Max Memory for the Unibody Macbook Pro 2.8 Ghz

"Take the confusion out of the issue. What does Crucial or Kingston say about the memory capacity of the computer?

The manufacturers manual is a snapshot in time, it only reflects what the manufacturer tested, when the manual was being written. They are rarely updated, unless a new version of the computer / motherboard / etc comes out.

Kingston & Crucial are willing to test with newer memory chipsets, etc. So if they say your model will accept more, then it should work.

From Crucial:

Manufacturer Specifications - Apple MacBook Pro 2.8GHz Intel Core 2 Duo (15-inch DDR3) Mid-2009

Number of Slots:
Slot 1
Slot 2

*Not to exceed manufacturer supported memory.

Drive Form Factor: 2.5""
Drive Interface: SATA
Maximum Memory: 8192MB
Slots: 2 (2 banks of 1)
Standard Memory: 4096MB removable
USB Support: 2.x Compliant

Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules."