Antec Basiq 500watt good enough for ATI 5850

I cant find anywhere where ATI states the Amps on the V12 rail, it just says 500 watt PSU recommended. This PSU has two 6 pin connectors, two v12 rails, rated at v12 18a. Bringing the total to 36amps.

Here is a review and it can actually pull more watts than rated, it pulled 640 watts in this review.

www.hardwaresecrets.com/article/Antec-Basiq-BP500U-Power-Supply-Review/792/5

I dont really have a demanding system, just a basic computer with a q8300, 4gb DDR2 ram 800mhz, no extra drives.

Should I be worried about this, I know ATI did a wonderful job with the power consumption with the 5000 series, I think this power supply is enough, your thoughts? thanks.

it should work and i've heard of 500W PSU working with a 5850.

I have used a 500 watt PSU with the 5850.