PSU requirements for a GTX 970???

[ryucamua]

Do I need to upgrade my PSU for a GTX 970? If so, how many watts and what kind of PSU do I need to power them all up? I researched and I saw that the GTX 970 uses 5 Watts more than the GTX 660 (140>145W), but it states that minimum power requirements for GTX 970 is 500W meanwhile 660 has a 450W minimum requirement.
My rig:
CPU: i7 4820K STOCK CLOCK Might perma OC to 4.5GHz soon, I'll most likely use ASUS optional mode option instead)
FAN: Stock Intel cooler with blue LED lights (Getting a H100i cooler soon for a cooler CPU)
GPU: GTX 660 (non-ti) TF edition factory OC
RAM: 4x4GB Ram Sticks ADATA DDR3 PC3-12800 = 16GB RAM
MOBO: ASUS P9X79LE
Fans: 3 stock casing fans with red LEDs
Drives: 1 SAMSUNG 850 EVO SSD 120GB + 2TB WD Black edition HDD
PSU: ATNG 600W power supply 80PLUS certified PSU (Got this in December 2013 as a new PSU from a friend's computer when he upgraded his CPU) My computer has been running since DEC 2013 very well with this PSU)
OC Notes: I had used ASUS Optimal mode once (Auto 4.5GHz OC), when I turn on the PC the computer suddenly shuts down but when I turn it on again it powers up normally with the Asus optimal mode on, I don't think this is really an issue because I had ran this computer for a month with the OC on with no power issues while gaming.)

 

[Ubrales]

The GTX 970 requires a minimum 500 watts PSU (good brand) system power.

Pick Tier 1 or Tier 2 - http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

 

[Archaic59]

It's an OEM type PSU and does not belong in a high end Intel system that may be overclocked.
One of these would be appropriate:

http://pcpartpicker.com/parts/compare/antec-power-supply-hcg520m%2Cseasonic-power-supply-m12ii520bronze%2Cxfx-power-supply-xfxts550w/

For a little more headroom one of these would be good:

http://pcpartpicker.com/parts/compare/antec-power-supply-hcg620m%2Cseasonic-power-supply-s12ii620bronze%2Cxfx-power-supply-p1650gts3x/

 

[Alex R]

I'd suggest something like an XFX TS 550w PSU. I have one and my i5 OC and GTX 970 OC run great. It's a Tier 2 PSU

 

[Ubrales]

Yes, the XFX 550 watts PSU is a great PSU and will meet all the new requirements.

 

[ryucamua]

It's an OEM type PSU and does not belong in a high end Intel system that may be overclocked.
One of these would be appropriate:

http://pcpartpicker.com/parts/compare/antec-power-supply-hcg520m%2Cseasonic-power-supply-m12ii520bronze%2Cxfx-power-supply-xfxts550w/

For a little more headroom one of these would be good:

http://pcpartpicker.com/parts/compare/antec-power-supply-hcg620m%2Cseasonic-power-supply-s12ii620bronze%2Cxfx-power-supply-p1650gts3x/

Thx, I would look forward to the kind of PSUs you recommend.
I mostly looked over the modular Antec power supply you provided however Newegg had a new version of the power supply. (I think because of its new look) (Antec HCG M HCG-750M 750W ATX12V SLI Ready CrossFire Certified 80 PLUS BRONZE Certified Modular Active PFC Power Supply) and I wonder if this is compatible with my system even the room is bigger than the 620W version you recommended.
Link: http://www.newegg.com/Product/Product.aspx?Item=N82E16817371059&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=