I dont play 1.6, as I hate steam. I've had nothing but problems with it. I won't even begin to say what, it angers me too much. I try not to think about it. FPN (the gaming network I'm admin on) is aggravated at steam as well, and we're cutting down on most of 1.6 servers, and only offering 1 CS 1.6 server once WON.net goes down. We're fed up. But I'm ranting....
Soooo...yes, you would probably need a more powerful machine if you're planning on playing CS 1.6. If you want my opinion, ditch CS. It's dead. BF1942/RTCW:ET/AA is what's in.
(here comes cheap promo)
If you want a nice place to play online games,
www.fastping.net. Expect our servers to be up within the next few weeks. We're working on a BF1942 server, and possibly America's Army. There is a public RTCW:ET server up, with a Q3 server coming very soon (had a few problems with the server its running on, nothing extreme. expect it up VERY soon)