5770 & 5750 Real power&amp Requirements

grishnukh

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Hi guys.
If anyone is sure about 5770 &5750 in load and 100%stress power and specially amperage requirement Please Tell Us.
Thnx 4 your time & attention.
 

bboynatural

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grishnukh

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guru3d is telling both of 5770 & 5750 require same amperage
How can It be?
there is something else my Pc isn't a high-end:
amd 4800+ .asus m2n-e _2*kingston 1gb 800mhz _hdd:wd 1tb without anything else.
so you think my pc with 5750 will require 40 amp on 12v?
 

bboynatural

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yes a quality 400W PSU.
A quality 400W PSU like the antec earthwatt DOES have enough amp on the +12RAIL.
This was made by professional and reliable reviewers.... I think they might have taken into account the CPU but still, it will require around 40amps...
I trust guru3d...they are professionals... I think they made all the required tests...
Well even if you go check on ATI certified PSU for the HD5770, you will see that ALL the psu they refer do have 40AMPS on the +12....
 

Kari

Splendid
http://www.techpowerup.com/reviews/Sapphire/HD_5750/28.html
5750 85W in furmark
5770 112W in furmark
BUT
Furmark Stability Test at 1280x1024, 0xAA. This results in a very high non-game power consumption that can typically be reached only with stress testing applications.

edit and just to make sure ppl understand it, 112W equals 9.33 amps @12V for the card itself... psu ratings depens on the rest of the system as well...
 



This is the second time today Guru have been linked too and the second time they have been talking complete crap, the card dosent need 40 Amps at all. :pfff:

Mactronix
 

bboynatural

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Yes anybody can assume that...
But give me any proofs...?
The card might not require EXACTLY 40 AMPS, but taking many other aspect in considerations, like the CPU who is also on the +12, you get around 40AMPS.
This is kind of, the SAFE zone. So basically your saying something, Im linking to something.

http://ati.amd.com/products/certified/powersupplies.html#pstop

The HD5770 isnt "listed" but it's around the same as a HD5850, both being 40NM

If you mind checking, you will see that all the listed PSU have 40AMPS, you might find a few 32 tho.
 



I'm sorry but all you are going by is one review site which you trust but is in this case wrong. Go to some different sites i have and i tried 4 different review sites and they all agree with what techpowerup are saying in the link Kari gave us.
The 5770 is nothing like the same as the 5850 , The chip is completely different.

I know from years of experience that you just don't need that much power to run a card that uses around 110 Watts, that's around 9.2 Amps.
I have looked at certified power supplies for this card and the very first 500 watt unit i picked out has 34 Amps on the +12V rail.
All i see as required in the vast amount of reviews is a 450 Watt PSU with a 75watt PCIE connector.

Mactronix
 

bboynatural

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By personal experience, I can say that the AMP should not be taken lightly, and that if Guru3d recommend 40 AMPS (wich is again a SAFE zone, not the real requirement) and that ATI certified PSU is 34 (only the first one you picked.) there is a reason.

Ibougt a HD4850 and directly plugged it to my ultra 500W 28AMPS psu.
The results were HORRIBLE. 19FPS on assassin's creed.
Fps would drop from 60 to 30 in unreal tournament whenever I get into action or look far away.

I bought a 32Amps PSU like recommended from guru3d and I got magnificient results. My hd4850 suddenly had the usual reviews fps in any games.

Now of course this is my personal experience and I have no proof to it. But to the OP, you can risk believing whatever you want to, but get ready to buy another PSU. AT LEAST take a 32 or 34 amp, they don't cost quite that much. Just chek the antec earthwatt 650 or 500W.

Of course, this is my personal experience and I have no proof to it. :)
But it's up to the OP, no one here will be able to prove it.

Also at mactronix... Can you please post those links...like I said, your only saying something witouth giving us anything to bite at... I posted a real link. Please post.
 

shubham1401

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The 400W Corsair CX400 has 30Amps on 12V rail...
That's a quality unit.
It can easily run 5770.

@bboynatural:
As Compared to some older cards like 4850 and GTS 250 the HD 5770 takes less power...
And those cards are trusted to run on a 400W PSU minimum.

@OP:
Corsair CX400 or equivalent PSU will provide sufficient power. Especially if you are on a budget I recommend that one.
Otherwise Get a VX450.

If you are still concerned that the 450w PSU will be bare minimum then Go with VX550 from Corsair.That will handle any single card config.


 

shubham1401

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That's bcuz they have those units rusting in the cupboard.
And they don't want any PSU bottleneck...After all that's for a review...
 



Did you want any link specially ?

http://www.sapphiretech.com/presentation/product/?psn=000101&pid=290

Mactronix :)
 

grishnukh

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This is the question:
Is it always true? wattage/voltage=amperage
I think not. because of this calculator:(( http://web.aanet.com.au/SnooP/psucalc.php))
you can change the vga form an ati to a Nvidia . your power usage will increase but amperage will be less!!
I think the card's current draw depend on it's core frequency and power usage depend on Memory bandwidth . what is your Idea?
 

Kari

Splendid

young and freedman says that calculator is in error. Though I must say that is one of the most thorough psu calculators I've seen. :eek:
But it's getting too late to really tinker with that thing... maybe later.. zzzz
 
HD 5770 - 3DMark06 power consumption ~ 61.2w or 5.1a
HD 5770 - Furmark Stress Test ~ 81w or 6.75a


HD 5750 - 3DMark06 power consumption ~ 43.7w or 3.6a
HD 5750 - Furmark Stress Test ~ 60.6w or 5.05a

Source:
http://www.xbitlabs.com/articles/video/display/radeon-hd5770-hd5750_5.html


5700_power3dm.png


5700_powerfur.png


Max power consumption under typical conditions will probably be between the above wattages. Furmark should represent max power consumption since it stress every single part of the GPU which is highly unlikely to happen in a game
 

I use it ( the link is in my configuration )
Seems to be pretty close when compared with the highest wattage I've seen on my killawatt meter multiplied by the approximate efficiency of the psu at that load.
Also comes within 2 or 3% of the readings given by my Odin GT.
 

grishnukh

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How did you calculate the amperage?
Wattage/voltage=amperage?
Are you sure about it?
Is this a rule or basic in physic?
who can tell me?
PLz....