The major diference between the po and non-pro is the TYPE of ram, not just the speed.
The PRO uses BGA memory modules, and depending on the makers, they ca be from Hynix, Infenion, EtronTech and Samsung, and in varying seeds from 2.8n (Hynix, whihc overclocks actually WORSE than Samsung's 2.86ns) to 3.3ns (on some Sapphire, Powercolor and Gigacube boards.. The Samsung 2.86ns memory (there are even 2 types of THAT) is what you find on BBA cards, and has the best overclocks by far.
The R9600non-pro use TSOP memory (usually Samsung 4ns), and TSOP memory is a TERRIBLE overclcocker and will definitely not get ANYWHERE near the PRO speeds (you'll be lucky to hit 220mhz let alone 300).
Also some non-pros have 64 bit memory instead of the 128 bit stuff, and then it doesn't matter which quality stuff you get it's so handicapped there's really no point.
The BGA memory overclocks well (a long as it's not already near it's max the 3.3ns stuff only OCs a SMALL bit usually, like 310mhz). Just be sure the quality you get. The BEST IMO is the Samsung (and especially the .86 ns stuff, although the 3.0 is 'ok', the Hynix clocks lower than the EtronTech, despite having equivalent (better) ratings.
The AIW uses the Samsung 2.8ns memory and comes stock clocked at 325mhz, but most PROs with the same memory should be able to reach that no problem.
Hope that helps.
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