" Is there any way of finding out the speed of my present memory without physically taking it out? "
If everest > motherboard > overclock > spd is not showing the module like this click here
Then if you know the motherboard make and model and the exact cpu, you can find the memory speed from the bios. It will either be listed by speed ( 133Mhz, 166 or 200 )or by spd. This is why you will need the motherboard manual and the exact cpu.