700W enough to overclock R9 290 and overclocked 3770k?

Shocking777

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Oct 31, 2013
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Hey, i've decided to buy the R9 290 as soon as the aftermarket coolers is out now i have the money for Christmas but the problem is as i do research it seems like the R9 290 recommended PSU is 750W. Now i like overclocking even if its not a must. Overclocking is just a fun thing to do to increase my performance, i have an oveclocked 3770k up to 4.2Ghz and currenty OC'd GTX 660. My main concern is if i buy the R9 290 overclocked it and my PC becomes unstable and i might just fried the PSU. Now should i buy a higher PSU or will it be enough?

My full specs:

Core i7 3770k @4.2Ghz
MSI Twin Frozr GTX 660 OC'd
Patriot PVI 16GB RAM 1600Mhz
WDC 1 TB 7200RPM + 120 GB intel SSD
LG 24x DCD-RW
GeLid GX-7 Fan
Lancool PC-K63