If this is an oem pc you best make sure the 2700k is on the support list.I5 2500T STOCK COOLER
8gb RAM DDR3 DUAL CHANNEL
GTX 960 2gb Zotac edition
PSU OF 420
I want to upgrade to i7 2700K is my PSU enough or do i need to upgrade (BY HOW MUCH )
I don't have enough knowledge of overclocking so i will not overclock i will take a look at my psu to see its qualityYour 2500T is a processor with a 45w TDP.
The 2700K is a 65w tdp processor.
I doubt that the difference will be a problem unless you can and will overclock.
Most of your power draw will be from the GTX960 graphics card which is not changing.
If your psu is old or of cheap quality, you may want to consider a replacement, regardless.
You can upgrade to the i7 2700K
IT is a Thermal master ATX12V product no is TM-420-PSAR-M3model of this 420w psu?