6509 power supply question

Hi All

We have a 6509 with 2 x 1300W power supplies? rephrase we had :) - anyway, one of the power supplies has died, we are sourcing a replacement however, in the meantime I have another 6509 sitting next to me however it has 1800W power supplies.

The question

Can I run a 6509 with 1 x 1300W and 1 x 1800W (redundant)? Are the issues with doing this we should be aware of? I have asked this question of cisco integrators however all we get is "The engineers have put their heads together and say NO"

Its not something we would normally do however this is only temporary but I cant do until we know conclusively that it will not have a detrimental affect on the 6509 or any of its contents.

Thanks