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Is My PSU enough to handle another Graphics Card? {(!URGENT HELP!})

post #1 of 27
Thread Starter 
Guys i really need urgent help on this from someone with someone with experience around this area!

Ok well i was thinking of upgrading my computer from 1 sapphire 7770 to 2x Sapphire 7770 into crossfire, but i am not sure if it will work,

HERE ARE MY SPECS:
PSU - 500w Thermaltake PSU OEM 30/8

http://www.thermaltake.com.au/products-model.aspx?id=C_00001786

Mobo - Gigabyte GA-970A-D3

GPU - Sapphire 7770 Ghz edition

CPU - AMD 8120 (8 core cpu)

RAM - 16gb 4x4 G.Skill 1.5v 1600

--MY PSU--

DC Output- +3.3v / +5v / +12v1 / +12v2 / -12v / +5Vsb
Max Output- 25a / 28a / 14a / 15a / 0.3a / 2.0a
Min Output- 0.5a / 0.3a / 1a / 1a / 0.0a / 0.0a
Edited by ProXStyler - 9/7/12 at 7:56am
post #2 of 27
Quote:
Originally Posted by ProXStyler View Post

Guys i really need urgent help on this from someone with someone with experience around this area!
Ok well i was thinking of upgrading my computer from 1 sapphire 7770 to 2x Sapphire 7770 into crossfire, but i am not sure if it will work,
HERE ARE MY SPECS:
PSU - 500w Thermaltake PSU OEM 30/8
http://www.thermaltake.com.au/products-model.aspx?id=C_00001786
Mobo - Gigabyte GA-970A-D3
GPU - Sapphire 7770 Ghz edition
CPU - AMD 8120 (8 core cpu)
RAM - 16gb 4x4 G.Skill 1.5v 1600

Thermaltakes PSU calculator says you should be fine... see below

Thermaltakes PSU calculator recommends at least 423 watts for your setup, this is assuming that you have 1 HDD, 1 DVD Drive, 4 - 120mm Fans, I assumed you had at least this because when you're requesting power supply information, you need to really specify EVERY component in your computer considering they ALL need power to run. This is also assuming that you are NOT overclocking your CPU. I'm pretty sure most PSU's are most efficent around 80% load

OK and I think I just caught myself, I don't think your PSU Even has enough 6-pin connectors to add another graphics card. You will probably need to purchase a higher end PSU just for one more 6 pin, unless you want to use those Molex to 6-pin adapters, EWWWW!!!!

20+4-pin Main Connector X 1
4-pin +12V Power Connector X1
4-pin Peripheral Connector X 5
4-pin Floppy Connector X 1
6-pin PCI Express Connector X 1
5-pin SATA Connector X 3
CPU 4pin to 4pin adapter X 1
CPU 4pin to 8pin adapter X 1
Edited by NASzi - 9/7/12 at 7:36am
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post #3 of 27
Normally I would say a 500watt could do two 7770s, but I don't know if I would trust a Thermaltake PSU. They aren't really known for high quality and I would like to have more than 15amps on a 12v rail...I think I have a 350watt around my house with about that amperage on the 12v rail.

7770s are about 80watts

That CPU is going to need about 100w

The rest of the system will be about 50w

So 310watts or so...500 would be some good head room.

Though that 15 amp 12v rail seems puny...makes me wonder if it is a typo. For two 7770s I would have at least 30amps or so
Edited by Vagrant Storm - 9/7/12 at 7:32am
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post #4 of 27
That Thermaltake has got no chance... or at least not for very long.
I'd pick up something a bit more trustworthy and reliable like a Rosewill unit at around 500-550W.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182262

The OEM is Super Flower.
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post #5 of 27
Thread Starter 
I love this forum thank you soo much for quick reply
post #6 of 27
Thread Starter 
Umm im pretty new to the computer world and i dont know much about power supplys but the PSU u suggested me is only 50 watts more so does that mean another 50 watts will be enough for me?
post #7 of 27
Quote:
Originally Posted by ProXStyler View Post

Umm im pretty new to the computer world and i dont know much about power supplys but the PSU u suggested me is only 50 watts more so does that mean another 50 watts will be enough for me?

Yes and there is 45.5 amps on the single 12V rail smile.gif Which is far better than the paltry 15 amps with that Thermaltake.
The Thermaltake is also only really rated for about ~400W (500W is peak at any one time) vs ~550W+ continuous from the Rosewill.
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post #8 of 27
15 amps on the 12v rail, nope, it won't do Crossfire 7770.

Sorry buddy.frown.gif
    
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post #9 of 27
Thread Starter 
thank you very much it would be nice if you could tell me a thing or two on this PSU thing and how can i choose one
post #10 of 27
Quote:
Originally Posted by ProXStyler View Post

thank you very much it would be nice if you could tell me a thing or two on this PSU thing and how can i choose one

Look no further: http://www.overclock.net/t/183810/faq-recommended-power-supplies/0_30

smile.gif
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Ol' Sandy
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