Any Alternative Power Supply for a Graphics card?

[-Ngu]

I am planning to buy one of these- ATi Radeon R7 250x, Radeon HD 7770 OC edition.

I have a limited budget so I can't opt for a better card and there's a problem.
I have a local 550W PSU which doesn't have the 75W 6-pin power connector required for the above cards.

Now buying a new PSU will affect my budget and I won't be able to buy one of those cards.
So, I was thinking if there were any alternative methods for powering the graphics card?
I mean any external power supply [ after learning about the volts, amps, watts and those 6-pins].
Or a connector, USB to 6-pin.. i.e powering the card via the backside usb ports.
Or any alternative methods apart from getting a new PSU?

I know this sounds too crazy but weird doubts come in your mind when resources are limited and you want the best out of it!

I need one of those graphics card to run on my pc since those are the entry level gaming cards that fit in my budget.
If there are no alternatives for this power supply problem then i will have to go for radeon hd 7750.

 

[ne6togadno]

there is molex to 6 pin (or to 8 pin if you need 8 pins) connectors.
https://www.google.com/images?hl=bg&biw=&bih=&q=molex to 6 pin&gbv=2&sa=X&oi=image_result_group&ei=NRwgU9nPEoiA7QbnzICgDw&ved=0CB8QsAQ

edit:
from list of your options take r7 250x and skip HD7xxx unless there is a big price diff between them and r7

 

[rubenclavs]

Radeon R7 250x will be good.

Plus there is a molex to 6 pin free with the purchase in the box.

 

[Devon68]

From the 2 cards you plan on buying a R7 250 would be better but if you could save up some money you could get the GTX 750 which doesn't need any power from the PSU.

 

[-Ngu]

there is molex to 6 pin (or to 8 pin if you need 8 pins) connectors.
https://www.google.com/images?hl=bg&biw=&bih=&q=molex to 6 pin&gbv=2&sa=X&oi=image_result_group&ei=NRwgU9nPEoiA7QbnzICgDw&ved=0CB8QsAQ

edit:
from list of your options take r7 250x and skip HD7xxx unless there is a big price diff between them and r7

I did some research about that molex connectors...
but I can find only these cables from my psu..
1x12V ATX power
1x 20pin/24pin power cable...[not sure if 20 or 24
2x peripheral cables.. each cable having 2 connectors

Now 1 peripheral cable is connected to HDD n other to DVD drive..
each peripheral cable has 2 connectors so.. there is a connector on both cables which is free..

So, can i connect the 2 molex pins from the 6pin connector to these peripheral cables??
Will it be sufficient to power the card?
Is it safe?
I have a XTech P4 550W ATX 2.03 Model: XT-550-24
Ouput:
+3.3V |+5V | +12V | -5V | -12V | +5VSB
30A | 33A| 24A | 0A | 0.5A | 2.0A

 

[rubenclavs]

^ Yes two molex from the PSU to power up the 6 pin to the GPU.

550 watts is enough for the whole build.

 

[-Ngu]

^ Yes two molex from the PSU to power up the 6 pin to the GPU.

550 watts is enough for the whole build.

See the Picture
https://www.dropbox.com/s/p1hhshgfqc5h4hv/PSU.jpg

 

[ne6togadno]

after this http://www.tomshardware.co.uk/forum/id-1796053/radeon-7850-current-psu.html
i think it will be better if you change psu first

edit:
you connect it only to one of the cables not to both.

 

[-Ngu]

after this http://www.tomshardware.co.uk/forum/id-1796053/radeon-7850-current-psu.html
i think it will be better if you change psu first

edit:
you connect it only to one of the cables not to both.

but that's for 7850... i am talking abt 7770 or r7 250x

 

[DF is BUSY]

looks like that power supply won't do; best you find a gpu that doesn't require external power.

 

[ne6togadno]

no it is about quality of psu. when psu fail it can also damage other components.
what do you prefer buy half new pc when psu die due to increased load or to delay gpu upgrade a bit but have descent psu that wont kill half (or whole) pc if it fail.
you dont need to buy seaosonic or corsair platinum psu. even cheap fortron is better then your current psu
look for this one at your local resellers. price wont be more then 30-35 euro
btw pls add your system specs in your profile