Le blog de Jean David TECHER, un Réunionnais à Saint-Priest/Lyon

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mardi 29 octobre 2013

Xen 4.3.0/ VGA Passthrough: Ubuntu (virtual machine), a GTX 680 hard-moded to 1/2 GRID K2, NVIDIA driver 331.17

A couple days ago I set up a VM. This is Ubuntu 12.04.3 32 bits. I have full access to my NVIDIA card. Driver 331.17 was installed.So this is just a simple demo to show that proprietary NVIDIA driver works perfectly with this card hard-moded to GRID K2. High resolutions (2 screens: 2560x1440, 1920x1080) work too
Before I set up another VM. It was Linux mint 15 64 Bits. It worked too

mardi 22 octobre 2013

Xen - Someone succeeded in soft-moding his GTX 480 to Quadro 6000

Today someone sent me a mail informing me that he was able to soft-moding his GTX 480 to Quadro 6000. I really appreciated it. As a simple reminder explanations are provided here. Here is the mail I received

vendredi 4 octobre 2013

Xen 4.3.0 VGA passthrough / GTX 670 (MSI N670GTX-PM2D2GD5) successfully hard-moded to GRID K2

Today I was able to hard-mod my MSI card to a GRID K2 by removing a few resistors. It works great as expected!

Fig 1 - MSI GTX 670 Card
I decided to do as I did last time (no soldering iron). Done in my kitchen with a simple knife and gas stove -- for fire --.

Fig 2 - PCB of my card and a knife to remove resistors. -
A knife like this one below should be Ok

Fig 3 - Knife to remove resistors. -
Here are the resistors that I removed (R1, R2 and R4)

Fig 4 - PCB Top

Fig 4 - PCB Down

lundi 23 septembre 2013

Xen 4.3.0 VGA passthrough / GTX 680 (GV-N680OC-2GD) successfully hard-moded to GRID K2

I bought a GTX 680 a couple months ago. Today I decided to have a try to hard-mode it to a GRID K2. It was pretty cool to test it:).

Gigabyte GV-N680OC-2GD
Using the links below There is a hardware modifcation to do by removing two resistors.
Notice: I am not the author of the image shown above. It has been taken from eevblog.com. Guy who did this work made a wonderfull job!

For GV-N680OC-2GD it is doable and only doable for this model

  • Removing those resistors ( 1 and 3 ) could be done easily without soldering iron. Those SMD resistors are the easiest components to remove. I did it using a screwdriver, a knife and a candle. Tweezers and a fire source should be a better choice instead of a knifer and a candle.
  • this card was sold with a BIOS version with size < 64 KB limitation. The 64-limitation is well known under Xen for VGA Passthrough. If you bought this card and want to have a try then check that the current BIOS size on the card is < 64KB. Use nvflash --save backup.rom to backup your firwmare. Else you can download the expected firmware from and restore it using nvflash

    Notice: if BIOS size is > 64KB then there is a way to shrunk to 64KB. I have never tried this method

It works very well


  • No patch required for Xen!
  • I can restart both my Linux domU 32/64 or Win7 64 without restarting dom0.
  • RAM can be set over 3GB without any problem for domUs Linux 32/64 or Win 7 64. While setting RAM > 3GB on domUs Linux 32/64 or Win 7 64 is doable then it is enough for my own projects
  • High resolution (Dual Link DVI) works pretty well with my ASUS monitor (Resolution: 2560x1440)


  • Only domU Win XP 64 is limited to 3GB of RAM else this domU gets slower. Setting RAM < 3GB for domU Win XP 64 is enough for my personal projects.
Here is a screenshot taken from my domU PV-on-HVM Linux -- Ubuntu 12.04 32 Bits --.

nvidia-settings in my virtual machine -- Ubuntu 12.04 --.