L4VXA2 v1.0x maximum CPU and HDD supported information as below,
CPU: Pentium 4 400Mhz FSB (256K/512K L2 cache) CPU – 2.2G.
Pentium 4 533Mhz FSB (512K L2 cache) CPU – 3.06G
Celeron 400Mhz FSB (128K L2 cache) CPU – 2.8G
Yes, the L4VXA2 V1.0A 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 L4VXA2 V1.0A comes with VIA VT1612A Audio chip which supports 2 channels only.
Yes, the L4VXA2 V1.0A supports hard drive capacity up to 160GB.
The L4VXA2 does not support 128 *4 of 1G memory but 1M, 2M, 4M, 8M, 16M, 32M, 64M, 128M, x 8/16/32 DRAMs.
The L4VXA2 only supports 2.1 channel audio output. Please use 2.1 speakers for this M/B audio output. It doesn't support MS-DOS Audio driver (VIA VT1612A AC'97 Audio CODEC). Some games may come with in-box driver (Sound blaster or something else) that is compatible with this audio mode.