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Problems have been reported by users who have used third party RAM that had normal sized FB-DIMM heatsinks.

While electrically the FB-DIMMs are standard, for pre-2008 Mac Pro models Apple requests that users use larger-than-normal heatsinks on the memory modules that they install. With a simple install of a single FB-DIMM the peak bandwidth is 8 GB/s, but this can increase to 16 GB/s by installing two FB-DIMMs, one on each of the two buses, which is the default configuration from Apple. Notably, due to its FB-DIMM architecture, installing more RAM in the Mac Pro will improve its memory bandwidth, but may also increase its memory latency. The cards have 4 DIMM slots each, allowing a total of 32 GB of memory (8 × 4 GB) to be installed. In the original and 2008 models, these modules are installed in pairs, one each on two riser cards. The original Mac Pro's main memory used 667 MHz DDR2 ECC FB-DIMMs the early 2008 model used 800 MHz ECC DDR2 FB-DIMMS, the current Mac Pro uses 1066 MHz DDR3 ECC DIMMs for the standard models, and 1333 MHz DDR3 ECC DIMMs for systems configured with a 2.66 GHz or faster processors. All current Mac Pro processors are capable of Intel's Turbo Boost technology, which dynamically boosts the clock rate of a core in intervals of 133 MHz if the CPU temperature is below average conditions. The four core versions come with 8MB of Intel Smart cache (元 cache) while all others come with 12MB for each processor. As an example the eight core standard configuration Mac Pro uses two Quad core x8 Intel E5620007 Xeon processors but can be configured with two Hexacore Core Intel Xeon Processor X5670 All current Mac Pros have processors supporting Hyper-Threading which allows two threads to run on each core.

The current Mac Pro is available with one or two processors with options giving four, eight, or twelve cores. Description The specifications below are from Apple's "tech specs" page or developer notes, except where noted.