Why won't Mac Pro 1,1 won't recognize new memory?

Hi out there. I needed a bit more memory so I got 2G of Kingston. I had ordered it from MacMall and had given my serial # and they picked it, so I am assuming it is the right memory. I have installed it in slot 3. From what I have read in the manual that is correct. I have heard conflicting things about having to install in pairs. I have 512 in slots 1 and 2 for a total of 1G before the new memory. I have taken it out and put it back in a few times, reset PRAM, etc, to no avail. So, my question is.... does it really need to be installed in pairs???? Could it just be faulty memory? I have searched the forum, and this seems to be a common problem with later models of MacPros, but I haven't seen anything about older ones like mine.
Thanks!

OK, thanks. I thought so. I wasn't sure though and when I talked to the woman at MacMall she said no. I have done a lot of biz with them and have never steered me wrong before, so I am not dissing them, but it sure would have been nice to know to begin with so I could have bought two 1Gs instead of having to buy another 2Gs. Oh well, now it will hopefully be back to being superfast.
Thanks for your quick response, I appreciate it!

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