HoNY, now I can translate your article I think what you are saying is this:

25nm NAND comes in two flavors:

64Gbit (8GB)
32bit (4GB)

Due to the doubling capacity with 2Xnm NAND OCZ were able to ship drives with 64Gbit (8GB) NAND that gave the same capacity but on half the available channels.

Similar to what Intel did with the X25-V, except Intel could only do it by halving capacity as they had to use 32nm.

The upgrade trade in that OCZ subsequently offered was for an exchange to 2Xnm NAND, but with a 32Gbit die to regain the channels.

I believe there are a few other changes with IMFT 25nm NAND.

An increase in the page size to 8KB, with block sizes upped from 128 pages to 256 pages.

IMFT 25nm ClearNAND incorporates ECC into the NAND chip not the controller. On each ClearNAND device you get a 24-bit BCH ECC engine.

IMFT also supply 25nm raw NAND which does not incorporate ECC into the NAND chip.

SF controllers use RAISE, which I believe takes away usable capacity for data redundancy.