This feature in your bios is called Hardware Accelerated Virtualization(HAV). According to the intel webpage, it is intended to improve virtualization software flexibility by:
- Speeding up the transfer of platform control between the guest operating systems (OSs) and the virtual machine manager (VMM)/hypervisor
- Enabling the VMM to uniquely assign I/O devices to guest OSs
- Optimizing the network for virtualization with adapter-based acceleration
With that being stated, I do not see any way it could be beneficial with cracking, unless you are working with a virtual os with the use of either Virtual Box or VMWare Workstation. I can see where this could benefit malware reversers, since they commonly use VM's to reverse engineer hostile code.
Here are several good articles to give you insight into this technology:
Intel Article:
Code:
http://www.intel.com/content/www/us/en/virtualization/virtualization-technology/hardware-assist-virtualization-technology.html
Wikipedia:
Code:
http://en.wikipedia.org/wiki/Hardware-assisted_virtualization
The wikipedia article contains a section discussing the pros and cons of HAV.