What you're looking for, by the way, is what's called a "2x4" connector, as in "two connectors of 4 pins each". This is used to provide 12V power to the CPU -- newer boards tend to require two sets of those connectors, given the higher power draw requirements of CPUs. This is not a server-specific feature, by the way -- most Core iX motherboards today (desktop boards, that is) have 2x4 12V ATX power connectors instead of 1x4.
How PSU vendors advertise this feature, and how they phrase it, varies. You're going to have to look at the User Manual for each PSU, or (better choice) find product reviews with photos.
Here are some ATX form factor PSUs which do what you need, and you can see quite clearly how the way they advertise/phrase the 2x4 capability varies:
(not apparent from the product description -- I own this PSU which is how I know -- some review sites show pictures proving it, however)
These are in no way unique in any way; like I said, most PSUs today offer what you need, just make sure you read the user manual, find reviews, or contact the manufacturer and ask "Does the XXX model offer two (2) 4-pin 12V ATX CPU power connectors?".--
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