[verisimilitude]

I should have specified the model... I have a 13.3" 2.0GHz MacBook5,1. There is some variation within the 5,1 MacBooks; here's a quote from the discussion attached to that linked article (perhaps you have a 15" MacBook 5,1?)

  As far as the 15" MacBook5,1 models go – The three models released in October 2008, OWC supports to 6GB of RAM:

  MacBook Pro 15″ 2.4GHz
  MacBook Pro 15″ 2.53GHz model w/ExpressCard Slot (Late 2008)
  MacBook Pro 15″ 2.8GHz model w/ExpressCard Slot (Late 2008)

  The two models released March of 2009, OWC and Apple support up to 8GB of memory.
  MacBook Pro 15″ 2.66GHz (All)
  MacBook Pro 15″ 2.93GHz (All)

[samatman]

Nope, 13", 2.4 GHz.

Like so:

[[ Model Name: MacBook Model Identifier: MacBook5,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.4 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 8 GB Bus Speed: 1.07 GHz ]]