Left 4 Dead on low spec PC?

[Sone]

I am missing my old source games and i am thinking of buying a cheap machine out here. Not interested in anything newer.

Would a Athlon LE-1640 (2.7ghz), 4gb, and a Geforce 9500GT play this on medium settings?

 

[Sone]

Just been offered a machine like this for $300 with monitor etc. If it will play left 4 dead thinking of getting it rather than spending $1000+ on a new machine.