There is no such thing as 'high performance' RAM. For a given set of specifications ALL RAM will perform the same way. The differences primarily lie in manufacturing quality standards. Some vendor provide RAM that is tested more thoroughly than others. Consequently RAM problems occur less with the RAM that they provide as opposed to some vendors 'economy' RAM.
Most problems occur when the user deviates from the specifications for a given Mac. Its like putting in a larger engine in a car. You then have to alter the engine mounts , wiring, transmission etc. Its not just the engine that must be taken into consideration, the entire system has to be viewed as an integrated whole.
Customer service is one of the reasons I favor OWC and Crucial. If you get faulty RAM, one wants to get the matter resolved quickly. If you have RAM problems bought from OWC, they will send replacement RAM immediately. They will not wait for you to return your faulty RAM. In addition they have a technical staff that is competent and responsive. I have consulted with them on several occasions to solve problems or simply get more detailed information.
Ciao.