My computer at home has been quite slow lately -- probably due to the fact that every bit of software you install wants to put a stub in memory to "detect" some action or make it come up faster. Over time, it has gotten to the point where I'm routinely using 700MB out of the 512MB I have. This is not good.
So I decided to order a gig of memory. It's PC2700, 333MHz, DDR memory. Figured that's all I needed to know.
Apparently not. I went through an Ebay vendor called BzBoyz because they advertised their pride in their support after the sale.
Good thing they weren't lying. It turns out I ordered high density memory. My motherboard won't take it. But, even though it was my mistake, they are taking it back and sending me a low density stick that'll work -- I just have to pay the difference.
They've been very helpful and willing to get me what I need.