cabana :
Yes, it is not constant, it varies, but my actions or the performance of the CPU or GPU does not influence it ... First i thought it was the HDD because its old its a sata with 300g/s
It might be the CPU fan, if it started with the new heatsink fan, then it is a possibility. But you can try by unplugging a component one at a time and going into BIOS to see if the sound was eliminated. If you unplug the CPU or GPU fan headers, I don't really recommend it-but if you do, make sure to turn off the PC ASAP. But I highly advise not to. sometimes the AMD heatsinks have a high pitch noise at lower RPMs though, so going to ~1500+ should eliminate it. Not sure how the 8350 is, but my stock 8120 was 6000 RPM, and at <1200 it had a similar issue. Wasn't really a high pitch noise as much as an annoying hum. (At it got LOUD at 6000RPM :lol
But you can have a different problem.
But regardless, I advise switching out the stock heatsink.
A good choice would be the CM 212 EVO for 30 dollars, quiet, cheap and very efficient.