It sounds like a jet taking off...no joke. It's kinda getting annoying. I noticed it making a lot of noise when I switched power supplies. It's seems like it's going 2000+rpm and it's constantly making an even shhhhhhhhhhhhhhhhh noise.
I just wondered if there's anything I can do to it to lower it's rpm's.
It's not usual to have a just new power supply affect the speed of the CPU cooler fan.
I wonder if the CPU cooler might have got knocked around, jarred when the case moved or otherwise shook loose so it's not contacting the CPU correctly. If the CPU is running hotter than before - it's what is making the CPU run faster trying to cool off that hot CPU.
It's a high idle temp - that's for sure. And its probably the reason your CPU fan is screaming along at 3300rpm instead of the more normal 1000rpm.
As long as you're just testing with the video card in idle load it should be perfectly safe.
It's only when you'd crank up a 3D gaming session that the 5670 would draw a lot of power.
There's a good chance your 5670 draws less power (about 15 watts) at idle load compared to your old card.
I think you'll find that the CPU fan works the same speed no matter what PSU is hooked up.
Check that in changing out parts the power cable to the fan on your cpu didn't get shifted around. What happens a lot of the time that causes this noise is that the blades are actually hitting a wire. If that is the case just pull back the cables and tie them in a way that they aren't going to be close to the blades.
check the bios to see if there are any options for controlling temp. I'm thinking that during the full power outage caused by the psu removal, the bios settings might not have been maintained, for everything else cpu, memory, hdd, they would auto configure.
it would be an indication that your cmos battery is dead/dying? which given the age of a d945 it could be.
You don't want to arbitrarily lower your fan speed, especially with such a high idle temp. The CPU cooler coming loose as WR2 suggested might explain that.
And, an Earthwatts 430 wouldn't even break a sweat on that system, so no worries there.