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GigaByte gtx 770 2gb Not detected

GigaByte gtx 770 2gb Not detected
« on: September 03, 2013, 09:51:53 am »
Hi to all,

My system is :

MotherBoard: MSI H87-G43
RAM: Corsair 1600hz 2x4GB
Processor: i5-4670
Graphic Card: GA GTX 770OC 2GB

If i put my old graphic card (ati 4850 in PCI-E 3.0) the system works fine, but i i put my new GC , the IGP go and in the bios (explorer motherboard) the slot of PCI-E is empty, but i saw that if i put gtx 770 in the IGP there are new option which Integrate memory shared and DVTM (for maximum memory for 2d/3d app). My bios is updated to 2.3 MSI7816 version.
UEFI or Legacy or Secure for BIOS can be a problem? Help me please