I think you can replace bios, then you can boot into SD-ram directly.
There was some chinese company begining to fabricate them too, I would like to order one but instructions how to order one is sketchy at the moment.
Back in 2000 this news would kill DC-emulation server instantly, having storage/HD-connected to DC was a dream for many. I am a bit disapointed this SD-ram project seem to lack interest in some major gaming forums. Would be nice to push this idea to the maximum!