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Anafiel
1 Nickel

M90 and PC2-6400 ram - Questions?

I think I originally posted this in the wrong forum, so please forgive me if this is redundant. 

I think I don't quite understand how this works.

So i just acquired this M90 a couple of weeks ago, and it had 2GB (2x1GB) PC2-5600 installed.  I noticed on the Dell spec sheet for the service tag for this machine that I should be able to support PC2-6400 RAM.

A friend of mine gave me a matched set of PC2-6400 sticks, so I figured, why not.  Installed them, machine runs fine.  I ran CPU-Z on the machine, and now I'm confused.  The CPU has a rated FSB of 665 MHz, and the FSBSmiley Very HappyRAM timing is 1:2, so not only is this new Ram running much slower than it can, but the stock configuration was also running below it's optimum speed.

Why was this machine limited in such a way?

How do I change the 1:2 timing so that I can take advantage of the full performance of these new modules (or any other modules)?

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2 Replies
9 Rhodium

Re: M90 and PC2-6400 ram - Questions?

This is a limitation of the Intel 945 and 965 chipsets - 667 MHz is as fast as they can run RAM, whether or not you install RAM that's capable of running faster.

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Anafiel
1 Nickel

Re: M90 and PC2-6400 ram - Questions?

But that's the point.  I'd be happy enough if the RAM ran at 667MHz, but with a FSBSmiley Very HappyRAM timing of 1:2, the RAM runs at half speed, even when running PC2-5600

Am I not reading things correctly?

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