upgrade my iMac 24" 2134

you want to put 8 gigs of RAM and a hard disk SSD if you can, my question is the computer I have is a imac24 "EMC Code 2134 can be also the last operating system mac os the Tosemite 10.10.4 , which have now is Mac OS X 10.5.8 , 2.8 GHz Intel Core 2 Duo