520, 620 or 750W PSU?

[Blitz Blitz]

I'm thinking about new build, but PSU is really headache. I'm thinking about starter build pentium + entry/midrange gpu, but also i'm thinking aboud upgrade down the road i5, or i7, with k or not k cpu version, + single strong nvidia gpu. Don't think about oc'ing, but if pc comes weaker, or need few mhz for cpu, ram, gpu for better work/gaming performance also it's good idea to get stronger psu, but dont know what actually fits my requirements. Thinking about 1 or 2 tier psu. If for more acurate seasonic s12ii, or M12ii... Help me to choose right one... 😉

 

[raisonjohn]

The least wattage PSU you can get in the Seasonic S12II or M12II series that would be **more** than enough to take you in your journey from a pentium + entry gpu all the way up towards an i7 non-k or k + single gtx 1080 is the 520W model (the S12II-520 or the M12II-520 EVO).

Alternatively, you can also get the Seasonic G-550 (much higher quality than the S12II or M12II) for a good price today in newegg (at ~$60.00 after rebate). https://www.newegg.com/Product/Product.aspx?Item=N82E16817151119

 

[JackNaylorPE]

1. To determine your PSU size....here's one way to do this:

a) do a web search on "Guru3d [insert your card model here]"

b) For example w/ MSI 1070 gaming X:

http://www.guru3d.com/articles-pages/msi-geforce-gtx-1070-gaming-x-review,1.html
http://www.guru3d.com/articles_pages/msi_geforce_gtx_1070_gaming_x_review,8.html

c) use the drop down to find the page w/ power consumption

http://www.guru3d.com/articles_pages/msi_geforce_gtx_1070_gaming_x_review,8.html

d) Note the following:

they calculate the card's power draw at 186 watts and make the following recommendation

Here is Guru3D's power supply recommendation:

GeForce GTX 1070 / 1080 - On your average system the card requires you to have a 500 Watts power supply unit.
GeForce GTX 1070 / 1080 SLI - On your average system the cards require you to have a 750 Watts power supply unit.

If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina. And remeber, a PSU is the most efficient at 50% load. So if you use 400 Watts on average (SLI), the most energy friendly powersupply would be an 800 Watt model.

Please not that no one is making an 800 watt recommendation for THIS card. What they are saying is that if you use **on average** 400 watts.... with this card you will likely use 400 watts while gaming .... and the rest of the time 9web browsing and other uses) you will likely be drawing less than 100. Right now with everything OCd "bawlz to the wall" while typing this from an water cooled SLI system I'm at 120 watts. When gaming I'm pushing 800 watts

e) Then you will want to go to the overclocking page

http://www.guru3d.com/articles_pages/msi_geforce_gtx_1070_gaming_x_review,30.html

and see that in their test they slid the power thingie to ... oops bad example, i can't see it ... but I can tell you it goes to 126% which means add 25% if overclocking and you have 234 watts

f) as a check, we can go to TPU

http://www.guru3d.com/articles_pages/msi_geforce_gtx_1070_gaming_x_review,30.html

and they measured a real 193 watts which compares well with Guru3ds calculated 186

So, you could get by with a 520 watter .... id use 600 at least if OC'ing

2. As far as which one, I find tier lists unreliable because units are placed on the list often on the basis of a single review (say at 850 watts) ... and it stays there regardless if manufacturer switching OEMs or the 550 watt unit under review was made by a completely different OEM from the getgo. For me, the only trusted source is a review from the model in question, from a trusted site, or at least one from the same OEM Platform.

3. So until you choose those components selecting a PSU will be a guess at best....

7700k might draw 125 watts OC'd, but only 91 watts at stock ... XPP system, add 100 watts
1070 might draw 180 watts, 1080 225 watts ... or 275 watts OC'd, 1080 Ti ... 325 watts ?

So... with a 7600 and single 1070, a 520 is just fine ... 7700k, Id want the 620 / 650 ... M12 is the modular version of the S12

 

[Justiceinacan]

Remember, PSU's like S12II aren't haswell ready, they need some BIOS tinkering.