AGP Fast Writes on a Mobility Radeon7500 64MB DDR

Just a quick question for the hardware tweakers of this group, I have a laptop running the Mobility Radeon7500 64mb DDR video card on the Intel 845MP chipset and while running a few benchmark programs lately I noticed that they were all saying that the Fast Writes option for the AGP port is disabled. I know what the fast writes option is and what it does, I also know that my hardware fully supports it. So I was wondering how I can enable the Fast Wites option? On my desktop PC this option is in the Bios under chipset features, But being the fact that this is a laptop and has an Intel mainboard the system Bios is quite limited and doesn't have this option anywhere in it, but is there perhaps a registry setting, Driver tweak or something that can still be used to enable the fast writes feature?

The bios on said laptop works the same as any desktop PC bios and has the majority of features common to all intel chipsets from what I can see, But the only options that you can change in the bios reguarding the AGP port is the aperature size and transfer mode(1x/2x/4x). I currently have it running at 4xAGP with a 256MB Aperature which is half my system memory.

The laptop is made by AlienWare and has a P4 2.4GHZ CPU & 512MB of 266MHZ CL2 DDR MEM. Im currently running WinXP Pro with all the current updates and the video drivers provided by AlienWare on their web page. I have tried using lots of different drivers including the most current version that is on ati.com but the system runs with Fast Writes disabled no matter which driver I use. Im pretty sure that this is more of a mainboard issue than a video card issue but I haven't been able to find much info since laptop tweaking isn't all that popular or common. I would really appreciate any help or direction you people can give me on this issue....

This will tell you a little more about the laptop...
http://www.alienware.com/main/syst [...] ea51-m.asp



Thanks in advance for any help you can give,

CALIGULA AZ
77530161