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2.4 ghz mac worth upgrading?

My office iMac from 2007-2.4ghz intel core duo
2gb ram
CMC IT put version 10.11.3 on it, and now is so slow, is unusable. Am getting a new iMac, but is this present model at all worth keeping if more memory added?
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In my experience, an extremely sluggish and "unusable" experience on an iMac usually means dead hard drive. 9 out of 10 times its a failed drive. Not an absence of additional ram. That said, considering the age of the machine, it's very close to borderline not really worth the cost of the replacement drive ($260) at this point. The max ram on that model is 4 gigs. That would of course help. www.crucial.com is a great place to buy ram. 4 gigs on that older model shouldn't cost much at all.
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