Please help and don't ignore

Ignore what ?

I just post stuff on here sometimes and nobody reply's......

Aha.

Sorry, being a bit tipsy i believe.
I'll have a look at it, be back later.

Well your first link doesn't work. It only shows the site so i can't see your system specs and so. The psu is reasonable good quality i think.
According to guru full load the system uses 421W so 500W should be enough theoraticly, BUT reccomended is a 650W supply to be safe. The psu won't like being stressed out to the max for longer periods of gaming.

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.

http://www.guru3d.com/article/radeon-hd-6850-6870-cross...

Check this HD 6850 Crossfire power consumption question

http://www.tomshardware.com/forum/327362-33-6850-crossf...

I thinks you need the 650w PSU if you have two HD 6850 for crossfire.

How old is your PSU? my modxstream pro 600W blew up last saturday after 1 year of non intensive use. You should get a better quality 650w at least.

Than again according to this it is enough ; http://www.tomshardware.co.uk/forum/304367-15-power-sup....

That's the tricky part, one guy says this, another says that. It probably will run but i won't guarantee it's safe.

there are plenty of people who have had good quality corsair and antec PSU's blow up after less than a year of use also. It happens to every manufacturer. Dont judge a brand from one faulty product, and it may have been an environmental fault too, not a manufacturing fault. Power surge, dirty power, dusty environment, cockroach shorted it out, etc. etc.

"cockroach shorted it out, etc. etc."

Or flies for that matter, had one of them fried crispy in my old P3.

Yeah, it was most likely a power surge but I don't blame ocz, I just felt upset because I live in another country and the rma process and shipping would be expensive and not worthy, I guess I had bad luck with that one.

Thank you all for your comments! I'm sorry i haven't gotten back to them in a timely fashion.
I think i'm going to try it. No ocing; use as little power as possible! And if it blows up i'll buy another.
Could the psu dieing kill my video cards?

yes, when a PSU dies it can push a voltage spike through other components. I have experienced this and enede up with a dead PSU and motherboard.