Well you understand it wrong. There is no extra testing apple does with it's RAM. All 200-Pin DDR2 SO-DIMM RAM will work in the Macbook, there isn't any extra compatibility with Apple RAM, it's the exact same stuff.
Err all RAM is not equal. RAM is not made in one large factory and then branded with different logos, RAM undergoes a lot of R&D from its respective manufacturers. If you were ever into building computers you would know that RAM from more respected manufacturers is extremely important in areas like overclocking. And I'm not talking about different speeds, or DDR2 vs. DDR3, I'm talking about RAM of identical speed. Good luck on that using Generic RAM.
As for your back in the PPC days... That was just idiotic, any RAM that was used by the computer, 200 Pin RDDR2, 240 pin, whatever, would work with PPC computers. There's nothing magical about Macs, they're just computers and they just need the RAM that is compatible with it.
Well let me put it like this. I've heard a lot less moaning about RAM compatibility since Apple moved to Intel. I do not have anything to back that up with at all, and there is likely no explanation on the planet as to why. This is purely what I have seen working in various stores.
PS: thanks for not doing any research and saying what you've "heard" as fact. It really makes other people who believe you look as dumb as.... well...
I never said anything that I heard. I stated information that I had read from many respected people, combined with my own outlook on the subject, and from what I had seen working at various computer stores. I then formed an opinion.
When you buy Apple RAM, you are guaranteed to be buying RAM that is 100% compatible with your computer. Regardless of the fact if 99% of all other RAM would work flawlessly. And this guarantee is extremely important for some people who spend millions of dollars on equipment in professional situations.