do I really need 1000W for my system - Overclock.net - An Overclocking Community

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do I really need 1000W for my system

 
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post #1 of 8 (permalink) Old 07-23-2017, 09:14 AM - Thread Starter
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looking to replace my old noisy 1000w psu
should I buy a 850w or 1000w psu

5930k @ 4.5
2 x gtx 1070 overclocked
Swiftech H220X
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1 asus stx
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post #2 of 8 (permalink) Old 07-23-2017, 10:12 AM
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As little as a 650 watt PSU would be enough power for the system that you have
So no you dont need a 1000 watt PSU unless you have plans for 3 or 4 way SLI or for LN2/liquid helium cooling

Your old PSU by the way is terrible so it most definitely needs to be replaced
Only reason why it has not damaged anything in your system is because you have not loaded it high enough

Edit: i used to have a thread about the Coler Master Silent Pro Gold and why its so terrible
But someone got butthurt and had it deleted.

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post #3 of 8 (permalink) Old 07-23-2017, 10:40 AM - Thread Starter
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cooler master sent me that 1000w as a replacment for a 650w psu ... used it for years in diferent setups (5870cf 480 580sli 780sli) without problems until last year it became noisy

I think i am getting a 750w or 850w seasonic prime gold psu .. no coil whine reported yet for this model

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post #4 of 8 (permalink) Old 07-23-2017, 10:56 AM - Thread Starter
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seasonic prime gold 850w = 220 cad
seasonic prime gold 750w = 180 cad

terrible prices

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post #5 of 8 (permalink) Old 07-23-2017, 11:23 AM
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Using a few different PSU calculators, I get between 600-800W usage under full load with your cpu overclocked and 1070 boosting a decent amount. You can get by on a 650, 800, or 1000W PSU for sure, but quietly is a different story. Most quality PSU's can provide slightly more power than they are rated for, so you likely wouldn't see shutdowns on a 650 or 800W PSU, but that is not what I would recommend, especially if you plan to keep the unit for a long time and use in any future builds.

Look for a PSU that is silent or has an "eco mode" such as EVGA's platinum and titanium units, as well as corsairs AXi or HXi series. These units provide very good power, and the high end models are silent up until around 500W, or a specific temp to be exact, when the fan kicks in to around 1000 rpm. Pretty much every PSU on the market has a good review on it that includes metrics such as noise and temperature. They will tell you how the PSU in question will operate at a given load range. Having said that, I cannot find very good data indicating the Seasonic 850 Prime Gold will be as quiet as you want. It has a hybrid mode, but none of the reviews give a graph of load vs fan rpm, and fan rpm vs noise, so its hard to say if that psu will be as silent as you want. A higher efficiency psu will do better on this front

I am in the process of replacing my old EVGA 1300G2 right now for a 1600T2, since my G2 is becoming very (relatively) loud since I am watercooled. I hear it 24/7 over my case fans, and wanted to upgrade to something that is silent at idle and small loads. I believe it is worth the investment. You will hear your 1070's over most PSU's under a loads, so the decision to go bigger isn't as critical. When you start to watercool everything, all you have to hear is your rad fans and the psu, the so decision to get a high end PSU become's more critical.

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post #6 of 8 (permalink) Old 07-23-2017, 11:25 AM
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Also, a PSU imo is a particular pc component where "buy once, cry once" makes more sense. A good PSU will last several PC builds.

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post #7 of 8 (permalink) Old 07-23-2017, 12:04 PM - Thread Starter
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evga psus are overpriced, last year i could get an evga 1000w p2 for 200cad now it costs 320cad

I don't like corsair psus

I don't like x series from seasonic


it seems the prime series is my only choice

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post #8 of 8 (permalink) Old 07-23-2017, 12:08 PM
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PSU calculators are worthless as they always overstate numbers by at least 28%
https://www.overclock.net/t/1598887/why-all-online-psu-calculators-are-wrong-and-is-total-bogus

So any number you get from a calculators is flatout wrong
And the Seasonic Prime is a good option just dont get the titanium rated version as that one is way overpriced

If you want another option there is the Bitfenix Whisper
And again you dont need a 1000 watt PSU no matter what anyone or anything tells you.

Seravee
(30 items)
CPU
Intel Core I7 6850K
Motherboard
Gigabyte X99 Ultra Gaming
GPU
MSI RTX 2070 Super Gaming X Trio
RAM
Kingston HyperX DDR4 Savage 3000 MHz
Hard Drive
Samsung 840 Evo 500 GB
Hard Drive
Corsair Force MP510 1,92 TB
Hard Drive
Seagate Ironwolf Pro 14 TB
Hard Drive
Seagate Ironwolf 12 TB
Hard Drive
WD Ultrastar DC HC530 14 TB
Hard Drive
Seagate Ironwolf Pro 12 TB
Hard Drive
Seagate Ironwolf Pro 16 TB
Optical Drive
LG CH12NS30
Power Supply
Seasonic Prime Ultra Titanium 750 watt
Cooling
Noctua NH-D15S
Case
Phanteks Enthoo Luxe Tempered Glass
Operating System
Windows 7 Ultimate 64 bit
Operating System
Windows 10 Home 64 bit
Monitor
Asus PG279Q
Monitor
LG 55C8 OLED TV
Keyboard
Corsair Strafe RGB MK.2 with Cherry MX Silent
Mouse
Roccat Kone EMP
Mouse
HyperX Fury S XL
Audio
Sennheiser HD 598
Audio
Onkyo TX NR646
Audio
Dali Opticon Vokal
Audio
x2 Dali Opticon 2
Audio
x2 Dali Opticon 1
Audio
Dali E12 F Subwoofer
Audio
Sennheiser HD-599
Other
CableMod 30 CM Magnetic Red LED strip
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