Can i upgrade without changing the PSU?

I am currently running a system with a 650 and wish to change to a 970 althogh i dont know if i will need to upgrade my 650watt power suply. My full system specs are bellow any help would be good althogh i would like to not push my power suply to far if it is fine to keep it.

Hardwair
Intel Core i7 3770K Processor 3.50 GHz
Corsair Hydro Series H55 Liquid Cooler
Asus P8Z77-V LX Motherboard
16GB Corsair PC3-12800 1600MHz DDR3 Memory

Disk drives...
250GB Samsung 840 EVO Solid State Drive
3X Seagate 500GB 7200RPM Hard Disk - 6Gbps
24x SATA DVD+/-RW Drive
NZXT Sentry Mesh Fan-Controller

The card and PSU...
Corsair Ultra Low Noise 600W PSU, Windows 8.1 Pro 64 bit
NVIDIA GeForce GTX 650 1024MB Graphics Card

should be fine. just no overclocking

You should be Okay. Here is a place where you can check. This is a fairly basic question.
Google it.
http://powersupplycalculator.net/

I'm pretty sure you can but to be totally sure about it check how much amperage the 970 requires and than how much amperage your power supply is able to output on the 12V. If the value of the videocard is below the one defined by the spec of your power supply the upgrade is safe. To be honest I think you could do it blindly without even thinking about it but is better to be sure. Have fun!

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Yes, it will be fine. More than fine.
That's a CX600 and it does 46A on the 12V rail while GTX 970's off the top of my head do like 200-250W under gaming load or in other words ~17-21A.

It's not of the highest quality power supply but it will work just fine.

According to BeQuiets PSU-Calc you are fine. I did the calulations with an i7-3820 because I could not find the 3770k.
You just cant add a second GPU.

thanks all of you, also i ment to replce it not add onother @CrossCarbon

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Misread, sorry.

Until recently I was running an i5-3570k at 4.4 and an overclocked Gigabyte 970 on a 550W Seasonic with no problems. You'll be fine.

Perfectly fine it was a good point that should be made in ether case and more than likely due to my poor grammar.

Yes. I tested this when i had a 970. A pc with an i7 and a gtx 970 and average components will use under 300w.

That's not correct.

You will be fine. You can run two 970's easy on that PSU. Enjoy

Yea, I stand corrected, it's actually between 150-200W under gaming load.