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The PXA255's are SUBSTANTIALLY faster than the PXA250's, if the system if configured to maximize their performance. The e750 is a device that does so, but the Dell Axim is supplemented ever so slightly with the PXA255 since it's ram speed remains the same and therefore is a bottleneck for the system.
Btw not only is the PXA255 300Mhz faster than the PXA250 400Mhz it is also faster than the PXA250 overclocked to 472Mhz. This is how big the margin of performance is.
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