Bootcamp: Source engine compatibilty

I have recently decided to upgrade my iMac to Leopard in order to use Bootcamp with Windows XP. I'm not very familiar with the whole dual boot thing, and I was wondering whether I will be able to run Source engine games (more specifically Left 4 Dead and Counter Strike: Source) on my iMac. Searching the web produced a few somewhat unhelpful comments about running aforementioned games. I'm not looking for super performance, just a bearable framerate and graphics, enough to make the games playable.

My Mac:
2.16 GHz IntelCore 2 Duo
2 GB 667 Mhz DDR2 SDRAM
ATI Radeon x1600 256 MB

Left 4 Dead Reqs:
Minimum:
Supported OS: Microsoft Windows XP / Vista / Vista64
Processor: Pentium 4 3.0GHz
Memory: 1 GB
Graphics: 128 MB, Shader model 2.0, ATI 9600, NVidia 6600 or better
Hard Drive: At least 7.5 GB of free space
Sound Card: DirectX 9.0c compatible sound card

Recommended:
Supported OS: Microsoft Windows XP / Vista / Vista64
Processor: Intel core 2 duo 2.4GHz
Memory: 1 GB
Graphics: Shader model 3.0, NVidia 7600, ATI X1600 or better

Any help, including vague speculation, would be appreciated. Thanks.

I've always found system minimum requirements for games, or for that matter, even the OS itself, to be deceptive. More realistic is the recommended requirements.

Your machine should be able to run "Left 4 Dead" without difficulty. Your graphics card, memory, and CPU are all OK. Have fun.

Regards.

Many thanks.

Your system should be able to run all Source-based games very well.