What makes it cost so much compared to like a $150 DAC?
Part of it is quality of components, part of it is build quality and part of it is after sales service. The audio interface mentioned in my signature is a mere two channels, but sells for US$895. Why will people pay that? Because like everything Sound Devices makes, the preamps are great, it's reliable, it's built to last, and if you have a problem you can call Sound Devices and have a real human being on the line, and a knowledgeable one at that, in a couple of minutes. When you get to a certain level of gear, Apogee is similar.
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For me the key feature is silence. I havent had egpu before, because they all suffers the high noise unless you get an alternative method to cool the unit.
Blackmagic was the first one i considered to buy and and oh boy, it is quiet! and a real pleasure to use it under the heavy load too. I rather pay some extra than having a jet turbine on my desk.
Having had an RX 590 in an Asus enclosure for about two weeks now, let me give you my honest assessment of this.
I think that the claims that the Blackmagic/RX 580 is quieter are wildly overblown. Perhaps these claims make sense if the Blackmagic is compared to a GPU trapped in a standard computer case; and maybe, arguably, if it is compared to a GPU in an external housing that also contains the power supply, although I now think that the latter argument is pushing it.
The fact of the matter is that I've got an RX 590 GPU running in an Asus box and I hardly notice it. The fans aren't even running unless they are under load, and even then I have to listen for it.
The situation may be different for the Vega GPUs, especially the Vega 64, but I'm coming to the conclusion that if one is talking about one of the Polaris 500 cards, this is not the issue that one might think based on Blackmagic sales talk.
I'm not trying to trash the Blackmagic housing. It looks great, and I'm sure that it does a great job. I just think that the talk about noise is more than a little over the top.