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PCI Power Rating

I am designing a PCI card which has a rather high power consumption.
Please can someone supply me with the following data for "conventional"

1.	Maximum power per slot. (25W ?)

2.	Maximum current on +12V supply. (500mA ?)

3.	Maximum current on +3.3V supply. (7.6A ?)

I understand that I should not be relying on the +5V supply as not all
motherboards will provide this voltage. Is this correct ? If not, then
what is the maximum current on the +5V supply ?

Thanks in advance.

Mark C Lewis
Equipe Electronics Ltd.