ATI 6850 CrossFire power consumption

[Xtrastor]

Hi guys, I have an ATI 6870, and I'm getting a 6850 that a friend of mine is not using anymore, I know I can CrossFire those card even if they are not exactly the same, and I know my 6870 will work as a 6850, but well 2x6850 is better than just 1 6870...
Now my concern is power consumption, I have a OCZ GameXStream 700W ( http://www.ocztechnology.com/ocz-gamexstream-600w-700w-power-supply-eol.html ), it comes with 1 8-pin connector and 1 6-pin connector, my 6870 needs both, so I was wondering if I could connect the other 6850 (this needs only 1 6-pin connector) with a 4-pin to 6-pin cable ( http://virtuapin.net/images/adapter-2x-molex-6pin.jpg ), do you guys think I would be overloading my PSU by doing so?...

Right now I have connected:
-2 WD Green Sata 3 HDD
-1 SSD OCZ Agility 3
-Motherboard, 12GB RAM (6x2GB), Intel Core i7 930 @ 2.80
-5 Fans, and some cathode lights
-NZXT fan controller

I would appreciate your help
Thanks.

PD: If I run this PSU calculator, it tells me that my PSU can handle it but I just want to make sure so I wont burn it out or something ( http://www.thermaltake.outervision.com/ )

 

[randomkid]

No worries about it. 700W is enough for 6870+6850. I run 2x6950 on a Corsair HX620 using 2 Molex to 6PIN converters for the 2nd card without any problem. I also based my decision to do that on the psu calculator.

 

[Vettedude]

It'll be fine, especially since the 6870 should clock itself at 775 MHz like the 6850.

 

[slumby]

am crossfiring 2 6850s at the speed of 940/1150 /1.172v using 650 psu so i guess u would be fine even after extreme overclocking

 

[Xtrastor]

Best answer selected by Xtrastor.