07-07-2015, 07:40 AM
Then I'm afraid you do not know your history. I have a stack of burned motherboards and power supplies that were once running HD 6990s that says your doubts are seriously misplaced.
There's a reason why EVGA invented the "powerboost" PCIe power adapter mod, which prompted motherboard manufacturers to start adding supplemental power connectors to the PCI-e bus on high-end boards, and also why powered risers suddenly became very popular among bitcoin miners.
This was one of the first threads I read on this issue after experiencing a few meltdowns:
http://forums.evga.com/24pin-ATX-power-p...49507.aspx
So yes, AMD cards absolutely DO draw more than 75W from the PCI-e slots. And this is why Tyan and Supermicro say not to use GPUs that draw > 300W on their boards, because they do not have such supplemental power going to the PCI-e slots. 75+75+150 = 300W. If you use GPUs that draw > 300W, then you'll start burning up the board.
The exception for this is apparently the R9 295X2, which instead draws an absurd amount of power through the 8pin PCI-e power connectors:
http://www.computerbase.de/2014-04/amd-r...rk-test/2/
They measured 245-275W being pulled out of a 150W plug.
I'm honestly not sure which approach is worse, but the outcome is the same: we all need to start moving away from these cards!
There's a reason why EVGA invented the "powerboost" PCIe power adapter mod, which prompted motherboard manufacturers to start adding supplemental power connectors to the PCI-e bus on high-end boards, and also why powered risers suddenly became very popular among bitcoin miners.
This was one of the first threads I read on this issue after experiencing a few meltdowns:
http://forums.evga.com/24pin-ATX-power-p...49507.aspx
So yes, AMD cards absolutely DO draw more than 75W from the PCI-e slots. And this is why Tyan and Supermicro say not to use GPUs that draw > 300W on their boards, because they do not have such supplemental power going to the PCI-e slots. 75+75+150 = 300W. If you use GPUs that draw > 300W, then you'll start burning up the board.
The exception for this is apparently the R9 295X2, which instead draws an absurd amount of power through the 8pin PCI-e power connectors:
http://www.computerbase.de/2014-04/amd-r...rk-test/2/
They measured 245-275W being pulled out of a 150W plug.
I'm honestly not sure which approach is worse, but the outcome is the same: we all need to start moving away from these cards!