CECHA is full hardware emulation.
Originally Posted by Sir Leonheart
CECHC is part software.
It'd be interesting to know what part of the CECHC models is emulated via software. I've got both models of PS3 and never particularly noticed any issues emulating PS2 games with the CECHC (CECHA is USA release model, CECHC is a UK release model).
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)