This is mainly for those who know it's aimed for you...

 
Those Misc IO boxes hide a key function of the forwards compatibility of Bulldozer/Piledriver to Steamrollers/Excavators platform.

 
AMD Bulldozer is on top...
 
<890FX*/<990FX/<1090FX/C32/G34 <-- Bulldozer supports but isn't intended to be on these platforms.
(*needs to support AM3+ VRM standards)
 
Bulldozer has 42+ lanes of PCIE on it's die (I counted 52 but I suspect the extra lanes are for the bridge not the actual connection to the slots)
 
No one is talking about these PCIE lanes...and I searched hard and long about these PCI-E lanes that are just randomly there.
 
"Boulder" and "Austin" Socket GC36 gave me the hint but seeing the links...forwards compatibility is the focus of Bulldozer...
---
Edit P.S.:
While on my discovery exploration I noticed differences between Thuban's 3.1 HT Links and Bulldozer's 3.1 HT Links...
 
Bulldozer has 20 dots
Thuban has 16 dots
 
BD HT 3.1 => 20 bits * 2 * 3.2 => 16 GB/s <-- PCI-E 3.0 x8
TH HT 3.1 => 16 bits * 2 * 3.2 => 12.8 GB/s <-- PCI-E 2.0 x8
 
Which leads me to believe Hypertransport 4.0 will be up to 40 bit bi-directional links up to 8 GHz effective

wmmillsWOW!! Great job un-earthing this Seronx. Very interesting...im gonna have to try and do some searching on this too and see what i can find, not saying that you dont know what your doing, but the  more people looking for a answer the better our chances of getting one!! lol

I think the reason is because Socket GC33?/GC36 will be pin compatible with Socket C32/Socket G34 CPUs.
 
I'm unsure about AMx/FMx

^Also HT 4.0 is 16 GT/s so the new HT in Bulldozer must be HT 3.2