Yess.
read the whole thing here:
http://www.theinquirer.net/?article=29533
The top end XE + C51XE has two 16x slots and 14 more, while adding RAID-5 to the drive capabilities. It is also said to be 'very overclockable'
read the whole thing here:
http://www.theinquirer.net/?article=29533