When I had Nvidia video cards installed, bought from XFX, Was able to adjust the all the fan speeds and run profiles when running gamed/video processing, and such. (Win7, x64)
It was when the (2) 8600 GT needed replacement & XFX offered either 8600 GS (downgrade) or an ATI Radeon 6750 with 1GB RAM. Went with what I thought was an upgrade and ran into a serious issue of not being able to initialize the Nvidia Performance to regulate the CPU Fan Speed.
So what I did was set the CPU fan speed to 50% with the Nvidia cards, swapped video cards for RMA replacement, and hoped the setting would stay put when I replaced the video cards with the ATI 6750. Needless to say that did not work because Nvidia Performance will not run without an Nvidia card installed. As such the CPU got hit with heat issues.

I have an OS on every HDD, in case I have an issue wit the main OS I have something to fall back on. Did this since beta testing days. Am currently inside Vista x64, recovering  from an Nvidia driver update that damaged the boot sectors on the 3TB HDD. Since am unable to locate rescue media from ages ago, and a couple of moves, have to rebuild from scratch.
In Vista x64 I can run Nvidia Performance with an ATI video card installed. No problem in Vista x64!

Installed Windows 7 x64 on a smaller HDD, did updates, installed Nvidia drivers & ATI drivers. Went to run up Nvidia Performance and received a pop-up that Nvidia Performance did not locate an Nvidia video card. Unable to run. - Something along those lines.
So in Windows 7 (x64) and unable to initialize the Nvidia Performance, and as such am unable to adjust/chance the CPU fan speed with an ATI video car installed. However I do not have the available resources to purchase an equivalent video card, unless can find something under $75 or less.

Thinking about an Nvidia GT 730 - but that fails against the Radeon 6750 in comparison. And XFX told me the 6750 is outdated, and even having a double-lifetime warranty they refused to replace it. So much for XFX's warranty.

What I need is a way to adjust the CPU Fan on this Nvidia motherboard that has the 650i chipset. I have software that can adjust the ATI video card fan speed (MSI Afterburner) and PCI Fans (XPS Thermal Monitor). However have not found anything that can adjust the CPU Fan!

SpeedFan sees the CPU is heating up but has no control over the CPU fan. Is there SOMETHING out there that can adjust the CPU's Fan with an ATI video card installed? Not sure this machine is worth upgrading due to its age, even though it is still working!

Looking for real ideas that work. Chris M?