Thanks for the info
VT-x improves virtualisation support for intel processors (check for "VT-x" or "Vanderpool" or "HAV" technology or something similar in the BIOS)
x86 virtualization - Wikipedia, the free encyclopedia
It's just used by Vbox and seen in the acceleration tab.
View attachment 6274
I think your system (as seen in yous specs here on site) has VT-x
But VT-x is not really required.
It will make your VM work faster, that's all.
So the real problem is the graphic acceleration. Virtualbox installs the VDDM driver for 3D support by default in the latest versions and it's a buggy driver and still in developpment. The screen flickering it's normal (i'm serious). They still fix crashes for the aero interface but with the latest version (Vbox 4.1.16) the glitches got worse.
If 3D is enabled, Vbox installs
VDDM driver by default.
It will work after some change of settings but the 3D gaming and acceleration is still unstable and metro apps can crash, but there is basic support and you can mount shared folders and
auto-resize the screen.
Install the latest Virtualbox (now 4.1.16) from
https://www.virtualbox.org/wiki/Downloads
and the extension pack (for usb 2.0)...
If you already use the latest version:
Go (in the Win 8 VM) to System -> Advanced system settings -> Settings -> Adjust for best performance
You can the enable some features like this:
View attachment 6275
It' s better than the standard settings with animations (standard settings will work bad on Vbox => especially with 4.1.16)
Then install the additions in your virtual machine (leave 3D acceleration enabled if you still use 256mb) -> try with 128mb because the VM still uses limited support without dedicated memory (like in the case of VMware Player 3D)
Reboot and it will work nice (the flickering should be gone by now).
Some flickering it's still possible due to the driver's status but should work pretty good (works for me in Vbox 4.1.16 on Win7 x64)
If it still flickers badly (or constantly) try disabling 3D in Vbox settings and remove the VDDM (Vbox display adapter) in the VM's Device Manager (Drivers)
the reboot the VM without 3D support.
I'm using the VDDM (3D support) because it 's getting better and better and after applying the fix i've mentioned it should work without flickering.
Don't use applications that mostly require 3D on Virtualbox because there are limitations (3D support is still experimental and crashes and lacks in performance are daily issues)
I think it's clarified by now. So the flickering is normal with the current Vbox drivers (look always for newer versions of Vbox and the chance is they fix some 3D support a bit). Try the fix with the Performance Options as sen in screenshot above.
Sorry if I wrote too much in this post but it should work (with 3D support or not).
Good luck with the installation.
Regards
Hopachi