HD 5770 or HD 6850

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
14 answers Last reply
More about 5770 6850
  1. 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.
  2. 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?
  3. 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=636

    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. :)
  4. 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=636

    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.
  5. Don't laugh but I found it here- http://www.ebay.com/itm/NEW-Corsair-Memory-CMPSU-430CXV2-Builder-Series-CX430-V2-Power-supply-430-W-/320891969630?pt=PCA_UPS&hash=item4ab6a6e05e :D .I simply converted the price to euros and hurriedly posted.Very sorry for that.
  6. 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?
  7. 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?
  8. 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??
  9. http://www.tomshardware.com/forum/322966-28-list-recommended-psus

    http://www.tomshardware.com/reviews/power-supply-psu-review,2916.html

    To be honest, I didnt read them :D when I bought my CoolerMaster eXtreme Power Plus 460w but these should help you. :)
  10. 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.
  11. 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.
  12. absxiith said:
    http://www.tomshardware.com/forum/322966-28-list-recommended-psus

    http://www.tomshardware.com/reviews/power-supply-psu-review,2916.html

    To be honest, I didnt read them :D when I bought my CoolerMaster eXtreme Power Plus 460w but these should help you. :)


    Thank you dude, I will use them if I have to change the PSU
  13. absxiith said:
    http://www.tomshardware.com/forum/322966-28-list-recommended-psus

    http://www.tomshardware.com/reviews/power-supply-psu-review,2916.html

    To be honest, I didnt read them :D when I bought my CoolerMaster eXtreme Power Plus 460w but these should help you. :)


    Thank you dude, I will use them if I have to change the PSU
  14. 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.
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