L4IPEA2 v1.x, maximum CPU and HDD supported information as below,
CPU: Pentium 4 400Mhz FSB (256K/512K L2 cache) CPU – 2.0G
Pentium 4 533Mhz FSB (512K L2 cache) CPU – 2.8G
Pentium 4 533Mhz FSB (512MB/1M L2 cache) HT CPU – 3.06G
Celeron 400Mhz FSB (128K L2 cache) CPU – 2.8G
Yes, the L4IPEA2 V1.1 supports Intel's Hyper-Threading technology. If you install a CPU with Hyper-Threading such as P4 3.06G on this MB, there is "Hyper-Threading technology" item in BIOS to let you enable or disable this new feature.
The L4IPEA2 V1.1 is built in CMI 9739 Audio chip with additional Dolby Digital decoder which supports up to 6 channels.
Yes, the L4IPEA2 V1.1 comes with Intel ICH4 chip which supports USB 2.0.
Yes, the L4IPEA2 V1.1 supports hard drive capacity up to 160GB.
No, the P4IPEA2 V1.1 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.