Hello,
- The power supply is 700W
- I tried to install other GPUs (Nvidia Quadro FX580, Nvidia Quadro FX1800, Sapphire HD5450) but on boot i receive long beeps and red light from the power button
- I can't test the gtx 980 in another PC with Windows 7 cause I don't have another PC with sufficent PSU. I contacted the HP support call center and they told me that i can't downgrade this PC from W10 to W7(or W8).
However i've another GTX 980 and this give me the same problem.
Thanks