My concern here would be that the 4 modules haven't shipped, which may indicate a problem with the 4 modules... so if that is true, the 3 module avalons that shipped may not even be upgradable to 4 without a new board? Isn't it the same board used in the 3 module and 4 modules? I may be talking a little over my head at this point, and without much information from the source (Avalon)... but speculation is what you get when you don't communicate 
i thought this as well but some people with multiple avalons have frankensteined them together because of failures. i believe i've read about at least one person running 4 modules so i think the problem is something else
still no word on my 4 module order 46xx, obviously
godspeed yifu, we appreciate your hard work and wait with anticipation
