psu upgrade needed ?

[yumcookies]

hello overclockers im thinking about upgradeing my gpu but i dont think my psu is up to the job my current system is :

i5 2500k stock
8gb ddr3 vengeance
coolermaster truepower 620w psu 3 x 12v rails at each 19 amps
gtx 460
2x 250gb hdd
dvd rw
creative x-fi soundcard
wireless card
5 led case fans
4 cathodes

i want to upgrade my gtx 460 to 2 ati 6850 in crossfire will my current psu be ok or will i need to upgrade that aswell ?thanks in advance

 

[Lemin]

Here is Guru3D's power supply recommendation:

Radeon HD 6850 x1-On your average system the card requires you to have a 450 Watt power supply unit.

Radeon HD 6850 x2-A second card requires you to add another ~130 Watts. You need a 650 Watt power supply unit.

Radeon HD 6870 x1-On your average system the card requires you to have a 500 Watt power supply unit.

Radeon HD 6870 x2-A second card requires you to add another ~150 Watts. You need a 700 Watt power supply unit.

The more you overclock and tweak, the more power you will use, adapt to that, we always advise you to get a power supply that is more capable then you'll use, have some reserves, please, do not let a PSU be a limitation.

http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4

Id get...

http://www.overclockers.co.uk/showproduct.php?prodid=CA-004-XF&groupid=701&catid=123&subcat=

 

[CinderzFTW]

the 6870 is only 120£ atm on OcUK