okay fellas, anyone tried 8 gb in their 2009 15 " mac book pro? If so can you post results? Here are complete specs: Processor speed: - 2.53 GHz Processor Type: - Intel Core 2 Duo (Penryn) Number of Cores: - 2 Bus Speed: - 1067 MHz Cache: - 6 MB L2 cache 64-bit Support: - Yes Installed RAM: - 4 GB (2x2) Max. Amount: - 4.0 GB Amount of Slots: - 2 RAM Speed: - 1067 MHz RAM Type: - PC3-8500, DDR3, SO-DIMM I've heard that the Nuram can cause flicker. Anyone??