i know mobo partially works. as you see on ECS web,
what ECS said ony version 1.0 support Q9xxx, that means other version may not support, i don't think ECS has v1.0 before's version. it just imply some X48T-A verion 1.0 do not support Q9xxx.
the satuation of my mobo is black sreen no beep first. after clear cmos, system halt with wrong time setting (system beep), but it detect CPU and Memory correct on screen! (show Q9400 and mem time setting)
F1 goto bios setting, i can not do any adjust, even do nothing after save and exit, black screen again with no beep.
do nothing after non-save and exit, system stuck on windows boot.
another CPU E6600 works fine on this mobo by a way.