750 or 850W PSU for this build?

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pm4

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Apr 28, 2014
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Hello

I'm trying to determine if my build need 750 or 850W PSU.
PSU in question are Seasonic X 750W/P 760W vs Seasonic X 850W/P 860W

Setup:
i7-4790k (when it's released)
sapphire r9 290 vapor-x
asus z97 sabertooth mark 1
2x ssd
1x hdd
1x ODD
3x Noctua chassis fan connected to motherboard
1x CPU cooler NH-D15 (2 fans NF-A15, connected to motherboard)

Now some extra info:
1. Seasonic have 7y warranty on those PSU and I plan to use it, so PSU should be able to power it for all that time and more.
2. Single GPU only, no crossfire.
3. Possible OC of GPU and CPU

So if i want to run this setup for 5+ years will 750W be able to do it even with OC or do I need 850W?
Also can you consider r9 290x vapor-x instead or r9 290 too?
Considering 50% load as top efficiency which one would be better if both can power it?
And lastly P or X serie? Difference in price is about 22 euro for smaller and 12 euro for bigger versions.

Thank you for answers.
 
Solution
nikoli707
my about 2.5 year old tier 3 ocz modxstream pro 600w is working fine for my 2500k@4.5ghz and my classy 780@1.3ghz running stock level 1.212v. its likely to continue to work fine. a 4790k@4.5ghz will consume noticeably less wattage under full load while offering considerably better overall power consumption due to its more mature power saving features.

ive ran done a couple quick benchies running my 2500k@4.7ghz at roughly 1.40v load on the core and my classy 780@1375mhz running 1.2875v on the core with no problems.

that 660w platinum seasonic is a tier 1 dream of a power supply and will work more than fine. capacitor aging on that unit will be vastly lower than what you would find on tier 2 or 3 units since they are the highest...
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emdea22

emdea22

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Oct 25, 2011
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Both are overkill considering they're Seasonic. A seasonic s12II 520 will be enough to power your pc even with OC. That said if you want to choose between those two, get the 750 one. It was way more power than you'll ever need. Even if you plan to Xfire...
 
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nikoli707

nikoli707

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Jan 4, 2012
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you could get by with a 650w power supply including overclocking and have plenty of headroom. that said, since the difference in price for highly reviewed quality gold rated fully modular power supplys in the 650-750 range isn't that much, i would just get the xfx pro 750w(seasonic made).

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX ProSeries 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($94.99 @ NCIX US)
Total: $94.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-18 16:53 EDT-0400)

but if you want that extreme warranty and probably hands down one of the best power supply ever made.... look no further than the seasonic platinum ss series. it would world flawlessly for even a 3960x@5.0ghz and a 780ti@1.5ghz.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: SeaSonic 660W 80+ Platinum Certified Fully-Modular ATX Power Supply ($138.99 @ SuperBiiz)
Total: $138.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-18 16:56 EDT-0400)
 
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P

pm4

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Apr 28, 2014
421
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So 750 W is overkill too :)?
I know that suggested PSU for GPU have big safe margin.

So 660W platinum from seasonic should be able to run it with OC on cpu and gpu (even if i use r9 290x vapor-x which can have around 250W power drain at load with spikes to 350W) for those 5+ years?

I tried to use some of those PSU calculators, but from how it looks they calculate it as if i would use all devices at same time to 90-100%. And all that capacitator aging at some calculators just makes it more messy so I got confused how much power will that build actually need.

Local stores do not have XFX and delivery + tax would make it lot more expensive :). So I'll stick with seasonic X or P

So my options are (prices in euro)
X 650 - 123,82
P 660 - 138,55
X 750 - 142,12
P 760 - 165,73
[strike]X 850 - 173,23
P 860 - 185,47[/strike]
 
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nikoli707

nikoli707

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Jan 4, 2012
6,008
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my about 2.5 year old tier 3 ocz modxstream pro 600w is working fine for my 2500k@4.5ghz and my classy 780@1.3ghz running stock level 1.212v. its likely to continue to work fine. a 4790k@4.5ghz will consume noticeably less wattage under full load while offering considerably better overall power consumption due to its more mature power saving features.

ive ran done a couple quick benchies running my 2500k@4.7ghz at roughly 1.40v load on the core and my classy 780@1375mhz running 1.2875v on the core with no problems.

that 660w platinum seasonic is a tier 1 dream of a power supply and will work more than fine. capacitor aging on that unit will be vastly lower than what you would find on tier 2 or 3 units since they are the highest possible quality. and again wattage wise it is more than enough for overclocking a 4790k and a 290.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: SeaSonic 660W 80+ Platinum Certified Fully-Modular ATX Power Supply (£112.39 @ Scan.co.uk)
Total: £112.39
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-18 22:21 BST+0100)
 
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Solution
P

pm4

Honorable
Apr 28, 2014
421
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Ok thank you will take one of those lower. Either 650X or 660P or maybe 750X depending on prices and what they will have at stock at moment I ll be buying my PC, as they don't have big supplies so they might not have 650/660 (right now they have them sold out but I plan to buy it in next 2 weeks so hopefully it will be restocked).

Selected nikoli707's answer as solution, but thank you also emdea22.
 
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