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Massive PSU wattage difference - R9 280x

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Sword147
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2015/05/05 14:14:42 (permalink)
Hey everyone,
 
I am purchasing an r9 280x and there seems to be some very large discrepancies between the size of the PSU I should purchase depending on the card manufacturer.
 
The XFX card requires a 750w PSU
 
The Asus card requires up to 300Wadditional 6+8 pin PCIe power required (which a 750W psu should be able to handle)
 
The HIS card requires at least a 500 w PSU
 
Why is there such a huge discrepancy between the power required for the card? I am leaning towards the highest end XFX GPU btw.
 
I currently only have a 600w PSU and want help purchasing a PSU.
 
What is the minimum wattage for the new PSU I should buy? (PC Specs Below)
 
Gigabyte GA-X58a-UD3R motherboard
Intel Xeon X5660 @ 3.8ghz (95w) 1.2v
12gb 6x2gb DDR3 RAM @ 1333mhz 1.5v
XFX R9 280x (requires 750w, recommends 850w)
1 Blu-Ray Drive
2 DVD-RW Drives
6 120MM Case Fans
1 HDD
1 Fan Controller
 
 
Thanks for all the help!
 

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    tucker147
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    Re: Massive PSU wattage difference - R9 280x 2015/05/05 14:21:31 (permalink)
    What psu do you have currently?
    600W should be more than enough if it's a quality psu, you may have some oc headroom too.



    The Banshee: Ryzen 5 5600 @ 4.65GHz 1.25V, CPU + 2X GPU Custom loop w/ 360mm & 240mm rads, Asrock X370 Taichi, 2X GTX 780 Ti SLI, EVGA 1300 G2, WD Blue 1TB (main storage), Corsair Force LS 120GB (OS Drive), Fractal Design Arc XL, 2X8GB G.skill Trident Z @ 3200 C14
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    Sword147
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    Re: Massive PSU wattage difference - R9 280x 2015/05/05 14:31:46 (permalink)
    I have an old Rosewill 600w PSU. I would have to upgrade the PSU regardless. Only has 2x 6pin PCI-e, no 8pin PCIe.

    Alcohol was created to help man cope...
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    KenMcC
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    Re: Massive PSU wattage difference - R9 280x 2015/05/05 14:38:10 (permalink)
    The way some GPUs power requirements are quoted vary greatly.  Some will say 650 watts which means the value is what is estimated with the GPU and Motherboard and all others in a PC would require. 
     
    What I usually do go the Manufactures website and see if they quote the real TDP (total max power at full normal load) for a GPU.  By Manufacture [MFG] I mean compare GPU Chip MFG and card MFG and see if they make sense.  Hope this helps. 

    KenMcC
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    tucker147
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    Re: Massive PSU wattage difference - R9 280x 2015/05/05 14:55:37 (permalink)
    The EVGA SuperNOVA 750 G2, CORSAIR HX750 & SeaSonic SS-750KM3 750W are all solid choices.
     
    If your looking for something a bit cheaper, the SeaSonic M12II 750 SS-750AM2 & EVGA SuperNOVA 750 B2 are also really nice psu's.
     



    The Banshee: Ryzen 5 5600 @ 4.65GHz 1.25V, CPU + 2X GPU Custom loop w/ 360mm & 240mm rads, Asrock X370 Taichi, 2X GTX 780 Ti SLI, EVGA 1300 G2, WD Blue 1TB (main storage), Corsair Force LS 120GB (OS Drive), Fractal Design Arc XL, 2X8GB G.skill Trident Z @ 3200 C14
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    knightsilver
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    Re: Massive PSU wattage difference - R9 280x 2015/05/05 19:48:07 (permalink)
    Link
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151132
     
    The Seasonic G-series, sem-modular and for the price, is a good dern bang4buck. The $99_650w/54amps and $114_750w/62amps
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