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I don't want to buy it then find out it doesn't work. I have a 256Mb stick in the machine at the moment and its DDR PC2700 - CL 2.5 - 32M x 64. Which is the same as the above Corsair stick. So it should be OK right?
The only way to make sure it works is to check out the manufacturers website. and make sure it specifically says it will work in that model of dell. If you don't have that assurance - do not just go with 'the same specs'. Dells are notorious about being finicky with memory (speaking from extended experience here). In fact, with Dells, if you don't have direct from the manufacturer 'works on the 2400', I'd bet that the memory *won't* work.
That being said, there are certain companies which will offer a guarantee that the memory will work, my favorite being crucial.com. Prices are reasonable, free 2nd day shipping, and if you use the advisor tool, they guarantee the memory will work.