Why doesn't my EA650 shut down? (SOLVED)

[VirtualLarry]

I was just thinking about this today. I have an Antec EarthWatts 650W PSU (Delta) powering four 9600GSO 96SP cards, overclocked to 650 core and 1620 shaders, 900 RAM.

Each card probably takes AT LEAST 75W, I think. That adds up to 300W.

The PSU has three rails, 22A, 22A, and 25A. As far as I know, the PCI-E are both on the last 25A rail. 12V * 25A = 300W.

So why isn't my PSU shutting down? It's under constant load (F@H).

Unless Antec set my current limiters higher than that, and was shipping the PSU in the same old packaging, with the same old label.

I mean, I probably shouldn't complain, as it's working. But there's a certain scientific curiousity here.

Edit: This explains it. The OCP set point is 33A, not 25A.
http://www.antec.com/Believe_it/product.php?id=NjY=

 

[DeathRayLoveMachine]

Your motherboard can supply up to 75 watts per PCIE port, according to the spec. That's enough to run an entire 9600GSO. Your actual power load is probably being spread across your ATX connector, the PCIE power connector on your motherboard, and the power connectors on your cards.