*900MHz memory on 65nm is possible and completely stable on mine.
650 on core is accurate, even if some 20XX can do more (700) depending on the NEC Tokins health.
25XX models have 3 different RSX revisions. What would be interesting is to know exactly which revision we have in each model, associate them with dates and see how they respond to OC.
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Also, if we put a EADP-220BB or APS-250 power supply in a 25XX model, I wonder if they would be able to handle a bit more (since they should bring more stability overall).
EADP 200DB / APS-270 (21XX and 25XX) : 12V 16A (192W)
EADP-220BB / APS-250 (20XX) : 12V 18A (216W)
I'm currently trying to find a 25XX slim btw.