Dual 5770 on st50f

[folded]

can i run 2 5770 in crossfire under ST50F? they are energy efficient right? does that mean that they are also exempted in the rule that 1 gpu=500-550w and dual=600-700w psu..

i will be building a rig with intel i5 as my cpu

i wanna save as much as i can but the 600w psu costs twice as much as the 500w one..

will a 500w 80efficiency psu handle the load?

 

[Herr_Koos]

Doubtful. I know the 5770 is very power efficient, but remember that wattage is only part of the story. The PSU needs to deliver sufficient current to power both cards. I found this quote from a review of the card:

Radeon HD 5770 CrossfireX (dual GPUs)
You need a 600+ Watt power supply unit if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 55 Amps available on the +12 volts rails.

 

[folded]

oh..thats bad news. another blow in my budget hehe

wil this psu work --Corsair CMPSU-620HX 620w
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004
i will not buy in newegg,just using the site for secification reference

or this one

Silverstone ST60F 600w (i think this is the one i am loking for)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004

those are the only PSU available that rates above 500w and are 80plus certified

 

[Herr_Koos]

Both should be OK, I guess. Corsair have a good reputation for building quality PSU's, but I've never owned one so I can't really comment.

 

[folded]

tough on the budget but i wnt this built for christmas

 

[Zenthar]

I might be wrong, but won't 2x5770 performance be close to a single 5870? If available and close in price to 2x5770, you might want to go that way, it would probably be even more power-efficient.

 

[JohnnyLucky]

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the +12 volt rail(s) can easily power an overclocked system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the +12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

In addition the power supply should be at least 80+ Bronze certified for energy efficiency. There are some models available which have achieved 80+ Silver and 80+ Gold Certifications.

Before purchasing a new psu you will need to decide whether you will eventually have a pc with one or two video cards.

Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. An example would be the Antec Earthwatts series which is a major improvement over Antec’s older psu’s like the Basiq models.

 

[aznshinobi]

Lol Johnny copying and pasting your other post XD. But ummm... Idk what your talking about but.... Rosewill has some, and I've heard good things from Rosewill. Umm.... How much are you willing to spend on the PSU? The 2 links you gave were the same PSU and it wasn't the 620HX. If you were to buy the 620HX I'd rather get the 650HX which is cheaper, and I'm pretty sure that its Bronze 80+ Certified. The 620HX your talking bout is 10$ more than the 650HX..... Just so you know.... Anyway +1 Johnny too.

These are some PSU suggestions.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012&Tpk=650hx

Rosewill Xtreme 750-watt 80+ Certified: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182067

Rosewill Bronze 750-watt 80+ Bronze Certified: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182186

 

[deathsentry]

So if you have an existing PC (factory created) and wanted to get a card with high power supply requirements, can a PSU be external or does it require installation inside the pc?

 

[Zenthar]

I think thermaltake still sells VGA PSU. The only one I could find takes two 5.25 drive bays for 650W, but I remember they had 250W available that took a single bay.

250W: http://www.thermaltakeusa.com/product/Power/PurePower/w0130ru/w0130ru.asp
650W: http://thermaltakeusa.com/Product.aspx?S=1207&ID=1544