your right quality is very important, for minimal performance gains, superior compatability, and increased stability...
but i don't seee the point of spending 390 bucks for Apacer brand when u can have 2 - 256 chips for around the same price...
having 512 will increase ur performance alot better than a single 256 apacer chip.
ive had the pc100 version of these getto chips and u can over clock them to 114 with no problems, i have 4 of the pc133's on order and i expect them to reach 147 also, which is about where i want it...
my apacer brand starts flacking after 150, but stability rocks on those chips
as for layer 6, i find it very hard to believe u can find memory with 6 layers of copper. adding 2 more layers was supposed to provide better seperation of the copper wires and therefore reduce signal degradation, but given the high cost of making 6 layers in par to 4 layers, the performance gain didn't even come close. in fact theres a real interesting story about how the first designs had 2 data layers on the outside and a power and ground layers on the inside, but that produced too much noise, so they ut 2 data layers in the middle and power and ground on the outside which worked out better...plus im no memmory engineer but having 6 layers really wouldn't help that much due to the fact that u still have the same bandwidth for data, although theoretically i suppose u could have 6 layers and reduce the number of chips to 3:2 ratio but i dunno how that would work since im no computer engineer
anyhow i have 4 of these PC133-256 chips that should ship today, the total came out to be $647.96 shipped = $161.99 per chip = i am an american badass
so in my senario quantity prevails over quality
BTW don't bother askin how i pulled it off