The original stick was pc4200, which is much slower than what you have now. If your corsair runs at 1.8v it has a chance of working, but why gamble? I checked one of the dell forums, and it shows the recommended ram is either pc4200 or pc5300 in various brands. The maximum capacity is 1 gb per slot. Check with the dell forum if you don't believe me. It's your money. You may be able to sell your corsair used on craigslist. Weigh the restocking fee against what you think you can get for the ram used before you try it.