Upgrading to HD 7770 on current PSU


I'm planning to upgrade my GPU to the HIS iCooler HD 7770 1GHz Edition. I wanted to know that my current power supply is good enough for this card or not. My complete system specs are as follows,

PROCESSOR: Core i3 3220 3.3 GHz Ivy Bridge
RAM: Kingston 4GB DDR3 1333MHz
GPU: MSI HD 5450 1GB DDR3 650MHz
HDD: Seagate 500GB SATA II
PSU: ThermalMaster 420W ATX without 6 pin connector - 12V1 = 10A and 12V2 = 13A, Total 12V = 23A

I'm an everyday gamer and I plan on using a MOLEX (4 pin to 6pin converter). Will my power supply be able to handle the GPU along with my system ?
6 answers Last reply
More about upgrading 7770 current
  1. No it will not be enough. Don't upgrade to HD 7770 without getting another power supply unit.
  2. A 7750 would be more appropriate

    Uh ouch never mind, 16A @ 12v = 192w... Ehhh, it might work but its a question of how long really. That power supply is garbage assuming its the one I think it is: http://www.coolermaster-usa.com/upload/download/380/files/TM-420W.pdf
  3. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026
    this one will do nicely. dont buy Cooler Master unless its a silent pro.
  4. Thanks to all -- Will the COOLER MASTER GX Series 450W be suitable replacement to my current one ?
  5. The gx series is garbage
    Only the silent pro from cooler master is good
    The 430 I listed is a solid psu and will serve you well
  6. Well, honestly, now I am currently running with a HD 7770 with a CM 460W PSU, and I must say the performance is quite well, without OC. The rest of the PC Specs are the same. :P - Battlefield 3 at AVG 46-47 FPS @1280x1024 :P :P

    Anyway thank you everyone for their sincerest response. Cheers :)
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