P5AD2 Premium specs.
| ASUS P5AD2 i925X Socket-T | |
| CPU Support | All LGA775 processors |
| Northbridge | Intel i925X 'Alderwood' |
| Memory Support | 4 slots, DDR-II only. 400MHz, 533MHz, and 600MHz support at 200MHz FSB. 4GB max, dual-channel |
| AGP | None |
| PEG16X | One slot |
| Southbridge | Intel ICH6/R |
| Audio | CMI 9880 from ICH6/R - High-definition audio |
| Audio Connectivity | 6-port backplane speaker, Optical and coaxial S/PDIF output |
| PCI | 3 x 32-bit 33MHz PCI 2.1 slots |
| PCI Express | 2 x X1 slots |
| IDE | 1 ATA133 compliant port from ICH6/R |
| IDE RAID | ITE 8212F. 2 ATA133 ports. Capable of RAID0, RAID1, RAID0+1 and JBOD modes |
| SATA | 4 ports from ICH6/R and a further 4 ports from Silicon Image 3114R controller |
| SATA RAID | RAID0 and RAID1 from Intel Matrix Storage and RAID0, RAID1, RAID0+1, RAID5 (via software patch) and JBOD from Sil3114 |
| Networking | Dual Gigabit Ethernet Controllers. Marvell 88E8001-LKJ PCI-based controller and 88E8053 PCI Express-based controller |
| Networking Wireless | Marvell 88W8310 two-chip 802.11g Wireless controller with on-board antenna port |
| USB | ICH6/R, 4 x backplane USB2.0, 4 x I/O USB2.0 |
| FireWire | 2x FireWire800(1394b) and 1x FireWire400 (1394a) from Ti TSB81BA3 OCHI controller |
| Other I/O | PS/2, Parallel |
Take a closer look at both boards' specifications. The only difference that exists between the two is in the P5AD2's (i925X) use of 2 PCI Express X1 expansion slots compared to the P5GD2's (i915P) 3. The latter makes up for this expansion shortfall by adding a third regular PCI slot.
I'm not going to specicially look at the P5AD2's BIOS and packaging. They're identical to the P5GD2's, right down to the last cable. The only obvious difference is with a manual that's intended for the P5AD2 Premium.