OCZ usually uses diffeerent module withd ifferent performance characteristics in the different modules. For example OCZ4001024 ELDCGE-K gold used Winbond UTT BH-5 with 2-2-2-5 -1t timings. It could take up to 3.6 volts and overclock to 255mhz @2-2-2-5 although 240 was the max practical. OCZ4001024ELDCP-K Platinum was Samsung TCCD that was 2-2-2-5-1t at 200mhz. But relax the timings to 3-4-3-8 and you could overclock to 300mhz at 2.9volts. Performance tended to be micron chips similar to what was in ballistix. http://www.techpowerup.com/memdb/
http://www.ocforums.com/showthread.php?t=372050
What memory modules are used in which models now I haven't a clue since I don't use either DDR-1gb or DDR2. Both are decidedly inferior to the Winbond and Samsung TCCD memory.