[Request] Help with ASUS P5B Deluxe - PCI-E support

[TiBreaker]

Hi@all,

I've pushed the CPU of this board near the limit with a XEON E4400, used a pin switcher and added the microcodes , nearly like posted in https://www.bios-mods.com/forum/Thread-X...P5B-Deluxe [board specification at http://www.asus.com/Motherboards/P5B_Del...fications/]. I've had no problems with this.

I've switched my graphic card to the (compared to the motherboard) quite new graphic card Palit Dual StormX 750 Ti.

Now the POST is delayed for 20 seconds (this time is needed before *any* screen display is done), obviously the graphic card and the motherboard try to find out how to work together, after the OS is up (and all drivers are clean installed) GPU-Z shows that the card works at PCI-E 4x 1.1
If I switch back to my old card [NVIDIA 7600 GT] I get an immediate turn-on and GPU-Z shows hat the old card works at PCI-E 16x 1.1.

Both the motherboard and the graphic card support PCI-E 16x 1.1 but they refuse to work together at this specification.
It's slightly disturbing that the graphic card is slowed-down a bit (it's still much faster than the old one) but it's really disturbing to wait 20 seconds before the computer actually begin to start.

Do you see any option of allowing the card to work at PCI-E 16x 1.1?
If not possible otherwise maybe "lock" the BIOS to only check for PCI-E 4x 1.1 (in the hope that this leads to an immediate startup)?

As NVIDIA says "contact the manufacturer [Palit] for getting a fixed GPU-ROM", Palit support only keeps telling "we can't do anything, this is a question of the motherboard" and ASUS refuse to give any support for this old motherboard I hope to find someone here that can either help directly or point me to possible solutions.

Thank you very much,
TiBreaker

BTW: The card works fine on other mainboards and (after my ASUS P5B deluxe has finished to start) on mine in general, too - it isn't broken, neither the MB.

Edit: Just got a BIOS update from Palit but despite of the version number string of the BIOS in GPU-Z nothing changed.