msi 8340 burn speed limits

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Greetings, any help here would be greatly appreciated.

I have an msi 8340 burner, 40,12 48.
i am having problems with my burn speed settings with alcohol and nero.
It keeps defaulting to 16x as the max burning speed, it is not a media limitation, as the drop down boxes don't even show anything above the 16x speed this is before the programs even inspect the disc.
I have flashed the burner with the latest firmware.
Usually don't have these kinds of problems, gettin frustrated!

msi 845 ge max mobo
2 x maxtor 80 gig drives
geforce4 ti4200 128 meg ram agp 8x version
1 gig ddr