asus maximus extreme 290x problem

Thodorhs

Commendable
Oct 10, 2016
2
0
1,510
hi all i have an asus maxumus extreme with q9550 cpu 850w silverstone psu and a 5870 gpu i resently try to update my gpu to 290x but when the card is on the system i get black screen not even bios post i have the lastest bios update on the motherboard.dont judge me i know about bottle neck mu gpu but i wanted to start my pc update with just the gpu and then go to a mobo and cpu
 

Thodorhs

Commendable
Oct 10, 2016
2
0
1,510
psu is silverstone 850w full modular and i use one 8 pin + one 6 pin from diferent cables the bios is the lastes 1302 drivers is not a problem icant even see the bios screen but i can hear after a while the windows log in sound but again no picture i tryed difrent hdmi cables nothing again i used another psu again nothing but with my 5870+5850 crossfire running perfect is there a compatibility issues with pci-E 2.0? and the weirdest thing ever is that i have a friend that runs 270x on crossfire at exactly the same motherboard but with an older version of bios can the older bios be my solution ?