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Firmware Hack Option
For really adventurous hardware hackers, there is a second option that involves not only an officially unsupported hardware upgrade but also a firmware hack -- or "firmware update" if you prefer -- for the "Early 2009" Mac Pro models.
Skilled hacker "MacEFIRom" from the
Netkas Forums has released a
utility that updates the firmware in the "Early 2009" Mac Pro (
MacPro4,1) models to the same one used by the "Mid-2010" (
MacPro5,1) models.
As elaborated upon by
ArsTechnica, this later firmware provides support for faster processors and faster RAM as well as enabling audio support on the Mini DisplayPort:
Perhaps of primary interest is that users will be able to install 32nm Westmere Xeons, including six-core variants used in the high-end 2010 Mac Pro, into their older machine. Single-socket machines can use W-series CPUs, while dual-socket machines will need dual-QPI enabled chips including the E5600 and X5600-series chips. (A source who applied the firmware update told Ars that Westmere CPUs are identified with "B1" stepping in the identification code.) Even if you didn't plan to upgrade the CPU, though, there are other benefits. Some Nehalem CPUs can support 1333 MHz DRAM speeds, but are limited to 1066 MHz on the older Mac Pros. The firmware update will enable the full 1333MHz speed if you have a CPU and RAM combo that can support it. And, the updated firmware will channel audio signals through the Mini DisplayPorts on installed GPUs, making it easier to use with HDMI displays.
This firmware update reportedly is reversible, but proceed with caution. Should you apply any firmware hacks, backup everything first, and be prepared to accept any consequences."
