upgrading psu & gpu for k450e desktop with no experience

[Philexan]

Howdy, I'm interested in upgrading my power supply and graphics for my Lenovo K450e desktop, it's my first time installing hardware by myself and not sure how to go about it. I am thinking of using the following power supply and graphics card to upgrade to.

http://www.amazon.com/EVGA-GeForce-256bit-Graphics-04G-P4-3975-KR/dp/B00R3NK2LE/ref=sr_1_1?ie=UTF8&q...

http://www.amazon.com/EVGA-Continuous-Warranty-Supply-100-W1-0500-KR/dp/B00H33SFJU/ref=sr_1_1?ie=UTF...

My system specs:
• 4th Generation Intel Core i7-4790 Processor (3.60GHz 1600MHz 8MB) • Windows 8.1 64 • Intel® HD Graphics 4600 • 16.0GB PC3-12800 DDR3 SDRAM 1600 MHz • 2TB 7200 RPM + 8GB SSHD • DVD Recordable • Broadcom 802.11b/g/n Wi-Fi wireless • One year • Optical ScrollPoint

I would like to know if this set up would work/fit inside the case and any other tips you guys might have. Thanks for the help, I appreciate it.

 

[Lutfij]

1| Please follow this article as a reference for power requirements.
2| Pick this PSU up by EVGA to help give you headroom in terms of longevity and retention should you want to swap the PSU and GPU onto a more powerful and overclocking worthy system.
3| You're sure you don't have the i7-4790K processor, right?
4| Pick the same GPU from another vendor to get some more off your investment.