UA Apollo twin with SONAR?

So Universal Audio tests several DAW software for compatibility in Windows but SONAR isn't one of them. I wonder why? 
 
Also, anyone using the UA Apollo Twin MK II successfully with SPLAT? I  just got one, but may return it, as apparently you have to have a current enough MOBO that supports Thunderbolt, and if you want the latest incarnation of Thunderbolt, v. 3 an adaptor cable to boot, if I understand that right. Shoulda researched more, but the awesomeness of the plug-ins and quality of sound had me buy before maybe I should have, as my system is about 6 years old with no onboard Thunderbolt support as far as I know, and I'm unsure if an add-on card would even work (windows 10 pro 64 bit, ASUS P7P55D LE MOBO, Intel i5 quad core @ 2.66ghz, 16 gig DDR3 memory, SSD main drive, SATA 2nd drive). It's such a drag trying to keep re-purchasing things to keep this thing compatible with that thing, etc. Looking briefly into Thunderbolt ready MOBO's after the UA purchase , then I find they all take only DDR4 memory, another upgrade requiring more $$, and needless to say, my i5 may or may not even fit the newer , thunderbolt capable MOBO's CPU socket, so potentially would need new cpu, and who knows if the ever changing power supply specs for my power supply would match the connector  for the new MOBO! lol.... I have USB ports but not the type C that the UA Twin takes and probably only max at USB 2.0. Don't really feel the need to upgrade since it's never been a speed issue in SONAR. That leaves two choices, new pc/components or new interface...Thoughts?

There are problems with the Apollo on PC - UA uses thunderbolt for everything but the twin, I believe.  So it ain't SONARs fault, but trying to use the Apollo on a PC.  either return the Apollo or get a mac and learn a new DAW or get someone to build you an appropriate PC - maybe.  

There's an Apollo twin usb 3. You need usb3. If you have usb 3.0 maybe they will swap it? This is much easier than replacing a mobo. I am considering the usb 3 option since I have that connection on my mobo. 
 
EDIT- I see you don't have usb 3.0. You might still have an add in card option. 

http://www.uaudio.com/audio-interfaces/apollo.html
 
 

Why must the audio interface be an UAD?
You can work with the awesome UAD-Plugins for example via extern 2-Satellite Quad (over firwewire which works very well with SONAR). And then use any other audiointerface like RME.
I don't believe that an UAD audiointerface ist better than a standard industrie audiointerface from RME.
We work with a 2-Satellite Quad for over 2 years and its very very stable. Never had a problem (Windows 10 x64)

THE USB VERSION WORKS GREAT!  PC IMPLEMENTATIONS OF THUNDERBOPLT WORK  BUT ONLY IF THE MOTHERBOARD CAME WITH IT.  THATS MY UNDERSTANDING.   THE FIREWIRE AREN"T MADE ANYMORE BUT I USE 2 SATELLITES AS WELL A FW AND THEY WORK GREAT ALSO USING A FW 800 ADAPTER.   THERE IS NO COMPARING THE IMPLEMENTATION OF THE UAD 2 PLUGINS WITH OR WITHOUT UNISON THAT U ONLY GET WITH APPOLO. ITS A HUGE ADVANTAGE AT TIMES AND A LARGE PART OF UADS TECHNOLOGY.  I HAVE RME AS MY PRIMARY INTERFACE BUT USE THE USB TWIN FOR OVERDUBS ETC SO I CAN GET THE BENEFITS OF UNISON

TBH I don't think I've ever seen a PC interface that WOULDN'T work with Sonar if it works with other daws. They all should, and if there are problems, you can be pretty sure other daws are having the same or similar issues with that hardware. The only reported interface problems are across the board. 
 
Aside from the FW fiasco that happened awhile back, which I've been immune to BTW because I chose my cards wisely, there have only been a few issues with companies like Alesis and similar who put out a few less than stellar interfaces/drivers out there. Even in those cases many were able to make them work regardless with alternate drivers and work arounds. No one really wants to go that route though. 
 
We may be seeing some similar complications with Thunderbolt meshing well with PC. Having said that, there are many happy users of those setups too.  If you get it right, there usually aren't issues.
 
I'm glad to hear the usb twin is working well. It is a bit more costly, but worth it if you only track a few at a time plus you get all of the extra access to their great plug ins. People have moved from Focustrite to Apollo and that's saying something. 
 
I'm one of those guys that needs a major short circuit to probably trade up soon, but I've been watching these and they really caught my attention. When the day comes, Apollo will get a serious look.