Hp z800 restarts as soon as i run game

[DocNoob]

Hi guys im new to this forum. This is my second post do help me. I have HP Z800 workstation. 24gb ddr3 ram. Has a 2tb, 750gb, 500gb and 350gb sata hard drives. And 1100w approx psu. Cpu is dual intel x5650. And nvidia gtx 1080 fe.

The problem is that this gpu uses 8pin connector and this pc has 2 6pin connectors. I managed to run it by 6pin to 8pin converter. It works fine but as soon as i run a game or graphic intensive app my pc restarts suddenly. I do manage to play games with msi burner by decreasing power to 70%.

Before that gpu i had gtx 970 it used 2 6pin connectors worked totally fine. Help would be appreciated. Thanks alot.

[DGroves]

very simple question,  do you have the stock 850 watt pwr supply or the 1100 watt upgraded supply? the non "TI" 1080 cards draw up to 180 watts the "TI" up to 250 watts

a easy check is to count the GPU connectors, the stock supply has only 2 the 1100 watt has 3

the HP z series pwr supplies are "multi rail" not single rail, due to this it's possible to overload a rail (gpu in this case) while still being under the total wattage of the supply

a stock 850 watt supply (2 gpu connectors) is not recommended for a 1080 card but should work if the system is not fully loaded with options

the upgraded 1100 watt supply (3 gpu connectors) will work, but with either supply it's required that you use the two separate gpu supply rails so for the 850 watt supply you may need a Molex to 6Pin adapter and a 6 to 8 pin adapter on the pwr supply 6 pin gpu connector

the 1100 watt supply has 2 six pin connectors on one rail  and the sec rail has one gpu 6 pin connector

DO NOT CONNECT/USE BOTH 6 pin connectors on a single rail,  look at the power supply label or the service manual to id which connector(s) are on which rail

as i recall G1/G2 are on one rail and G3 is on the sec rail (but i could be wrong so check)

as long as the 1100 watt supply powering the 1080 is using both pwr supply rails you should have no problems

[DocNoob]

Thanks for the reply. I see that it is 1100 watt supply but only see 2 6pin gpu connectors. I will try to find the other if thats the case. Thanks alot for the help. Mich appreciated

[DocNoob]

Also please guide me if i dont find the 3rd 6pin connector