What difference does it make (6ns or 7ns memory)?

[JettaJack]

so can someone please tell me?

 

[Dark4ng3l]

The max ated speed of 7 ns is 133(I think) and 6 ns is 166

 

[AndyHui]

Maximum rated speed is 143MHz for 7ns and 166MHz for 6ns. If you want to overclock the RAM, always go for the lower ns number, as it will be able to handle higher speeds.