Is molex to 6 pin safe?

[xianate]

I currently have an R9-270 in my build and i am planning on upgrading it to a R9-290.

I have an 850w PSU with a single 6+2 connector however the R9-290 requires a 6+2 pin and another 6 pin connector. Is it safe to use one of the molex to 6 pin converters?

I do plan on upgrading my PSU soon but right now I just cant afford an R9-290 and a proper PSU with the necessary connectors.

 

[xianate]

Thanks for the reply.

My currant build is a

990FX-UD3
FX 8320 @4ghz
R9-270
8GB 1600mhz
and a CIT branded 850w psu, black edition apparently.

Would something like a CX 600 or 750 from corsair do the job for me?