Downside with Internal:
-Dali gyud tinuod guba internal modem. Naa ko'y external 7years na, Cnet brand, wala pa naguba hangtud ron, mas-una pa naguba ang internal sa ako amigo after a yr.
Speedwise sa External?ok gihapon, same with internal...
Btw, downsides with external are:
-If you plan to pull the plugs after use, kapoy sige ibot-ibot
-If dili nimo ma-on before startup using Win XP, balik nasad ka restart then i-on nimo modem kay dili madetect if dili "on" on startup. (This is by the way kung using Serial Port imo modem, if usb, mura ok ra)
-Needs space in your computer table(Pero gamay ragud)
Pero External gihapon ako choice....