My server has AMD Athlon 64 3800+ with RAM 1 gb (CL 2.5 - 466 Mhz). 120 gb HDD.
It can handle 40 players at the same time without any lag. (ETPUB 7.2 mod)
My another older server is aged “PIII 800” with 768 mb antique SDRAM 133 Mhz. 20 gb stone age HDD.
It can handle at least 22 players without any lag. (ETPUB 6.5)
Yes!!! No kidding. I’ve tried 24 players and it still works well. Sure, I mean when the server is full.
All run with Ubuntu Linux 6.06. Dedicated servers, no other service is on.
So both your settings are enough for a 20 slot server. Dual Core doesn’t help because ET isn’t optimized for that but maybe you can invest for the future game. CPU are cheap anyway.
Regarding the RAM, I found my ET thread never uses more than 200 mb when 40 players are online. Add other programs and Linux core itself, you don’t need more than 512 mb. But again, 1 gb seems to be the minimum RAM you can get from the market.
Now you know ET dedicated server doesn’t require high spec. but make sure your internet connection is good enough.