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Started by Hanz_007 | | 10 answers
Problems with PSU Calculators
I am Building a New Gaming desktop

My configuration is as fellows :

Processor : Intel Core I5 4690K 3.90 GHz CPU Processor

Motherboard : ASUS Z97 MAXIMUS VII HERO Motherboard

Graphic Card : SAPPHIRE DUAL-X R9 280 3GB GDDR5 OC BOOST Graphic Card

RAM : Gskill Trident X F3-2400C10D-8GTX RAM

Two LED Fans 140mm& 120mm
Two 120mm fans
One 140mm Fan

USB Keyboard & Mouse

HARD DISK : One Seagate Desktop SSHD ST1000DX001 1TB

One SSD 1TB Seagate hard disk

DVD ROM/RW

should I get a

1) CORSAIR HX Series HX850 Power Supply — 850 Watt 80 PLUS® Gold Certified Modular PSU

or

2) CORSAIR TX Series™ TX750 — 80 PLUS® Bronze Certified 750 Watt High Performance Power Supply

Please advice as what power supply should I get as some Calculator says

Asus Calculator says 750watts

eXtreme Power Supply Calculator Lite says 430W to 480W

Cooler Master says 475Watts

Cooler Master power calculator Advance says 500Watts
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a c 298 4 Gaming
a c 723 ) Power supply
a c 1189 V Motherboard
a c 1432 U Graphics card
October 14, 2014 3:43:20 PM

^+1 Anand shows that the total system power consumption with a 280X under load is just under 400watts. So 550watts is plenty.
a b 4 Gaming
a c 1218 ) Power supply
a c 224 V Motherboard
a c 578 U Graphics card
October 14, 2014 3:06:27 PM

Hanz_007 said:
The SAPPHIRE DUAL-X R9 280X 3GB GDDR5 OC (UEFI) Card Specifications specifies
 750 Watt Power Supply is required.
 1000WattPower Supply is recommended for CrossFireX™ System.
 1X150 Watt 8-pin PCI Express power connector is required.
 2X150 Watt 8-pin PCI Express power connector is required for CrossFireX™ system.
Link : http://www.sapphiretech.com/presentation/product/produc...
Would 500W be really enough ?
Thanks


You missed the 6-pin PCIe power connectors:

2X75 Watt 6-pin PCI Express power connector is required for CrossFireX™ system.
1X75 Watt 6-pin PCI Express power connector is required.

A single card has one 6-pin & one 8-pin PCI-Express power connectors. That equates to a theoretical maximum allowed power draw for a single graphics card of 300 Watts.
a b V Motherboard
October 14, 2014 2:46:40 PM

A quality 550 watt PSU would do get another 100 watts if you wish for more breathing room.
I run a high overclock on my i5 2500K with 2 power hungry overclocked 6970 video cards on a Corsair TX 850 V2
As I stated above that video card only uses 200 Watts of power running 100% In the specks they are always going to recommend more power that in needed because they have no clue what the rest of the PC you have has in it or if your going to buy a overrated piece of crap power supply.
October 14, 2014 2:28:35 PM

The SAPPHIRE DUAL-X R9 280X 3GB GDDR5 OC (UEFI) Card Specifications specifies
 750 Watt Power Supply is required.
 1000WattPower Supply is recommended for CrossFireX™ System.
 1X150 Watt 8-pin PCI Express power connector is required.
 2X150 Watt 8-pin PCI Express power connector is required for CrossFireX™ system.
Link : http://www.sapphiretech.com/presentation/product/produc...
Would 500W be really enough ?
Thanks
October 14, 2014 2:25:12 PM

rolli59 said:
The calculators are right since that will be the actual total system load. If you are staying with a single card a quality 550watt+ will handle it but if planning dual then I would go with HX or similar.


Traciatim said:
I agree with the others. For my own machine which is a slightly OC'd 3570k with a GTX670 I've measured it with a Watt's Up Pro watt meter and it pulls about 300 watts from the wall when running full tilt, meaning since my power supply is 90% efficient or so... that's 270 watts actually being supplied to the PC components. Yours would be pretty similar, so if you were looking at pulling 300 watts and you want to run at 60% of your capacity then you'd be shooting for a 500 watt supply or so.



The SAPPHIRE DUAL-X R9 280X 3GB GDDR5 OC (UEFI) Card Specifications specifies
 750 Watt Power Supply is required.
 1000WattPower Supply is recommended for CrossFireX™ System.
 1X150 Watt 8-pin PCI Express power connector is required.
 2X150 Watt 8-pin PCI Express power connector is required for CrossFireX™ system.
Link : http://www.sapphiretech.com/presentation/product/produc...

Would 500W really be enough ?
Thanks
a b V Motherboard
October 14, 2014 7:24:24 AM

All calculators are wrong but the closest is eXtreme Power Supply Calculator.
Watts up and kill-a- watt meters are also wrong they cant change fast enough to catch spikes.
R9 280 200 Watts processor 85 watts, rest of the PC 100 watts.
Full system stress test about 385 watts. Buying a 550 watt power supply would run it at about 70%
Real world watts used would be more like 300 watts.
a b 4 Gaming
a b ) Power supply
a b V Motherboard
a b U Graphics card
October 14, 2014 7:08:24 AM

I agree with the others. For my own machine which is a slightly OC'd 3570k with a GTX670 I've measured it with a Watt's Up Pro watt meter and it pulls about 300 watts from the wall when running full tilt, meaning since my power supply is 90% efficient or so... that's 270 watts actually being supplied to the PC components. Yours would be pretty similar, so if you were looking at pulling 300 watts and you want to run at 60% of your capacity then you'd be shooting for a 500 watt supply or so.

October 14, 2014 5:44:18 AM

PSU calculators aren't that accurate. You only need a 650-700 watt with high efficiency rating where I also considered that you will be overclocking your 4690k.

I hope this posts helps :) 
a c 298 4 Gaming
a c 723 ) Power supply
a c 1189 V Motherboard
a c 1432 U Graphics card
October 14, 2014 5:23:31 AM

The calculators are right since that will be the actual total system load. If you are staying with a single card a quality 550watt+ will handle it but if planning dual then I would go with HX or similar.

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