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Your motherboard needs to talk to RAM at a speed not less than 333Mhz. So getting memory BELOW that speed is a problem. If you put in faster RAM, then your RAM won't be a bottleneck. It won't operate any faster than 333Mhz, but it should work.
Supported RAM Technology SDRAM, DDR SDRAM
RAM Installed ( Max ) 0 MB / 2 GB (max)
Supported RAM Speed PC2100, PC1600, PC2700, PC100, PC133
As far as I know maxiumx supported according this data is PC2700 which I belive is 333 mhz.
In fact, I'm using a slower type of memory now, but the provider says a 400 mhz would work.
Do you mean the 4000 mhz it will work but at 333 mhz, slower but safely?
The speed at which the computer will try to drive the chip is determined by the clock signal coming from the motherboard. In your case that is 333mhz.
AND IT'S SAFE, my motherboard will not explode or suffer any damage right? :)
First of all, nothing is going to blow up or be damaged. There is no harm using higher-speed memory than a system calls for.
But the mHz speed rating of memory, these days (probably for the last 10 years...) is just a convenient marketing term. The actual specification consists of a number of different ratings (perhaps a half-dozen or so) for various aspects of a memory access cycle. This is too complicated to explain to consumers, so manufacturers tag a mHz rating on it.
Pick 10 different "pc2700" modules from different manufacturers, and they are likely to each have a slightly different set of specifications. That's why there are "premium" brands or lines within a manufacturer. The most common differene in premium memory is a small number of cycles for "CAS latency".
A small ROM on the memory module is read by the BIOS, and is read to determine the specifications. The BIOS then sets-up the chip set to optimally match those specifications.
A higher-speed memory than required for a given system CAN, to some degree, offer some memory speed improvement. This may require manually setting one or more memory parameters in your BIOS setup.
For example, if you use a higher-speed memory than is required, you can often change the CAS value, say, from 3 to 2, even though the memory is rated for CAS 3. The thing is, it's rated for CAS 3 at a higher speed than you are running it at, so it can be safely run at CAS 2 at a lower clock rate.
The converse is not necessarily true. A "premium" brand of memory that is rated CAS 2 will not necessarily run at a higher speed than it's mHz specification by derating it to CAS 3.
Of course, it's all a black art, since there are a half-dozen or so different specifications to juggle, and many of them interact. Gamer sites engage on endless discussion of this subject...