For fucks sake guys, get it right.
First, the OP's assumption stems from problems associated with soundcards from the 90's, where things like EMI and RFI were issues in PC cases and because Audio Electronics in terms of DAC's were somewhat in their infancy and they hadn't learnt to properly engineer against these factors.
I remember even with things like midiman (m-audio to you noobs) and Turtlebeach cards were even affected by placement of PCI slots or how close they were to PSU's or video cards etc.
These days it's simply not a concern with internal cards.
Secondly the argument of external being slower is a mute point (excuse the pun); Bandwidth of USB 3 or TB (even FW800) is so fast that there's not a real work advantage to PCI based cards. The only thing that does count against external cards is the round trip transport time but this is often compensated for by drivers, and there's many USB or TB interfaces that achieve latencies comparable to internal cards.
To be honest, unless your a concert grade pianist where sub 5ms latency actually matters, anything lower than 10ms is enough and my Echo Audiofire4 was able to achieve this back in 2005 while being rock solid.
It really comes down to the drivers and these days, all the drivers, even on entry level kit is solid and super low latency.
Unless you need 40+ physical inputs at sub 5ms latency then any prosumer external interface will do. Otherwise buy an Ensemble and be done with it.
That Claro soundcard is really a smi pro hifi card. It will be fine for in the box and actually uses that same chips (at least for the primary I/O as some of the Echo interfaces did a few years ago. The rest of the outputs use chips that you would find in M-audio products and they're still fine. It's not bad value especailly for a 24/192 card but personally I like balanced outs.
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