I dell tech told me I should upgrade my memory (I have a Dell XPS 400) from 512 mb to 1 gb. I presently have 2 - 256mb cards.

I checked ebay and I'm not sure exactly what is compatible with my machine.

I was told to get ddr2, sdram, 533 mhz and 2 - 256 cards.

Can anyone point to a place that could help me out and sell them to me at a reasonable price?