What is my RAM speed?

[Nobita]

I have recently upgraded my RAM to 4GB from 2GB. But I'm not sure if my machine can take a 1Ghz RAM or 1.3 Ghz RAM. I think I bought the second one as it is backwards compatible (speed will be adjusted by the mother board).

But when looking at the system profiler:

So what gives? BTW my macbook is late 2008 aluminum unibody (the first unibody macbook)

 

[simsaladimbamba]

The logic board can not handle RAM speed of 1333MHz, thus the faster RAM is clocked down to 1066MHz, if that is what you are referring too. Nothing wrong with that, it would be strange if it would show up as 1333MHz RAM anyway.

 

[Nobita]

The logic board can not handle RAM speed of 1333MHz, thus the faster RAM is clocked down to 1066MHz, if that is what you are referring too. Nothing wrong with that, it would be strange if it would show up as 1333MHz RAM anyway.

Ok, so you mean that the logic board recognises that the ram is 1333MHz, but it know that it needs to slow it down to 1066 Mhz?

 

[simsaladimbamba]

Ok, so you mean that the logic board recognises that the ram is 1333MHz, but it know that it needs to slow it down to 1066 Mhz?

As that RAM is downwards compatible, the logic board recognises the RAM as 1066MHz RAM. If it would be able to detect 1333MHz RAM, it would be able to use it at that speed.