Huge PSU vs "Big Enough" PSU

[Renato2005]

Hi Guys,

I'm building a new PC and got on the PSU step right now.

Using the PSU Calculator, it tells me that my system will be using 760w and recommends me to buy a 850w psu.

Looking in the online shops, i've choosen the corsair rm850x, it has a ok price for me and it will deliver enough power, on the other hand, I saw that the evga 1200 p2 is like 15% expensivier.

I've seen the PSU tier list, and know that this corsair is a tier 2 gold and the evga is tier 1 platinum, but is it worth this 15% more? and is there any good use a such big psu since i'll "never" be using it's total power?

Thanks!

PS.: I've seen that rm850i is tier 1 and better.... but I can't find any local shops with it on stock right now.

 

[Zerk2012]

You might need to list your parts 750 Watts from the parts total seams really high unless your running some bad selected parts or 3 video cards.

 

[Renato2005]

You might need to list your parts 750 Watts from the parts total seams really high unless your running some bad selected parts or 3 video cards.

Aw sorry,

I'm not going to lie, I've kinda overestimated my needs in order to do not have to surprises in the future, but basically:

i7 6700k @ 4.8Ghz
4x8gb ddr4 rams
1 sata 7200 rpms hd
1 ssd
1 m.2 ssd
2 gtx1080
...and some other stuff like led strips, a 240mm WC, etc

Look, I dont own these stuff yet, this is a long upgrade/build plan. xD and that's one of the reasons i'm was choosing one 850w psu.

 

[photonboy]

1) 4.8GHz may not be possible. Frankly I wouldn't push it that high even if I could.

About 200W for base system at 4.6GHz though: http://www.corsair.com/en/blog/2015/august/overclocking_i7-6700k

2) 225W is probably the max for each GTX1080 (ignore most of the little, thin spikes):
http://www.tomshardware.com/reviews/nvidia-geforce-gtx-1080-pascal,4572-10.html

3) 200+ 225 + 225 = 650W

(plus some other stuff, but the CPU at 100% and both GPU's stressed fully isn't going to happen much, if ever)

So...
At least 850W.

A quality 850W is likely just fine. Like an EVGA G2 or similar.

*Make sure your power supply has the proper connectors. Some of the GTX1080's have ridiculous PCIe connections. I know one has an 8-pin and a 6-pin, and some may have more than that... (whether it needs the power or not).

 

[photonboy]

http://pcpartpicker.com/product/dJ6BD3/evga-power-supply-220p21000xr

The EVGA 1000W P2 is my top choice. Good review:
https://www.techpowerup.com/reviews/EVGA/SuperNOVA_P2_1000/11.html

It has a TEN YEAR WARRANTY.

*PCIe connectors:
6x (6-pin +2-pin), and
2x 6-pin

**Finally, it has an ECO MODE switch to disable the fan below a certain wattage (and temp?).

Summary:
Based on the total COST of your entire build, I'm not sure I would fret too much about a bit more money on the power supply, but if budget really is that tight then maybe THIS one instead:
http://pcpartpicker.com/product/LCfp99/evga-power-supply-220g20850xr

 

[Renato2005]

1) 4.8GHz may not be possible. Frankly I wouldn't push it that high even if I could.

About 200W for base system at 4.6GHz though: http://www.corsair.com/en/blog/2015/august/overclocking_i7-6700k

2) 225W is probably the max for each GTX1080 (ignore most of the little, thin spikes):
http://www.tomshardware.com/reviews/nvidia-geforce-gtx-1080-pascal,4572-10.html

3) 200+ 225 + 225 = 650W

(plus some other stuff, but the CPU at 100% and both GPU's stressed fully isn't going to happen much, if ever)

So...
At least 850W.

A quality 850W is likely just fine. Like an EVGA G2 or similar.

*Make sure your power supply has the proper connectors. Some of the GTX1080's have ridiculous PCIe connections. I know one has an 8-pin and a 6-pin, and some may have more than that... (whether it needs the power or not).

http://pcpartpicker.com/product/dJ6BD3/evga-power-supply-220p21000xr

The EVGA 1000W P2 is my top choice. Good review:
https://www.techpowerup.com/reviews/EVGA/SuperNOVA_P2_1000/11.html

It has a TEN YEAR WARRANTY.

*PCIe connectors:
6x (6-pin +2-pin), and
2x 6-pin

**Finally, it has an ECO MODE switch to disable the fan below a certain wattage (and temp?).

Summary:
Based on the total COST of your entire build, I'm not sure I would fret too much about a bit more money on the power supply, but if budget really is that tight then maybe THIS one instead:
http://pcpartpicker.com/product/LCfp99/evga-power-supply-220g20850xr

So, due to the impossibility of buying your suggestion (not available im my country) it's a go to the evga 1200w p2?

 

[Dark Lord of Tech]

Look for an RMX , get one if it's available.

PCPartPicker part list / Price breakdown by merchant

Power Supply: Corsair RMx 1000W 80+ Gold Certified Fully-Modular ATX Power Supply ($149.99 @ Newegg)
Total: $149.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-19 15:16 EDT-0400

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=449
Perfect 10​

 

[Dark Lord of Tech]

RMX 1000w
http://www.terabyteshop.com.br/produto/5962/fonte-corsair-rmx-series-rm1000x-1000w-reais-80-plus-gold-atxeps-pfc-ativo-cabos-modulares​

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=449
Perfect 10​

 

[Renato2005]

RMX 1000w
http://www.terabyteshop.com.br/produto/5962/fonte-corsair-rmx-series-rm1000x-1000w-reais-80-plus-gold-atxeps-pfc-ativo-cabos-modulares​

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=449
Perfect 10​

Ha! Funny you sending me a link from the shop I was looking into. XD
So, RM1000X and no worries about evga or the rmi model?

 

[Dark Lord of Tech]

I love EVGA too , RMX and RMI are first rate , I have the RMX 850W , STELLAR PSU.​