What is the best bang for buck low power consumption GPU?

[seakay]

Hello,
Looking for a best overall value preferably for under $150, low power consumption GPU so I don't have to upgrade my PSU. Any suggestions?

 

[ThatVietGuy]

GTX 750ti

 

[AznGOD]

a gtx 750ti For around 300watt psu
a r9 270 for around 400 watt psu

 

[cdabc123]

gtx 750ti its a great gpu and its not that expensive ether. I run one and it is amazing.

 

[seakay]

I have a factory build XPS 420. Not sure what the PSU is, how do I find out?

 

[ThatVietGuy]

You have at minimum 375W which is good enough for the GTX 750ti - http://www.dell.com/content/products/productdetails.aspx/xpsdt_420

Otherwise, look on the PSU itself for a sticker/label that will tell you how many watts it puts out.