AGP aperture settings

[Broon]

Hi all, hope somebody will be able to help. I'm trying to play an older game on my pc and can't get it to run. It installed without a hiccup but whenever I try to run it I get an error saying something like "AGP aperture setting ioncorrect, please restart and use the BIOS to set the aperture to at least 256MB". Initially I was like WTF I've got a PCI-e graphics card.

After a bit of digging I've discovered that it's nothing to do with AGP ports but is actually a setting that works on a BIOS level and acts kind of like a page file for your graphics card. I could find no such setting in my BIOS From what I can see this setting appears to have been phased out. So I know this is a long shot but I'm open to any ideas.

Thanks in advance for any help

EDIT:

My motherboard is an ASUS m4n78 Pro and my graphics card a 5770.

 

[Hagar]

I think it used to be about 25 - 50% of system ram when you had anything from 32Mb to 256Mb of PC100. I have looked in your manual and it could be the frame buffer setting iGPU, but am not sure.

 

[Broon]

Oh yeah, forgot to mention I've got 4GB RAM, 3.25 showing up because I'm using 32-bit windows.

I missed that setting when I was looking before, thanks. At work atm but will try when I get home and let you know.