There is actually the same amount of memory in both 7750 and 7780. Apparently, the 7750 memory is used up by more bloaty CDMA software. CDMA requires a lot more processing than GSM, while CDMA is excellent for many things, processing overhead and battery life is not an advantage of CDMA -- you really need a faster CPU to handle the rigors of CDMA.
Given a fast enough CPU processor, CDMA is faster than GSM. But with an underpowered processor, GSM is faster than CDMA. The 7750/7780 processor is somewhat underpowered for good CDMA performance.
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