Windows 10

Note: UAD v9 or later is required for Windows 10 compatibility with UAD Thunderbolt devices

• In UAD v9.1 and later, up to four Apollo Thunderbolt interface models can be connected together (mix-and-match)
  Note: Apollo Twin USB and Apollo/Apollo 16 FireWire connections cannot be combined with Apollo Thunderbolt connections
• UAD-2 Satellite (Thunderbolt, FireWire, USB) and UAD-2 PCIe cards can be combined with each other and Apollo Thunderbolt models.
• A maximum of two UAD-2 Satellite USB devices can be connected
  Note: All compatibility requirements for UAD-2 Satellite USB still apply when used with Apollo Thunderbolt
• A maximum of two UAD-2 Satellite FireWire units can be connected
  Note: All compatibility requirements for UAD-2 Satellite FireWire still apply when used with Apollo Thunderbolt
• A total of six UAD devices can be combined in one system
  (Apollo Thunderbolt + UAD-2 PCIe + UAD-2 Satellite FireWire + UAD-2 Satellite USB + UAD-2 Satellite Thunderbolt)

Mac

• Up to four Apollo Thunderbolt interface models can be connected together (mix-and-match)
  Note: Apollo/Apollo 16 FireWire connections cannot be combined with Apollo Thunderbolt connections
• A maximum of one Apollo Twin Thunderbolt can be used in a single system
  Note: Apollo Twin USB is Windows only and cannot be combined with Apollo Thunderbolt connections
• UAD-2 Satellite Thunderbolt, UAD-2 Satellite FireWire, and UAD-2 PCIe cards can be combined with each other and Apollo Thunderbolt models
  UAD-2 Satellite USB is Windows only and cannot be used with Mac systems 
• A maximum of two UAD-2 Satellite FireWire units can be used
  Note: All compatibility requirements for UAD-2 Satellite FireWire still apply when used with Apollo Thunderbolt
• A total of six UA devices can be combined in one system
  (Apollo Thunderbolt + UAD-2 PCIe + UAD-2 Satellite FireWire + UAD-2 Satellite Thunderbolt)

Notes

• All Apollo units must be connected via Thunderbolt (Apollo connection types cannot be combined)
• Apollo Thunderbolt interface models include Apollo/Apollo 16 FireWire with Thunderbolt Option Card, Apollo Twin Thunderbolt, Apollo x6, Apollo 8, Apollo x8, Apollo 8p, Apollo x8p, Apollo 16 MkII, and Apollo x16
• A maximum of one UA desktop audio interface (Arrow, Apollo Twin, or Apollo Twin MkII) can be combined in a single Thunderbolt system.
• With first-generation FireWire rack models (silver Apollo/Apollo 16), both the original Thunderbolt 1 Option Card and the newer Thunderbolt 2 Option Card are compatible
• UAD-2 DSP Accelerators (UAD-2 PCIe cards, UAD-2 Satellite FireWire, UAD-2 Satellite USB, UAD-2 Satellite Thunderbolt) cannot be used to process UAD plug-ins in Apollo's Console application. For details, see this article.