Can I use 667 SODIMM DDR2 in a 533 laptop?

[seacave]

Merry Christmas everyone!
Hope you all had a good day.

Santa brought me a stack of Amazon vouchers to spend.
I want to upgrade the two sticks of DDR2 533 SODIMM's that are in my laptop with two 1gig sticks of the same.

However, the only 1gig sticks that amazon sell run at 667Hz:

http://www.amazon.co.uk/Kingston-Techno...-8131662-0703149?ie=UTF8&s=electronics

Can I still use these, and they will just run at 533, or is that a no no?

My laptop also supports dual-channel (acer aspire 5504) - but amazon only sells the 1gig sticks individually - i.e. not matched pairs. Do they have to be matched pairs to run dual-channel?

Thanks very much and have a great new year!

Gavin

 

[Roguestar]

The 667 sticks will run at 667 if your laptop supports it and 533 if that's its limit.

http://en.wikipedia.org/wiki/Dual_channel

 

[herbiehancock]

Like he said, they'll just default down to 533. I bought the Black Friday HP laptop special from Best Buy this year. The cpu, a Core Solo, runs at a FSB of 533. The RAM installed by HP, though, was 667. Running fine. I found out HP did this on this model because the dv6000 series uses a motherboard that can use 667 FSB chips (Core Duos) and the integrated video chip wants RAM that runs at 667 for its video speed.

So, like was said, they'll do fine.

 

[seacave]

The Cas Latency (CL) of my current SODIMM's are CL4
The new SODIMM's on amazon are CL5 - does that matter?

as for voltage table for two, I'm not sure how you get that info?

Thanks