I just recently picked up a 2010 Unibody Macbook. It came with the stock 2gb of RAM. It runs Snow Leopard great, but is absolutely painful on Sierra. I know the computer is capable of better, as I've run Sierra on worse hardware. I think a first step is to get more RAM in it, as the memory pressure is hovering between yellow and red with a lot of page outs. I have 4gb of Hynix RAM that shipped in my late 2011 MBP and had planned to drop that in, but the computer refuses to boot with it(I've gone through diagnostics with trying the sticks individual in the two different RAM slots). I only get a single beep on start-up. A friend advised me that these computers are "picky" about RAM, and as this isn't a primary machine I just want to get enough in to get it useable. Given the current price difference between 2x4 and 2x8, I'd prefer to either buy 2x2 or 2x8 for this computer. Can anyone suggest particular brands and P/Ns of RAM that they have had working in these computers? The OEM RAM is Micron, which I'm guessing might be a safe bet.