Can PSU of 550w support GTX 780 and my current systems?

guntapon_mahanonda · Jun 17, 2014

My current systems:
CPU=i5-2500k @ 3.3 3.6 Ghz
Motherboard=Gigabyte z68m-d2h (http://www.gigabyte.com.au/products/product-page.aspx?pid=3947#ov)
Ram =16GB
HDD = 1x 200GB SATA and 1x 120GB SATA (they are really old)
Graphic card=Power Color Radeon HD 7770 1GB
PSU=ASUS 550W

I'm buying a new graphic card and a new hard drive
New Graphic Card = Geforce GTX 780
New hard drive = 1x SATA III 1TB and 1x 120GB-240GB SSD (haven't chosen which SSD yet)

My question is that will my power supply be okay to support the new system?
Also, is my current mother okay to use?
Please note I don't really have that much budget and I definitely want to get GTX780

Please kindly help me. Thankss

dark_globe · Jun 17, 2014

better quality 550w power supply can handle gtx780
but unfortunately yours is not good enough to risk it ...

cheapest unit i can suggest is this one :
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&ignorebbr=1

better to go with some even more powerfull unit to have more additional headroom for overclocking
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371059&ignorebbr=1

both of them are made by seasonic (one of the most reliable manufacturers)

your motherboard is good although not exactly top of the line amongst Z68 motherboards ...

guntapon_mahanonda · Jun 17, 2014

dark_globe :

Thank you for your suggestion!
So, mother board is okay.
After this upgrade (Graphic card and HDD), I won't be upgrading my PC for another 3-4years. I'm thinking maybe then I will SLI the GTX780. So, should I just get the 750w now or 650w is still good if I wana SLI the GTX 780 in the future?

Another question, with my systems as mentioned above, do you think I will need some sort of water cooling system for the graphic card?or the GTX780's cooling system is already good enough? (I read some reviews and most of them say GTX780 doesn't really heat up that much?)
I'm sorry but I'm a bit new to this haha.

Beezy · Jun 17, 2014

ist not actually about how much wattage the PSU has. 550-650 is plenty for most single GPU builds. What you want to know is the the AMPERAGE on the 12V RAIL on the ASUS PSU (if you cant find out tell me the EXACT model). Then you check and see the REQUIRED APMS on the 12V RAIL for the GTX 780. if the PSU has more AMPERAGE than the GPU requires you are in the clear. if it has the same amount its or less than the GPU requires, its not recommended

guntapon_mahanonda · Jun 17, 2014

Beezy :

it's this one here
http://www.asus.com/Power_Supply/A55GA/specifications/

Thanks for your post

Beezy · Jun 17, 2014

http://www.newegg.com/Product/Product.aspx?Item=N82E16817712003

is this the one? does it even have the proper 6 and 8 pin power connectors for the GPU?
i dont like the psu manufacturer site because they tend to make themselves look better than they really are.

on newegg it says it has two 12V rails each with 18 amps provided. The combined amperage is likely 34 or something just under 36 amps...the GTX 780 needs 42 AMPS on the 12V rail. i would NOT run it on that power supply, and how much can you spend on a new power supply?

Truth is you would likely be fine with a 770. What resolution do you play at?

guntapon_mahanonda · Jun 17, 2014

Beezy :

Yes that's the one. Thanks for that and you're right, the manufacturer website is not really a good one to check haha.
I have about 90-110$AUD for a new power supply. What do you think of Seasonic S12G 750W? Is this one okay? Also, would this one be able to support SLI GTX780 in the future? (just curious)

Thanks

dark_globe · Jun 17, 2014

air cooling is good enough for gtx 780 ...
sli is not the best idea on your motherboard
since the second pcie express slot is only pcie 2.0 x4 ...
it would slow down the second 780 ...
http://www.tomshardware.com/reviews/pcie-geforce-gtx-480-x16-x8-x4,2696.html
even gtx480 is slowed down a bit running at 2.0 4x bandwidth
and gtx780 is much more powerfull video card ...

edit: now i noticed your motherboard does not even support SLI ,
only crossfire ...
so SLI is out of question anyway ...
power supplies i suggested above both have enough amps on 12V rail for single 780 (45 and 48) ...

guntapon_mahanonda · Jun 17, 2014

dark_globe :

THank you for your advice. Now I'll be getting the new graphic card and new power supply. Is this PSU okay? http://www.newegg.com/global/au/Product/Product.aspx?Item=N82E16817151137

Anyway, any suggestion about the hard drive? I think my current hard drive is way too old and slow haha.
What should I get? which combination of HDD/SSD/SSHD? I want at least 1TB. The SSD makes computer runs a lot faster right? Any suggested company?

Beezy · Jun 19, 2014

the Seasonic PSU is wonderful, one of the best power supply manufacturers around. Get an SSD if you can afford it for the Operating System and important programs. A spare HDD (500GB +) should be used for storage of games, movies, and music etc.

the extremely fast Read/Write speed on the solid state drives (SSD) mean that Windows will start in a fraction of the time it normally takes to boot and load. Also all programs and files on the SSD will launch faster, and transfer (copy/paste) within the SSD will be extremely fast too. Though you should note dragging a file from the HDD to the SSD will take a long time still because the HDD is so slow compared.
i suppose if you can afford it go SSD all the way!

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Can PSU of 550w support GTX 780 and my current systems?

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