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Can I safely power an 8800 Ultra from a single (twin plug) PCI-E cable?

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I'm putting together a PC from parts I have in storage and some I sourced used from eBay. Unfortunately, the PSU did not come with the extra cables (I didn't know it was semi-modular). It has four 12v rails. Is the single twin plug PCI-E power cable capable of transmitting power from all four rails, or will I need to dig out a spare modular cable from storage and pray it fits?
 
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If your 12V rail has at least 20A no problem there ultra consumes max up to 200W but this is usualy lower and don't forget cpu uses 12V too so ideal would be at least 30A on 12V.
 
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The first two rails are 22A, the second two are 25A. I'm less concerned about the amplitude, and more concerned that one cable might not be enough.
 
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It's ok then no probs
 

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It is more than likely not a true multi-rail PSU anyway. It is likely a single rail design with multiple over current circuits. So hook it up, if the OC circuit trips and the unit shuts down, you know your answer.
 
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