Olaf van der Spek wrote:
I've already done that but that doesn't seem to help. Then the case is open and I'm closer to the fans, so they sound different.
A Nexus fan running at 1200rpm? Which Nexus is?
Real silent case fan, 120 mm, basic series
And at anyway, what do you use to drive the Scythe PWM?
MSI P45 Neo. Speedfan displays 0 rpm on idle and I think 800 rpm on load for it.
Assuming the cpu and case fans are quiet enough (even if I have some doubts about this, due to lack of details), you may just stop the PSU fan with a toothpick when your PC is running (with the side panel closed).
If you will get a better noise-profile, than more probably that not the culprit may be the video card and/or some form of a cavitation/resonance noise inside the case (due to interaction between parts).
You may also use different test to stress different parts.
I'm primarily concerned about idle noise. I've ordered a Radeon 6450 passive to test without the 4870.
Could we please get a picture of the inside of your case? I think that might help most of all, since you aren't giving us much in the way of details to work with. Also, if you have the option to use onboard graphics, you could try physically removing the graphics card and see if that helps at all.
What would you like to see/know? I can't take a picture (no cam).
I can't remove the videocard (no IGP), but I will try a passive card tomorrow.