Or random access memory. I bought the wrong memory for my PC. Like a dick. I was a bit pissed when I did it, but I didn't bother to check what I already had installed. What I had was incompatible with what I bought. So it's just cost me a fiver to send it back, and I'm still no better off.
It's a bloody minefield finding the memory that will work with your motherboard, unless you want to pay through the nose for someone to fit it for you, which considering it's a pretty simple process, I'm unwilling to do.
I just want things to go a bit faster, without loads of hassle. Is that too much to ask?