Have a GA-M61P-S3 and HauppagePVR150 and XFX Nvidia7600GT.
When I install the hauppage card and the video card it works fine with the default VGA driver but locks up when I try to install the nforce video driver.
Alternately If I install the video card and driver first, it works fine but when I install the hauppage card it won't boot into windows. Will boot in safe mode. Seems others have had similar problems with gigabyte boards and a bios has fixed it but not for me (tried F4 and F5).
Did you ever figure this out? I have the same board but am trying to use the onboard vga + a Hauppauge 1800 card.
Whenever I have the hauppauge installed, the machine is very sluggish and seems to lock up at random, it doens't matter what I'm doing, could be simple file transfers from one sata drive to another or when trying to use media center/beyond tv.
I have removed the tuner card and everything boots up alot fast and has zero lockup problems.