Presonus Quantum Thunderbolt audio interface

For anyone curious, the Quantum is performing extremely well (especially when it comes to round-trip latency).
With light projects, you can take the ASIO buffer size down to 16-samples... and playback is completely glitch-free.
That's sub 2ms total round-trip latency (exact figure depends on sample-rate).
 
When connected to Asus Thunderbolt-3 controllers, the Apple Thunderbolt-3>Thunderbolt-2 adapter works just fine.
Presonus recommends the Startech adapter... but the Apple adapter works just fine in this configuration.
The Apple adapter is ~$50.
 
The Quantum is a great performer, simple to use, and isn't overly expensive for the feature-set ($900).
IMO, This is by far the best audio interface Presonus has released.

Starise
Thanks Jim. So unless I misunderstand which is highly probable, I can purchase an ASUS equipped MOBO and the Apple connector, the Presonus Quantum and all should work well?

 
Yes, the combination works well.  
 

Starise
Are you getting this latency using the Z feature in SO? Or is this achievable in CbB as well?

This is monitoring via software... so you can achieve the same result in CbB (or any DAW application).
Actually... RTL at the 16-sample ASIO buffer size was closer to 1ms.
You can't run heavy loads at that size, but the fact that simple projects play glitch-free is great.
As machine speeds increase, you'll be able to run heavier loads at that 16-sample ASIO buffer size.

Most Thunderbolt audio interfaces are Thunderbolt-2 (the exception being the newer UA Arrow)… thus the need for the adapter.
 
The newest Macs are also using Thunderbolt-3 (so you need an adapter with those as well).
 
UA offers a Thunderbolt-3 option for the Apollo series.  I believe it's $500 for the TB3 replacement card.  
 
Thunderbolt is now fairly mature on the PC side... and it's working well.
The cables/adapters are a bit pricey.  That's about the only downside.

FWIW, I believe the original (Silver) Apollo is actually running Firewire protocol over Thunderbolt.
IOW, It's not running "PCIe via Thunderbolt"... which is necessary for PCIe level performance.
 
I've got the Apollo-8 here... and it's just fine with CbB.
If you're after lowest possible round-trip latency, that's not the Apollo-8/16's forte'.
The onboard "Unison" processing is a great feature... but it comes at the expense of slightly higher RTL.
Of course, if you'll never monitor Native EFX via software, it's certainly worth the trade-off.
 
Using the Apollo-8 at 96k, the smallest ASIO buffer size is 64-samples.
Running moderate loads of native and UAD plugins, you have to raise the ASIO buffer size to 128 or 256 samples (to avoid pops/ticks).  Same project running with Quantum (set to 32-sample ASIO buffer size) is completely glitch-free.
 
If you want to do things like run Helix Native at higher sample-rates... with ~1ms total round-trip latency, Quantum is one of the best choices.  It's absolutely rock-solid.
The only downside to Quantum is that there's zero DSP for onboard hardware monitoring/routing.
It has to be done via software (you have to open your DAW application to route/monitor).
A workaround is to use something like the Presonus Monitor Station 2.
Say you've got a guitar processor like the Axe-FX or Helix Floor. 
You could connect the Axe/Helix to your audio interface via S/PDIF... and route the analog outputs to Monitor Station.
You could then play the Axe/Helix thru your monitor speakers... without having to fire up the DAW.
 
Presonus deserves serious kudos for Quantum.
By far the best audio interface they've released.
 

Some additional information for you.
Thunderbolt on PC works well... but you've got to have all the details covered.

• Microsoft added support for "PCIe via Thunderbolt" to Windows 10 (Win7 does not support "PCIe via Thunderbolt").
• Microsoft supports "PCIe via Thunderbolt" in Windows 10... but only for Thunderbolt-3 controllers.

If you have a Thunderbolt-2 controller, it'll work for "Firewire protocol via Thunderbolt", but not for "PCIe via Thunderbolt" (necessary for PCIe level performance).
 
Most Thunderbolt-3 controllers are "add-in-cards".
The motherboard has to specifically have a Thunderbolt-3 header (connects via cable to the Thunderbolt-3 controller)... and the BIOS must support the specific Thunderbolt-3 add-in controller.
IOW, You can't just pop a Thunderbolt-3 PCIe controller card in just any motherboard.
 
Thunderbolt-3 controllers use a USB-C port (here's where it can get confusing).
A USB-C port can carry Thunderbolt or USB-3.1.
Just because a motherboard has a USB-C port/s... that doesn't mean it has Thunderbolt.
Many motherboards have USB-C port/s... that carry USB-3.1 (no Thunderbolt).
The motherboard specifically has to have a Thunderbolt-3 controller.
 
Most Thunderbolt audio interfaces are Thunderbolt-2.
The UA Arrow is an exception.  It's a newer Thunderbolt audio interface... that comes stock with Thunderbolt-3 port.
UA now offers the Thunderbolt-3 interface card for the Apollo-8/16 (~$500).
For the vast majority of Thunderbolt audio interfaces, you'll thus need a Thunderbolt-3 (USB-C port) to Thunderbolt-2 adapter.  Apple makes one for ~$50... and Startech makes one (~$20 more).  I'm not an Apple guy, but the Apple adapter has worked in every scenario we've tried (many different custom desktops and laptops).
 
 
In summary, make sure all these things are in place:

• Up-to-date install of Win10
• Thunderbolt-3 controller
• Audio Interface must have "PCIe via Thunderbolt" drivers available for Windows
• Thunderbolt-3 to Thunderbolt-2 adapter

Thanks for the info Jim.
Asrock H370 Pro4 w/ Asrock Thunderbolt 3 AIC Attached to TB Header on MB (HARD to find..mine came from Japan and took weeks to arrive...) UA Approved Startech TB2 to TB3 adaptor, W10.
 
Upon comparing an Apollo Twin Mkii on my system to the Apollo 8 Firewire Converted with TB2, the Twin Mkii does indeed seem to be running with more stability. Your comments above implied that could be the case.
 
I usually stay away from bleeding edge by using last generation CPUs and MB that are proven. This build I went for 8th gen Intel, new MB and trying to get Thunderbolt on Windows. I do think some consult time with your company would be $ well spent to give a look over this (for me) bleeding edge leap :) 
 
Thanks again for the kind sharing of info.