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HD 5770 or HD 6850

Last response: in Graphics & Displays
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April 29, 2012 12:46:50 PM

Hello:

I'm going to upgrade my GPU (currently a 9500GT) to a 5770 or a 6850. I know the second one is a lot more powerful, but the problem comes with my PSU. I've a 650W generic PSU with 28A in the 12V rail. I've used an online power calculator and it gave me this results:

-5770: Minimum:281W Recommended: 331W
-6850: Minimum:306W Recommended: 356W

I haven't got enough money for buying the GPU + A new PSU, so I want to know if I could run the 6850 or I have to stay with the 5770 (which is 30€ cheaper)

Thank you very much

More about : 5770 6850

April 29, 2012 1:04:06 PM

I have to question why your not concerned about using a generic psu, I mean I guess you don't care about your cpu, motherboard, ram etc?

The 6850 is slightly faster than a 5770. Either way you should be ok.

Also consider a 7750, it doesn't even require pci-e power connectors.
April 29, 2012 1:18:28 PM

geekapproved said:
I have to question why your not concerned about using a generic psu, I mean I guess you don't care about your cpu, motherboard, ram etc?

The 6850 is slightly faster than a 5770. Either way you should be ok.

Also consider a 7750, it doesn't even require pci-e power connectors.


The answer is easy: Now I haven't got the money to buy a new PSU. And if my PC runs with mine, it's OK. But I know it's not the best thing using generics, so in the future I think I will change it.

On the other hand, I didn't understand your answer. Would the 6850 work or not?
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April 29, 2012 1:24:25 PM

If it helps,the 5770 uses 108w under max load and the 6850 uses 127w under max load. http://www.gpureview.com/show_cards.php?card1=615&card2...

But,I am not sure you would be able to run any of these two on a generic PSU.If you can't buy a PSU+6850,then you can go for the 5770(+ Corsair CX 430 for 26 euros.).Hope this helps. :) 
April 29, 2012 3:37:16 PM

absxiith said:
If it helps,the 5770 uses 108w under max load and the 6850 uses 127w under max load. http://www.gpureview.com/show_cards.php?card1=615&card2...

But,I am not sure you would be able to run any of these two on a generic PSU.If you can't buy a PSU+6850,then you can go for the 5770(+ Corsair CX 430 for 26 euros.).Hope this helps. :) 


Bad news :??:  Where did you find that Corsair PSU? Because I can't find it anywhere.
April 29, 2012 5:48:43 PM

Oh no! XD
I supose I will have to look for something similar here in Spain.
I've found Tacens and Nox PSU at an afordable price, but I think they aren't very good brands, am I wrong or not?
April 29, 2012 5:48:52 PM

Oh no! XD
I supose I will have to look for something similar here in Spain.
I've found Tacens and Nox PSU at an afordable price, but I think they aren't very good brands, am I wrong or not?
April 29, 2012 5:53:30 PM

I forgot to ask another question, what could happen if I try any of the cards with my PSU and it doesn't have enough power??
April 29, 2012 6:23:44 PM

luquiboyn said:
. I've a 650W generic PSU with 28A in the 12V rail.

Are you sure? 28 amps from a 650 watt PSU is pretty pitiful, even for a generic.

Are you sure there is not a second 12 volt figure listed. And usually if you look down at the lower part of the PSU label, you will see a total wattage figure listed for the 12 volt output.

A CX430 has a 28 amp 12 volt rail. So the only real difference is that the CX is a more modern design and probably better built.

A PSU that can product 28 amps at 12 volts adequately power either video card.

Main symptom of inadeqate power in a gaming machine is usually seemingly random reset/reboot cycles during gaming when the load is highest on the PSU.
April 29, 2012 9:14:50 PM

I've seen another time the PSU's specs, and it sais 28A and only one rail, but below it is written to have 426W on the 12V. It's strange, because if I multiply 12*28 it's not that wattage.

On the other hand, if I can try the GPU without risk of breaking anything because of lack of power, and if you say it should work, I will give it a try.
May 14, 2012 9:11:30 PM

If it helps to someone with the same doubt, I finally bought a HD5850 and it works like a charm with my 650W generic PSU. So any of the previous cards should work perfectly, as they drain less power.
!