Need advice on GPU

[Chebi]

Hi there, I want to upgrade the graphics card on my computer for gaming. I have a Dell Studio XPS 9000/435 with a i7 920 and 8gb of ram, my currently GPU is a GeForce GT 220. I was told that the Nvidia GeForce GTX 750 ti was compatible with my PC so I decided to buy one. Now my questions are:
Should I get the Gigabyte's one or the NVGA's?
The gigabyte requires a pin connector for extra power supply, do you know if my pc has it?
And finally, what else do I need to have to stream media (e.g movies) in 4k with these cards?
Thank you!

 

[Ahmadjon]

You should check your PSU for PCI-E supply cables

 

[IDontUnderstand]

Go with whichever that fits your PSU, there are ones without PCI-E connectors.
Gotta check your PSU
Nothing else other than this GPU and a video cable

GTX 750 Ti (100% Compatibility, unless your PSU is like 200W or something...)
http://www.ncixus.com/products/?usaffiliateid=1000031504&sku=94331&vpn=02G-P4-3751-KR&manufacture=eVGA

Source that it doesn't require 6 pin
http://www.evga.com/products/Product.aspx?pn=02G-P4-3751-KR

 

[ikaz]

Also for 4K media you need monitor/TV that can support that resolution. A 4k Monitor will probably cost you 1-2K+ you could buy a cheap 4k TV for like $500 but its only 4K@30fps and I heard its really only good for having large desktop for things like programing etc.