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No overclock so you save money but £80 for Double Vram and a top quality after market cooler on a custom PCB featuring extra ports? I think thats a rather tasty way to lay out an additional £80![]()
Well yeah
I meant that the second 16x lane on most boards is covered up by a triple slot card though. From the boards I've looked at anyway.
A Custom PCB will generally be a no go for water cooling. Just an headsup for people.

No? That depends on your motherboard. The only thing different about these cards is that the cooler on them in 2.5 slots wide, so you need 3 free slots to have enough space to fit them onto your mobo.
You definitely cant triple or quad SLI them though, theres no motherboard that will have enough slots to allow a total of 9 to be taken up by 3 cards.
bottom slot blocks no other slots as well 
You are factually incorrect
ASUS super computer has 7 slots
so
each X is a slot
X PHANTOM 580
X
X
X PHANTOM 580
X
X
X PHANTOM 580
bottom slot blocks no other slots as well
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They are nice, i had a p6t7 super in a cuda farm, but ditched it in favour of more CPU power (folding)
The "problem" with them is if you fully populate the 7 slots the board cannot give enough power to the GPUS.....
Same for EVGA classified etc etc
Yes you would need a good sized case to accomodate the drop at the bottom..


Dont they have two extra molex connectors like the R3E?
When running 2 or 3 cards, you plug in one extra molex, when running 4 you plug in both. The bottom molex on the R3E cant be plugged in unless you have a case that can take a double slot card in the bottom slot, which makes sense since its only needed for 4 cards.
So I think that a perfect layout would be like an R3E, but with an extra 16x slot in the middle where the 4x is. That would be able to hold the following configurations:
4 double slot gfx cards
3 double slot gfx cards + sound card
3 triple slot gfx cards (like these phantoms)
2 triple / double slot gfx cards and a sound card (which is what I need)
So pretty much every config you could possibly put in it. And the two PCI-E molex power connectors ofc.