iceZ_Evolution :
Thank you guys
So the sweet spot for my build is 750W right ? and if I decide to do SLI later is 750W still ok ? or just get 850W for safety ?
in my country EVGA is not available.
but Corsair is kinda famous so I can find every series for Corsair.
for Seasonic is available quite a few series, can you recommend the series so I can check if it available in my country ?
(I just realize Seasonic is a legendary brand but I just never heard it before until few days ago)
I checked at QVL for Formula from ASUS the other day, should I care about qualify PSU ?
in QVL shows RM850X is qualify, can't find RM750 in my country anymore.
So the easy choice maybe choose between RM850X or HX850/750i and maybe Seasonic if I can find it
here what I can find so far from Seasonic
Seasonic Platinum 860W
Seasonic PRIME 650 W Titanium
Seasonic PRIME 750 W Titanium
Seasonic X SERIES 850 W
As far as rig built around a single GTX 1080 (not 1080Ti) is concerned, the recommended PSU wattage is 520W; for a rig built around a GTX 1080 SLI (not 1080Ti SLI), the recommended PSU wattage is 750W. Here is one of the most oftenly-linked reference for your PSU Requirements by RealHardTechX:
http://www.realhardtechx.com/index_archivos/Page362.htm . To this date, we still do not know the power consumption of the future GTX 1080Ti, so we can only speculate that a 550W-ish or a 750W-ish PSU **might** be the suggested wattage for a single or SLI setup, respectively. We can only know for sure once the actual card has been released, benchmarked, and reviewed.
I am sure you have come across the PSU Tier List:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html . Seasonic has almost all PSU series in the upper tiers (FL, XP, P, X, G) and some slightly falling between mid-upper tiers (M12II, S12II). Corsair, on the other hand, has some selected PSU series in the upper tiers (AXi, AX, RMi, RMx, HXi), a handful of models at the middle tiers (HX, some RM, TX, VX) and several models at the lower tiers (CS, CX, CX-M, VS, GS, most RM).
Personally, I would not recommend you getting the 80+ Platinum nor the 80+ Titanium rated models as they are ridiculously overpriced for the same performance you only need (not want). Some reviews have already pointed out that these 80+ ratings are highly subjective and just a reason to bring the price of the units up. Take a quick read on this 2017 article "
Is 80 PLUS Broken? How To Make It A More Trustworthy Certification" (by Tomshardware):
http://www.tomshardware.com/reviews/80-plus-psu-efficiency,4848.html as well as this 2011 article "
Why 80 PLUS® is Irrelevant to You When Buying a PSU" (by HardOCP): http://www.hardocp.com/article/2011/10/04/80_plus_irrelevant_to_you_when_buying_psu/ .
The above sample graphs shows you that when your PC is run at 24/7 at a 50% load (which is a typical average scenario), the cost to operate a Platinum-rated PSU is at ~$0.52/day. This is just ~$0.01/day less than a Gold-rated PSU and just a ~$0.04/day less than a Bronze-rated PSU. This simple graph shows you that the time to recuperate the cost for an expensive Platinum-rated PSU will be longer than recuperating the cost you spent for a Gold-rated PSU providing almost the same amount of efficiency. So, price/performance, I would not recommend overpaying for something you can't fully utilize where a much lesser price is available. I highly suggest you eliminate the "need" (i.e., want) of a Platinum or Titanium-rated PSU, get a Gold or Bronze-rated PSU for the same performance, and save your hard-earned money to purchase the much-needed upgrade of other components in your PC.
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