#4
I just installed 8GB of 1333MHZ memory in my late 2008 Macbook. Everything is running perfectly. It even feels a little faster as well.
I tried both Corsair CMS08GX3M2A1333C9 and Crucial CT51264BC1339, both of which are 1333MHz memory. I ended up returning the Corsair memory because I ended up finding the Crucial memory $35 cheaper the next day. Both worked equally well and they both are top tier manufacturers of memory. I'd use what ever ended up cheaper.