Dell OptiPlex 765

Hi, I'm looking for the type of RAM and how much RAM the Dell OptiPlex 765 can upgrade to.  I've tried to look up the specs, but I can't seem to find an OptiPlex 765, yet my in-laws have one.  It only has 2GB of RAM.  I believe I read the 755 supports 8GB of DDR2 RAM, so I would think the 765 should support that  much as well.  

If someone could send me a link of the specs and/or RAM it takes, I'd really appreciate it.  I can find posts about the OptiPlex 760 too, but no 765.  I've found this regarding the 760 series, which I'd think the 765 fits into, but I'm not certain because I can't find anything about any OptiPlex 765, but I've seen the computer myself and that's what it is.  If it's the same, then it should support 8GB of DDR2 RAM as seen from here