What's the problem?

CPU: Intel core i3 2100 3.10 ghz
Graphics card(recently bought):Gtx 960 gaming 4gb
Motherboard: asus p8h61-mx
RAM: 2x2(know a little)
Hard:1TB
Power supply: 450w power man ip-s450hq7-0
Problem:
PSU only have one 6 pin psi-e 8 pin psi-e is missing
Connected to the graphics card power 6 pin psi-e and hooked the monitor is 1920x1080. Start, gives a maximum resolution in 1600х400, all lag, the cooler of the card does not want to work, she heated. Removed the card, the monitor to the motherboard (integrated intel hd graphics 4000) works as usual, his resolution.
The map supply is not enough or the iron does not pull?