Virtualbox v3.0.4. is going way too slow on one core and the slider is grayed out to disallow me from adding my second processor.
I'm not really certain why it doesn't work with 2, I've looked at some sources that say older dual-core celerons may not support hardware virtualization. Does any one know what constitutes 'older' so I can stop trying to figure this out.
On the acceleration tab, 'Enable VT-x/AMD-v' is checked, but grayed out.
The Celeron Dual Core series does not support VT-x extensions on its hardware.
Check the model of your processor against the Intel Processor Spec Finder - it should let you know if your CPU is VT-x capable.
Also, if your chip does not support VT-x, if I remember correctly, you can only use 1 core, and nothing more.
By the way, you are not going to see a massive speed increase using two cores with an XP VM. I suggest you optimize the guest operating system instead, or giving it more memory.
