In addition to Thunderbolt, Apple offers four USB 3.0 ports on the Mac Pro, though with Thunderbolt you should be able to add a massive collection of USB, FireWire, audio, Ethernet, and practically any other I/O technology to the system. This impressive number of ports should offer the connectivity that most people will need, through external PCI Express enclosures that can host external video cards as well as specialized equipment, and RAID arrays for high-throughput data storage. Unlike any Mac before it, the new Mac Pro will offer over three times the number of Thunderbolt connections, giving access to next-generation Thunderbolt 2 that runs at 20Gb/sec, and is managed by three independent controllers. Overall, these details and the design of the new Mac Pro very clearly point out that besides RAM, expandability is intended to be done through one route: Thunderbolt. Mac Pro memory expansion offers four slots for upgrades. Apple so far has not given any specifications on the provided RAM in the systems, but in its Core Technologies Overview it mentions that the kernel in OS X Mavericks supports addressing up to 128GB of RAM.
Apple has stuck with the traditional RAM slots, and provides four slots for adding more RAM modules to the system. However, the RAM on the new systems will be upgradable. While third-party replacements and upgrades may become available, as with the current MacBook Pro and MacBook Air they will likely be limited and few in number. This means that you will not be able to get a 2.5-inch drive from OCZ, OWC, Intel, or other manufacturers and plop it in the system. While the system will be entirely Flash-based and therefore fast, as is the case with the MacBook Air and MacBook Pro with Retina Display, Apple is using an alternative daughter card design for the system's flash drive. In addition to limited video card options, the new Mac Pro also will have some limitations with internal hard drive upgrades. To attach components to its unified thermal core, the video cards and other system boards follow unique designs, making them more difficult if not impossible to replace or upgrade.
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