The drivers for the Asus are also several years old. But this Tempotec is basically a no nonsense audio card with no inputs. It has RCA outputs and a coax and optical optical outputs. That is why it appeals to me. I want something for music. I'm not a gamer or into movies so I don't need surround sound. though this can do 5.1 Dolby digital through the digital outputs.
I found out through another website that it uses a Burr Brown DAC and Op-amps are replaceable and a 6.3mm headphone jack that can drive 600ohm headphones.
It seems like an incredible deal for $99. I'm surprised there's no discussions or comparisons about it.
I did not see anything showing the Serenade comes with any Dolby software?
So you would need a separate software package, that comes with DDL (Dolby Digital live) or DTS's DTS-Connect, to send 5.1 out the cards S/PDIF (optical/coaxial) ports.
Hardware wise, it does look like a nice value, for $99.
The card comes with the C-Media CMI8888 (CMI8888DHT? or CMI8888DMS?) DSP chip, they are a native PCI-E interface chip
If you prefer
Is is possible the Serenade for audio quality, gives about as good audio quality the higher costing Essence STX II.......maybe?
For the price of the Serenade, you could get a used (the original) Essence STX card and use the software/drivers from Unified Xonar Drivers.
http://maxedtech.com/asus-xonar-unified-drivers/
I myself could make use of the coaxial output, As with my NFB-11.28, I could run optical from my Cable TV box, while I could then be running coaxial from my Win 10 PC.
The Senerade might be something I would consider buying, just because I would like to replace my current Xonar DX (PCI card), with something that has a native PIC-E chip interface.
The Senerade comes with 4 op-amps sockets, so I'm going to assume(?), it's two socket are dual channel V/I and two are single channel each, for the buffer.
(have no idea what the stock op-amps are)
So if you into swapping op-amps, the Serenade would have that as a positive.
It sounds like you really have no need for a sound card, when an external DAC/head amp might do the job.
Spend $100 for an external headphone amplifier (technically better the the Serenade's head amp) and $30-$70 for an external DAC.