Since I just tried this a few days ago, I'd thought I'd report my findings. Test bed: Late 2008 Macbook Aluminum, DDR3 PC3-8500 RAM (1067MHz) Tested RAM: DDR3 PC3-10600 (1333MHz) Original RAM: Bank 0/1GB 1067 Bank 1/1GB 1067 Remove both sticks of 1067 RAM. Install 2GB 1333 in Bank 0. Reboot - successful; all systems function normally. Swap 2GB 1333 to Bank 1. Samsung 8gb Kit (2 X 4gb Ddr3l-1333 Sodimm Memory For Mac ProTested at Apples Compatibility Labs to ensure best functionality with all current products that have official Apple support for 4GB SO-DIMMs. Density: 8GB (2x4GB SO-DIMM). Patriot Signature 8GB 204-Pin DDR3 SO-DIMM DDR3 1600 (PC3 12800) Laptop Memory Model PSD38G16002S. CAS Latency: 11 Voltage: 1.5V Buffered/Registered: Unbuffered Features: Patriot Memory's Signature Line DDR3 SODIMM memory delivers the quality, reliability and performance expected for today's computer needs. This 8GB module is designed to run at PC3-12800 (1600MHz) at CAS 11 latency timings. Products 121 - 144 of 1956 - Extend the life of your Mac with a RAM upgrade today. OWC 8GB ( 2x4GB ) PC3-10600 DDR3 1333MHz SODIMM. Samsung M470T5663QZ3-CE6 2GB DDR2 PC2-5300S 667MHz SO-DIMM Laptop Memory. Buy Lenovo 8GB 2 x 4GB PC3-10600S DDR3 1333 SODIMM Laptop Memory Kit 55Y3714 Samsung: Memory. Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1600 MT/S (PC3-12800) Unbuffered SODIMM 204-Pin Memory - CT2KIT51264BF160B. (PC3-8500) SODIMM 204-Pin Memory For Mac - CT2K4G3S1067M 4.7 out of 5 stars 3,361. Customers also shopped for. Reboot - successful; all systems function normally. Mixed RAM: Bank 0/2GB 1333 Bank 1/1GB 1067 Reboot - NO BOOT swapped slots Bank 0/1GB 1067 Bank 1/2GB 1333 Reboot - NO BOOT Remove 1067 RAM. Reboot with 1x2GB 1333 - successful; all systems function normally. Reinstall 2x1GB 1067. Reboot - successful; all systems function normally. At least for the RAM I had (2x1GB 1067 Apple stock Samsung; 2GB 1333 HP stock Hynix), the system boots with all 1067 RAM or all 1333 RAM, but it will not boot if the two are combined. Samsung 8gb Kit (2 X 4gb Ddr3l-1333 Sodimm Memory For Macbook ProI have installed 2x2GB 1067 in the Macbook now, and I have 2x4GB 1067 arriving this week; I'll retest combinations with the 2GB 1333 and repost as soon as possible. As I mentioned in the Apple thread rj713 linked to above, I suspect there's a timing issue involved - the memory controller can handle downcycling the RAM, but it can't co-ordinate two different RAM speeds at the same time. Given that the Late 2008 Macbook is the first of the DDR3 systems, it would be interesting if someone with a later 1067 RAM laptop (2009 or 2010) could try an experiment like mine with mixing 1067 and 1333 RAM, and report back on the results. It may be that the memory controller (if that's the issue) is the same in all generations of the DDR3/1067 era, or it may be that later memory controllers are smarter and more powerful. Guys trust me I have been working for Processors manufacturing companies for quite a long. Always remember to check your processor before going for any ram upgrades or downgrades. RAM bus speed totally depends only and only on the Processor you macbook has. For example, if you have late 2011 13 inch macbook pro 2.4 Cori5, then simply go to the processor specification page. It clearly shows that it supports 1066/1333 MHZ pc3 rams. Now based on that you can upgrade or downgrade without even having a single inch of doubt. However, if you try to do any other experiment where you want to put in a higher bus speed or a lower bus speed ram than specified, then there are 100% chances that it wont work. Samsung 8gb Kit (2 X 4gb Ddr3l-1333 Sodimm Memory For Mac Download![]() Take my tip - whenever deciding for a RAM, get exact specs of your processor and see the RAM compatibility list as RAM is designed to serve processor only and it should be considered before buying any RAM. I have a late 2008 macbook unibody and put 2 x 4gb 1333MHz ram in and it worked, but I do get occasional program crashes, especially for games. With 4GB 1066 ram it is fine. There is a different firmware EFI update for the unibody macbook that allows it to work ok with 8GB ram, earlier updates will only support 6GB, any more causes constant system crashes. You do need a late version of Leopard at the very least to make it work as well. I think all 10.6 (Snow Leopard) variants work OK. To make things more awkward, Apple released the updated EFI with the same version number as the old one. You need version MB51.007D.B03 (look under boot ROM in system profiler).
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