Is a 460W PSU enough for a Sapphire AMD R9 290 TRI-X OC Graphics Card?

spaceowl

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Dec 21, 2014
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I want to get the above mentioned graphics card but just checked and apparently the recommended wattage is 750W. My current PSU is 460W and it's not branded - it came with my HP PC, so I don't know how reliable it is.
My current set up is an Intel I-7 quad-core processor and an NVIDIA GTX 660 (OEM)
I was wondering if it's 100% necessary to get a new PSU, or if there's some way to just limit the power usage until i can get a new PSU?