Is the Intel GMA 4500M HD graphics chip supported, which is inside the new Dell Latitude E5500 ?
It will be support in the QNX SDP 6.4.1 release.
Can I install QNX SDP 6.4.0 and use the graphics card in an unaccelerated mode ?
Yes. You should be able to use this chipset with 6.4.0 using one of the generic drivers.