Are the latest ASIO drivers compatible with Win Server 2019 ?
v4.29 is happy on 1809 (2019)
Also on 1607 (2016)
There is the little issue with RDP+Totalmix - totalmix not taking into account windows servers being multi-user OS:
-each RDP session user can control totalmix without what they are doing being visisble to other users on the system.
-eg any changes they make to totalmix take effect globally but doesn't show on the other users totalmix window, as say it does with totalmix remote.
-don't use setting 'store settings for all users' in HSDP settings
-don't use roaming prolifes on any domain accounts you use to logon to the machines.
Do you see any difficulty to mount this card into a 1U chassis ?
You can only fit 1/2 the MADI cards.
Does the MADI work with only one board ?
imho you need a 2U chassis for that card.
PowerEdge R740 iirc has enough space for 3x full cards
HP are better for audio imho. As @Ramses mentions BIOS - normally HP bios gives you finer grain control over cpu functions etc. Ability to turn of speed/clock altering stuff etc.