I have exactly the same card that you mentioned. Bought from Inet 2017-12-23, complete with its box, manuals etc. It has been in my storage since couple of months ago after I bought RTX 3080.
Jag uppgraderade 1800X --> 3950X i 370X också, kyldes av NHU12S push-pull. Idle temp ~40c, browsing/youtube ~55-65c, spelar intensiv ~65-75c, jag ser vcore gick till 1.5v :(. Men alla kärnor intensiv mjukvara i.e. Cinebench, tar mycket lägre vcore (1.05-1.1v), normalt temp också @65-70c.