The Apple Mac Pro 4,1 (2009) Model A1289 is a high-performance computer featuring an 8-core 2.66GHz Xeon Dual CPU with 12GB of RAM.

It has:
• DDR3 ECC
• PC3-8500E (1066 MHz)
• 2GB per stick
• ECC UDIMM (server memory)
• Unbuffered ECC

So this is: DDR3-1066 ECC UDIMM (PC3-8500E)

This is correct RAM for:
• Mac Pro 4,1 (2009)
• Mac Pro 5,1 (2010–2012)

With its Xeon processor model and type, this computer offers exceptional processing power for demanding tasks such as video editing, graphic design, and multitasking.

This unit, designed by Apple, ensures reliability, quality, and compatibility with a wide range of software and peripherals.

Ideal for professional users and power users looking for a fast and powerful system for their computing needs.