The reason we cant upgrade the memory of the 7650 (and never will be able to) is because the 4meg of user memory that the 7650 has is actually built into the same piece of silicon that the main processor is on, In effect you would have to upgrade the whole processor/memory chip at once and there isnt any current upgrade route for this and it looks likely that there never will be,

The specs for intel's PXA800F chip are remarkably similar to our chips spec, see below,

We all might as well give up hope of upgrading the 7650 and jst enjoy them as they are,

this is the reason why i couldnt find the correct memory chip to replace!!!



Called the PXA800F, the processor is a key component of the Intel PCA, a development blueprint for designing wireless handheld communication devices that combine voice communications and Internet access capabilities. The chip is built using a single process to place all key components onto one chip using 0.13-micron technology.

The PXA800F features a high-performance, low-power processor running at 312 MHz based on the XScale technology with 4MB of integrated On-Chip Flash memory and 512KB of SRAM. It also includes a 104MHz signal processor using the MicroSignal architecture with 512 KB of integrated On-Chip Flash memory and 64 KB of SRAM.