SC440 Q6600 showing incorrect L2cache

Hi

I just popped a Q6600 with 8MB L2 cache into my SC440 replacing an old pentium-D.

At the moment in the bios it shows up as a Q6600 but only shows 4MB L2 cache, instead of the 8MB it should show.

I have the latest bios version 1.5.0.

Also shows as this in the OS.

Any ideas?

Thanks!