gigabyte r9 270x wont bootup with intel q45 dp45sg

Raiad Anwaar

Reputable
Apr 19, 2015
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I have dp45sg intel mobo
Q45 chipset
Chieftec 650w psu
2x2 gb ddr3 ram
Q6600 stock clocks!
Recently bought gigabyte r9 270x 4gb
Mein pc no even goes to bios when i plug out the gpu it gives me the beeps that show it has gone past bios !
But with gpu in no display and no nothing not even the mouse gives its led ! But the fans and every thing are spinning.
Tried another gpu with no six pin that was also gigabyte and it also didnt worked ! Then tried xfx gts 250 with 2 6 pin and it worked !
Another hd 6750 sapphire with 1 6 pin and it also worked !
I dun know is this with the gigabyte or what?