Veritas&Equitas said:
Personally, I think your statements are off. "You've been lucky, or you have a tolerant machine." Or 7 tolerant machines (Powerbooks) in a row. Truthfully, I don't really care about the exact compatibility of the RAM; if it works, it WORKS. I read numerous customer reviews of the memory on newegg, and all of them say certain memory works with their Rev. whatever PB, and there wasn't ONE, not ONE, that says the memory didn't work in their PB.
I don't know if you always suggest Data Memory Systems because you work for them or affiliated with them, but it always seems when people have RAM questions you try to shy them away from the cheaper stuff that works just as well from newegg towards more expensive RAM somewhere else. Maybe I've just been lucky with 7 Powerbooks in a row, but the memory I've bought from newegg has worked just fine in each and every one of them. If I can save that kind of money based on a 100% track record over the past 2 years, call me stupid, or "lucky," but I'll go that route every single time thank you. Why spend at least $25-50 more for stuff that works the exact same?
I repeat: you have been lucky or you have had 7 machines in a row that were tolerant enough to take the CT12864X335 chip. This chip is what Crucial sells for about 60% of DDR Powerbooks and iBooks.
But 15" 1.0 and 1.25 GHz Powerbooks and 17" 1.0 and 1.33 GHz Powerbooks in my experience will fail with this module (whereas the 1.5 MHz and 1.67 MHz DDR machines generally will have no troubles). My experience by the way extends over 17 years and somewhere over 20,000 modules.
I agree with you, if the Crucial RAM works, it works. Just that you don't know 100% ahead of time if it will or not, so it's up to you to do the testing. If you are comfortable with doing your own work on your Mac, that's not too much of a hardship. If you are new to upgrading Macs though (as are most of the people who are asking on this forum) then the prospect of having to test and send back may be too high of a risk to save $10 - 20 per module. For those people, a guaranteed module is the better choice.
It's a bigger problem with the non-Crucial brands that NewEgg and other discounters sell such as Kingmax and Patriot etc. - these often vary in their composition week to week, so the compatibility is more variable.
The worst case scenario is that marginally compatible RAM works initially, and then an OS upgrade (such as the Tiger upgrade from 10.2/10.3) tightens the tolerances and the RAM starts throwing errors or is rejected.
My criteria for recommending Mac RAM to a MR member are
1) The vendor is reputable (NewEgg is, many eBay sellers would not be considered to be)
2) The vendor tests their RAM (NewEgg does not)
3) The vendor guarantees compatibility (NewEgg does not)
4) The RAM has a lifetime warranty (Most NewEgg RAM does, other than thier off-brand specials)
5) The vendor offers a no-cost return if it doesn't work (NewEgg has a 15% restocking fee on non-defective refunds)
I recommend Data Memory Systems because I have dealt with them for over 5 years, they meet all of the criteria, they are honest, and they know and use Macs.