Hi so i ordered a GTX 570 for my pc and a 600w Power supply to run it now im just wondering if ill be able to fit these in my current case or if ill have to invest in a new one The computer i am using is a prebuilt HP p7-1234
the card is: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130699&nm_mc=TEMC-RMA-Approvel&cm_mmc=TEMC-RMA-Approvel-_-Content-_-text-_-
and the power supply is:http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017&nm_mc=TEMC-RMA-Approvel&cm_mmc=TEMC-RMA-Approvel-_-Content-_-text-_-
Also if anyone can help with the issue of my benQ xl2420t not being able to output 120hz at 1080p although i am using the DVI cable it would be greatly appreciated
the card is: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130699&nm_mc=TEMC-RMA-Approvel&cm_mmc=TEMC-RMA-Approvel-_-Content-_-text-_-
and the power supply is:http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017&nm_mc=TEMC-RMA-Approvel&cm_mmc=TEMC-RMA-Approvel-_-Content-_-text-_-
Also if anyone can help with the issue of my benQ xl2420t not being able to output 120hz at 1080p although i am using the DVI cable it would be greatly appreciated

Just remember to use the Dual link DVI cord if you don't have one you'll need to get one its the one with all the pins.