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PSU for hd 7850 2gb

Hello everybody
I have decided to upgrade my Graphic card to a Gigabyte 7850 OC 2gb Windforce. I have 3 options
regarding the PSU.

1.800W Umax (local Indian make) -very cheap,just Rs 1250 (~23$)
Shopkeeper told me not to go with it as its not good enough to even start the 7850.

2.Cooler master Thunder 500W (2 rails)
http://www.flipkart.com/cooler-master-thunder-500w-500-watts-psu/p/itmdbm7fefnpygyn?pid=PSUDBM7EDH7YSFTZ&ref=2b7b7d2d-db33-434c-864b-b8d0a0308f8e

3.Corsair VS 550W (1 rail)
http://www.flipkart.com/corsair-vs550-550-watt-psu/p/itmdg36xx8yzgjrs?pid=PSUDG34775NHYDHK&ref=edfdab09-e265-42b1-bac6-116205a12e3c

Please suuggest the best option amonst the above three.I dont intend to overclock any of my components.And also do I need to change my cabinet?The shopkeeper said the current cabinet is too cramped and there wont be sufficient cooling when a branded PSU with thick wires is used.

I have 160 gb HDD,1 optical disk drive,amd 8120 and 4gb ram.

I have already burnt my motherboard and hd 6670 last year.So please suggest the best option for me.

Thanks a lot in advance.
5 answers Last reply Best Answer
More about 7850
  1. Best answer
    3. corsair vs550. the xtreme from cm is a piece of junk.

    and number1 is just hell no.

    option 3 is ur best bet.
  2. Best answer selected by crysisforce.
  3. cheers my friend.
  4. iceclock said:
    3. corsair vs550. the xtreme from cm is a piece of junk.

    and number1 is just hell no.

    option 3 is ur best bet.



    Thanks a ton.I just hope its sufficient.
  5. it will be.
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