Is having Ethernet card...

I am using my 5 year old AMD Athon 1.53ghz.

My wireless bb gives me a ping of 20s (sometime)-under 100 ping range on my old 5 year old ethernet card PC which I am (2.4miles from the tower for my wireless.) I was wondering if getting a new PC of today with probably comes with a new Ethernet card provide a better connection and greatly decrease the ping/lower lateny with a powerful PC of today market and newest today Ethernet card that comes with it then my old 5yr old ethernet card on my old PC am using now?

I was wondering?

Thanks

Ryan