Which PSU is best for this system?

ubermik

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I had been planning to have a go at building my first gaming PC and after purchasing a golden flower green HX 80+ gold 550w PSU and a GTX 950 xtreme GPU I saw a PC with the following specs which I managed to get for £550 with all the boxes and receipts (all bought together 3 months ago)

Specs are as followed

Intel i5 6600k (skylake)
Asus z170 pro gaming motherboard
16gb kingston hyper x ddr4 ram 2400mhz
Corsair h55 liquid cpu cooler
120 gb kingston ssd
1tb western digital hdd
Corsair 650 psu
Msi gtx970

Also comes with

Logitec g303 mouse
Corsair m300 extended mouse pad
Trust keyboard
Spare gaming mouse
And a logitec c270 webcam

I wont be using SLI so the only changes I am likely to make to this is replacing the 1tb hard drive with 2x 3tb Toshibas and replacing the 120gb HDD with either a 256GB Toshiba sata or a 120/128gb M2 drive

My question is this, would the golden flower gold PSU be sufficient to power this system and still leave a healthy amount of headroom primarily

And secondly is the golden flower HX gold a better PSU than the corsair CX650?

I may try the 950 xtreme card in there as the 970 might be excessive for just playing world of tanks and command and conquer lol, but I was amazed to find out that theres hardly any difference in power consumption between the 950 and 970 for some reason (140 vs 145 watts) which didn't seem to make ANY sense whatsoever.

But for the purpose of the question just assume I am leaving the 970 in the machine

I did try to find this out for myself but reviews and views seem to completely contradict each other and some reviewers love and hate both PSUs leaving me more confused than before I started so I thought I would try and get some real world opinions rather than reviewers who "might" be biased due to free product deals from one company or the other to review them

Also if its ok to tack on another question, I am completely new to M2 drives having never had a machine that supports them before. So any recommendations on a drive that will match well with that motherboard without requiring me to sell a kidney would be appreciated ideally I guess the x4 pcie type unless theyre ridiculously expensive but just one large enough for the OS and a 20gb partition for the swap file to reduce fragmentation

Cheers
 

ubermik

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Its the CX 650 that came in the case, I had bought the super flower when the plan was to build it myself. So I was wondering if it made sense to replace the CX650 bronze with the superflower 550 gold
 

ubermik

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That's awesome then guys thank you

I have been looking at the power consumption of the 950 and 970 after posting the question and tbh I really don't think its worth me keeping the 970 for he type of gaming I will be doing (world of tanks, command and conquer and maybe elite dangerous)

So that instantly removes as much as 70 watts from the drain anyway as the claims that the 970 ONLY needs 145 watts seem to be a massive fib, and actual reviews have shown the card taking over 200 watts during game play

I thought it sounded too good to be true that it only took 5 watts more than the 950 xtreme

Manufacturers telling porkies whatever next lol :)
 

ubermik

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yeah that's why I was wary

In the same way I wouldn't want to drive my car at 90% of its top speed everywhere I went I have never been keen on running a PSU at around 90% of its maximum output either and prefer a decent bit of headroom

So the 970 and 550 PSU felt like it might be cutting it a bit too close for the PSU living a long and healthy life whereas the 950 leaves much more headroom on the smaller PSU

If I do keep the 970 though I will probably buy myself a 650 or larger gold rated PSU from golden flower or seasonic and replace the corsair CX model
 

ubermik

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Ok cheers that's good to know. I have a power meter for my UT71E so I'll hang off on deciding until I have the system how I want it and then check what sort of power I am drawing under load. Ideally I wouldn't want to run the PSU much above 75% of the maximum rated output

Does not using the HD graphics in the CPU take much off the rated TDP?