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So... I still don't understand how the R9 295x2 gets enough power?

Izaya Orihara
By Izaya Orihara
in Graphics Cards
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Posted

It's 75 Watts from the PCIe Slot and 300 Watts from the two 8 Pin connectors. That is 375. How can the tdp be 500 Watts? Where are these 125 watts coming from? 

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Posted

the pump works as a generator? :P

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More power can be pulled from the connectors than specified. Higher end psus generally have no issue doing so with beefy rails.

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There is also inefficiency, to be taken into account.

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More power can be pulled from the connectors than specified. Higher end psus generally have no issue doing so with beefy rails.

This. Its breaking the atx specs for the connector, but as long as you have a good psu, it will work.

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There are cards that are not PCI-E certified as they pull more then 75 W from PCI-E slot. There are PSUs that can supply 30+ Apms on 12V rail so it more then enough.

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There is also inefficiency, to be taken into account.

Inefficiency would require it to draw more power; one cant generate 500w of heat without at least 500w of energy being put in.

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Inefficiency would require it to draw more power; one cant generate 500w of heat without at least 500w of energy being put in

 

 

There is some inefficiency before it reaches the core. Gnerally during the voltage conversion at the PSU. Maybe small/minor but it's a factor they take into account and they are quite conservative about it. 

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It's 75 Watts from the PCIe Slot and 300 Watts from the two 8 Pin connectors. That is 375. How can the tdp be 500 Watts? Where are these 125 watts coming from? 

Because them rules comply with pcie standards, AMD have not. The extra power comes from the psu delivering more amps

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1000watt FTW!

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