Main diff

xtreme5

Distinguished
c43 has
SATA2 ports support RAID 0/1/5/10 mode by Intel P67
SATA3 ports support RAID 0/1 mode by Intel P67

c45 has
SATA1~2 support Intel Matrix Storage Technology (AHCI/ RAID 0/ 1) by Intel P67
SATA3~6 support Intel Matrix Storage Technology (AHCI/ RAID 0/ 1/ 5/ 10) by Intel P6

otherwise they are entirely same.