The Fiio E10 can not work with add-on sound cards features, or even motherboard built in audio features.
But the E10 will work fine plugged into the USB, if all you care about is is 2-channel stereo audio.
Fiio E11, can drive 250-ohm headphones with volume knob at 50%, but you should get an extra battery and simple battery recharger to go with it.
Used Fiio E9 solid state head amp. (no battery to recharge).
A single tube headphone amplifier, prices start at $50 and they sell on Amazon.
On eBay there is a much larger choice in brand and tube type, prices $50 to $120