Hi
Without the exact model of laptop it is unlikely anyone can give you any meaningful advice
I have not heard of any modern laptop using a standard PCI-express x16 slot or taking a standard desktop size graphics card
If Dell offers your range of laptops with a range of Graphics cards then there is a reasonable chance of success
(assuming there are faster graphics cards available)
It would be a lot easier & cheaper to find out why the laptop crashes
How long does it take before crashing?
(Is this overheating?)
Have you any thermal monitoring software for CPU & GPU ?
Does it crash playing other graphic intensive games ?
What operating System (& service pack) ?
Why use a beta release of driver ?
(unless it fixes a problem which you have)
Have you tried un-installing the Radeon driver software (not upgrading)
and installing the latest driver on the Dell Site or the latest stable release) from AMD for your Windows
AMD have a utility to check if their driver is compatible with OEM Mobile Radeon hardware
http://support.amd.com/us/gpudownload/windows/Pages/radeonmob_win7-32.aspx
regards
Mike Barnes