|Thank you both. This is a Lenovo Thinkcenter desktop J200 96905AU 32-bit Windows 7|
I've tried SIW and it agrees with the system info I was getting off the computer. DDR2 PC2-6400, 400Mhz (DDR2 800Mhz) in spite of what Lenovo website says about this model.
But either way, I can't add another 2Gb card because of it being 32-bit?