LAPTOP RAM - Technical QUestion

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penmark

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Dec 25, 2005
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I bought a new Compaq Presario laptop, and the specs say it has 256mb of PC2100, (266MHZ) DDR-SDRAM, with a max capacity of 1G. So I went out and bought 1G (2-512mb modules, same specs). When I opened up the memory compartment and removed the memory the laptop came with, it was marked 256mb, DDR, 333 mhz, PC 2700.

My questions:

Are the two types of memory interchangeable?
Can using PC 2700 333 mhz harm the computer if it is meant to run PC2100, 266 mhz?
If I use the PC2100, 266mhz, will my computer run slower?
What should I do?

Thanks.

Mark
 
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If the system was running fine with PC2700 and the memory speed is being reported at 333mhz then that is what you should use for better performance. You could use the PC2100 but you would be using a slower speed of memory resulting in slower performance.

My advice to you is return the PC2100 and get PC2700.
 

penmark

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Dec 25, 2005
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how do i know what it is being reported at? the only way i know about the 333 is by reading it on the memory module itself.
 
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Download CPU-Z. It's a small free download that does not install on your computer. Once you've downloaded the file extract it. It will extract 4 items. Click on the icon that looks like a computer chip. Once open click on the memory tab and look at the frequency. If it's running at 333mhz it will show up as 166. This makes 1000 posts for me WOOOHOOOO!!!:D

By the way the reason it will show up as 166 is because this would be the base clock. Since it is DDR(Double Data Rate) it runs on the rising and falling edge of the clock cycle meaning it's effectively 333mhz.
 

JohnWill

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I suspect that they used the PC2700 simply because it was easier to get. There's no downside to using faster memory than the system needs. My guess is that you'll find out that it really does run at 133mhz.
 

penmark

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I downloaded CPU-Z with the following results: w/ the PC2700,333MHz, the frequency was 133; with the PC2100, 266MHz, the frequency was also 133; so I guess the conclusion is that even though the laptop had the 333MHz memory installed, the computer is not capable of running at that speed. Is that correct? Thanks for all your help.

Mark
 
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