Well i just bought a new video card (asus 750Ti) but I didn't check the pins in my current power supplier. So I can't plug the video card to the power supply since the plugs are different.
The video card:
Is there any adapter I can use or should I buy a new Power supply?
There is no question that you need to get a better power supply. Don't bother trying to get a molex to 6-pin adapter, they aren't trustworthy and using your current PSU in a manner it wasn't intended to support will only lead to a disaster.
You don't need anything fancy to power that card, here is a perfectly fine PSU for what you need (including having the proper 6-pin connection):
What connector sockets does your PSU have? Do you know which model it is? You need a 6 pin pcie power cable. None of those in the photo are the right one.
There is no question that you need to get a better power supply. Don't bother trying to get a molex to 6-pin adapter, they aren't trustworthy and using your current PSU in a manner it wasn't intended to support will only lead to a disaster.
You don't need anything fancy to power that card, here is a perfectly fine PSU for what you need (including having the proper 6-pin connection):
You purchased one of the few 750ti's that need PCIE power , MOST ARE POWERED FROM THE SLOT ONLY , you can get a new power supply or return the card for one that doesn't need an additional PCIE power.