Need help deciphering RAM numbers

[SparkyJJO]

OK I picked up two RAM sticks, I know they are PC100 but they only say 4x64 and 8x64. How do I determine how large they are? I use DDR in my PC so I can't really test them to find out.

I feel stupid for not knowing this but O well

 

[SchrodingersDog]

I'll move it for ya, just a sec.

 

[Demon-Xanth]

4Mx64bits and 8Mx64 bits. 8 bits to a byte.

 

[SparkyJJO]

right, 4Mx64 (I forgot the M in my post, oops). So a 4Mx64 is a 32MB stick and a 8Mx64 is a 64MB stick?