Memory upgrade FSB speed question

I recently bought a cheap laptop for web surfing and word processing. This is a new laptop that has an Intel Dual Core T2130 (Yonah-based) chip in it with the older pre-santa rosa 945gm chipset. The T2130 FSB speed is 533Mhz. I ordered a memory upgrade DDR2-PC4200 CAS 4 533Mhz FSB 2x1GB which was compatible. However now that I received the laptop I see it shipped with 1GB (2x512MB) DDR2-PC5300 CAS 5 667MHz FSB memory. I intend to replace both sticks but is the fact the FSB speed is higher an issue or will I be fine with the memory upgrade I ordered. I assume they use this same memory for several configurations and processors with 667MHz FSB. The cas latency is actually 4 for the 533MHz memory vs cas 5 for the memory they shipped with it. I assumed it was better to match the FSB speeds but I did not know for sure.

 

From memory, i think that the RAM would just clock itself down to 533mhz to match your FSB of your processor although your chipset supports 667mhz. There is no need to wory about buying ram with 667mhz to match the pre-built laptop.

What i mean is that your processor supports 533, so your ram or 667 ram would just be wasted.

-edit- not wasted but it would only clock down to 533mhz anyways.

 

It would automatically underclock to 553MHz just like a real one.
All DD2 sticks are backwards compatible.

 

So the 533 FSB Cas 4 2GB upgrade I bought is really better than a 667 FSB upgrade because it would just clock down anyway right?

 

The 667 will clock down to 533 because your motherboard/cpu cannot take that speed. If you buy a 533 and 667 stick, the 667 would clock down to 533. Both sticks will perform at the same speed.