Has anyone noticed any specific brands, etc of memory that won't work in a MBP. I've NEVER had any issues with the 4gb sticks - samsung, crucial, kingston. Fast forward now. The ONLY 8gb sticks *16 gb total* I've used Brandwise is Corsair. The Performance ones and also they *mac certified* ones don't work well in the MBP. They fit but are just a hair too tight that the top memory won't engage in the plastic tabs on the MBP. HOWEVER, their valueram 8gb sticks fit just fine.