Need help tweaking HL2 on 9600XT 256 meg

[NITRO!]

I've got around 40fps with these settings:
AMD Athlon XP 2600+ (~2GHz)
Asus Radeon 9600XT 128Mb
2x512Mb Kingston ValueRAM DDR400
Abit NF7 Mainboard
Original Catalyst drivers v5.2
Windows 2000 SP4

1024x768x32

Model detail
High

Antialising Mode
2x

Texture Detail
High

Filtering Detail
8xAF

Water Detail
Reflect all

Shader Detail
High

Shadow Detail
High

Wait for verticle sync
Enabled

So I think there must be something wrong with your comp..