazon?

SATA connectors inside the case

Says connectors 2 & 4

SATA connectors:

photo, see above left RAM: https://cdn.etb-tech.com/media/catalog/product/cache/68250b5260b930b2300bcc8422ca32a1/r/7/r720_r720xd_mb_h5j4j_v5_top_zoom.jpg

https://www.ixsystems.com/community/threads/how-to-install-internal-ssd-boot-drive-for-dell-r720.77745/

See p 129 on this manual https://topics-cdn.dell.com/pdf/poweredge-r720_owners-manual_en-us.pdf

K317N 4 Device SAS SATA Data Cable SFF-8484 to SFF-8482 Female Sata Power
Fits Dell PowerEdge T110 Systems. Replaces Part Numbers: K317N, 0K317N
https://www.amazon.com/SFF-8484-SFF-8482-PowerEdge-Systems-Replaces/dp/B07JV9T8VW/

https://www.disctech.com/Dell-SAS-Cable-Mini-SAS-to-Mini-SAS-2ft-R520

SLOG - 1

Intel® SSD DC S3700 Series

https://ark.intel.com/content/www/us/en/ark/products/71915/intel-ssd-dc-s3700-series-400gb-2-5in-sata-6gb-s-25nm-mlc.html

https://www.amazon.com/Intel-Optane-800P-58GB-XPoint/dp/B078ZJSD6F

max 600MB/S

https://www.amazon.com/HP-691842-004-2-5-inch-Internal-SSDSC2BA800G3P/dp/B07SXV6YJF

Samsung with PLP
https://www.amazon.com/Samsung-883-DCT-MZ-7LH480NE-Warranty/dp/B07HCDZR2N/

SLOG - 2

Intel Optane SSD 900P Series (280GB, AIC PCIe x4, 3D XPoint)

https://www.amazon.com/Intel-Optane-900P-280GB-XPoint/dp/B0772XB3MY/

use:

https://www.ixsystems.com/community/threads/right-optane-configuration-to-get-superb-iops-for-zil.73917/
https://www.servethehome.com/buyers-guides/top-hardware-components-freenas-nas-servers/top-picks-freenas-zil-slog-drives/

SSDs for the OS?

Not sure yet, probably just a pair of samsung EVO 970