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HD 5770. Enough power supply?

Last response: in Components
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October 26, 2010 6:26:09 PM

Gonna buy this for verry cheap price. So am asking is this PC power supply is enough for my old video card HD 5770 http://img638.imageshack.us/img638/1538/21922781.jpg

PSU installed internal
http://img442.imageshack.us/img442/9833/902102437c4a0eb...

Won't be a problem running system like this?

More about : 5770 power supply

a b ) Power supply
a b U Graphics card
October 26, 2010 6:28:59 PM

30 amps on the 12v rail is plenty for the 5770.
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a c 164 ) Power supply
a c 235 U Graphics card
October 26, 2010 6:49:30 PM

you should be fine, the ATI 5770 is very power efficient
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October 29, 2010 4:48:48 AM

I have a similar problem, so I'll post it here instead of starting a new thread. I just bought a Powercolor 5770 and an Antec TP 750w power supply, but I'm not sure if this is an appropriate PSU to run this graphics card. According to the graphics card guide on this website (http://www.tomshardware.com/forum/279391-28-power-requi...) the 5770 needs at least 30 amps on the 12v rail, and ideally should have 38 amps. The trouble is my PSU only has 25 amps on each 12v rail, and the graphics card has only a single 6 pin power connector. Am I misunderstanding this or is do I really need to get a different PSU?
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a c 164 ) Power supply
a c 235 U Graphics card
October 29, 2010 5:01:08 AM

dermal_plating said:
I have a similar problem, so I'll post it here instead of starting a new thread. I just bought a Powercolor 5770 and an Antec TP 750w power supply, but I'm not sure if this is an appropriate PSU to run this graphics card. According to the graphics card guide on this website (http://www.tomshardware.com/forum/279391-28-power-requi...) the 5770 needs at least 30 amps on the 12v rail, and ideally should have 38 amps. The trouble is my PSU only has 25 amps on each 12v rail, and the graphics card has only a single 6 pin power connector. Am I misunderstanding this or is do I really need to get a different PSU?


those are the ATI recommendations and totally useless. They are listed to cover crap PSU people buy for $20. the antec truepower series are very good PSU. your antec has 62a on the 12v rail, more then enough for the ATI 5770, in fact more then enough for four of them.
a system with with the ATI 5770 needs a decent 400w unit with 22a on the 12v. the following system below won't even break 300w with the ATI 5770 during a stress test

Core i7 Test System Specs
- Intel Core i7 965 Extreme Edition (Overclocked @ 3.70GHz)
- x3 2GB G.Skill DDR3 PC3-12800 (CAS 9-9-9-24)
- Asus P6T Deluxe (Intel X58)




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October 29, 2010 6:13:36 AM

Thank you ct1615, your help is very much appreciated. I am still confused by the whole 12v rail thing, I'd assumed that a 6 pin connector from this PSU could only supply 25 amps due to each of the four 12v rails being rated at only 25 amps. So really each of those rails can supply the PSU's maximum total amps?
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a c 164 ) Power supply
a c 235 U Graphics card
October 29, 2010 10:09:15 PM

dermal_plating said:
Thank you ct1615, your help is very much appreciated. I am still confused by the whole 12v rail thing, I'd assumed that a 6 pin connector from this PSU could only supply 25 amps due to each of the four 12v rails being rated at only 25 amps. So really each of those rails can supply the PSU's maximum total amps?


I can understand your confusion, what you really have is a single 12v rail that has been split 4x, not four 12v rails. hopefully this helps you out.

What is "multiple +12V rails", really?

In most cases, multiple +12V rails are actually just a single +12V source just split up into multiple +12V outputs each with a limited output capability.

There are a few units that actually have two +12V sources, but these are typically very high output power supplies. And in most cases these multiple +12V outputs are split up again to form a total of four, five or six +12V rails for even better safety. To be clear: These REAL multiple +12V rail units are very rare and are all 1000W+ units (Enermax Galaxy, Topower/Tagan "Dual Engine", Thermaltake Tough Power 1000W & 1200W, for example.)

In some cases, the two +12V rail outputs are actually combined to create one large +12V output (Ultra X3 1000W, PC Power & Cooling Turbo Cool 1000W, for example.)


http://www.jonnyguru.com/forums/showthread.php?t=3990
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October 30, 2010 11:23:01 PM

Ah, I understand now. Thanks again for the info.
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!