How not to order RAM

So, back in June or so, I ordered four sticks of 2GBs of RAM for my main workstation, DDR2 PC6400. Couldn't wait to get them right? So, a month goes by and they finally come in. Now, the board I have right now is a Supermicro X6DVL-EG2 which accepts ECC RAM. I thought my current RAM was non-ECC so I said fuck it and ordered non-ECC RAM. Wrong. RAM came in, tried it, motherboard beeped at me. Fuck. So I sent it back out east for a refund (to Newegg). A week or two goes by until I get the refund so I go ahead and order DDR2 PC6400 RAM.