to A)
yes its still common practice to deactivate every device in the BIOS which you do not require.
As the driver simply generate interrupts. Interrupts issue running low level routines, which can not be interrupted by the process scheduler. There is only a "programming convention" that a driver should exit working to give CPU resources free after a certain amount of time. If badly written driver run together on a CPU core, where also audio related processes run, then the likelyness increases, that the CPU is blocked for too long and audio data can not be processed in time, which leads to interrupterion. Thus ... disable all potential hardware on your mainboard which you do not require / intend to use.
Especially internal sound, wireless, blutoot (in the past: serial, parallel interfaces) ....
Internal sound you do not require anyway, because
1) you can use in a DAW only one ASIO driver at a time, so there is only the RME driver which can be used
(lets not talk about workaround solutions like ASIO4ALL for people working with USB microphones)
2) Its not required because you can enable WDM devices in the RME Driver settings dialog, so that Windows and applications can use inputs and outputs of your card (so to say for the windows sound system and applications)
to B)
RME card is not a "consumer soundcard" with the typical plugs to support the Audio connectors of a PC.
This is also not the quality of connectors you want to work with anyway and there is no support for symmetric connectors.
So better get an RME interface which satisfies all of your demands and disable internal sound, thats it.
If you need something cheap for gaming (i.e. for a PC headset) then I would recommend to get a
bluetooth headset and plug an Bluetooth USB adapter on demand.
I have a "Plantronics Voyager Focus UC B825-M" (-M stands for Microsoft version)
and use it with a "Belkin mini Bluetooth v4.0 Adapter".
Then you can install a very handy application called Audio Switcher
http://audioswit.ch/er?utm_source=clien … _1_7_0_117
Which easily enables your BluTooth headset as default device, if you turn it on.
And turns it off automatically when you power it off. By this you save the tedious work to change the Windows default communication device to default device when listening music, etc ...
EDIT: the Plantronics comes with a special Bluetooth Adapter of its own, but I use the other one as well, because I need one, which also works with other devices like smartphone to be able to synchronize i.e. contacts and appointments with Outlook using MyPhoneExplorer.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14