No, the P4VXAD V3.1A comes with VIA 8233 chip which supports USB 1.1 only.
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Does P4VXAD V3.1A support 80GB HDD & higher?
Yes, the P4VXAD V3.1A supports hard drive capacity up to 160GB.
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Does P4VXAD support AGP 8X?
No, the P4VXAD V3.1A supports AGP mode up to 4X (1.5V only). You can install an AGP 8X card on this MB but the card will run with AGP 4X mode.
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Does the P4VXAD V3.1 support P4 Celeron D 320(2.4DG/256/533) CPU?
No, the P4VXAD V3.1 does not support P4 Celeron D CPU, that only can support CPU to 2.53GHz (FSB 533) and P4 Celeron 1.8GHz (FSB 400) with BIOS 1.3B version as attached.