Go to your BIOS, then to Peripherals (probabaly under (advanced) chipset features), there should be an option to switch different onboard systems on and off (LAN, video, sound, I/O controllers, you name it).
No I can't see anything in the BIOS. I was just going to leave it. But since installing the new card the PC is noticeably slower when running more than 1 task. By more than one task I mean burning a disk in NERO and openening Firefox! Firefox (and IE8) can take an age when using another program. I'm not sure if this is coincedence or because nearly a 1GB of system memory is being allocated to the onboard graphics.
i think you will have to give a more credible example. it's like you're complaining the brain surgeon in the OR won't chat up about the Man.U. while a brain is worked on. you want the nero burn to be successful.
it's normal for integrated graphics to share installed system memory. the new card only adds to your flexibility. it doesn't change how the onboard graphics works.
what does the manual say about disabling onboard graphics?
Can you tell us the motherboard make and model please, ill then download the manual and tell you how to disable the onboard graphics. Just another question, did you uninstall the drivers for the onboard graphics? also did you install the drivers for the new card?