brought from other thread...
| Netyaroze said:
7850 has 130 Watt BOARD POWER. "AMD advertises the board power at 130W (7850) and 175W (7870), board power is different then the TDP. If you try and visualize the power control settings slider in the Catalyst center, then you'll realize that you can increase it 20% meaning at default the TDP is roughly 20% lower then AMD's 130W for the 7850 and 175W for the 7870." So 20% from 130 Watt is 100 Watt TDP. Thats the stock TDP of the 7850. The board allows you to go higher if you want to. So yes the7850 has a possible max TDP of 130 Watt. Meaning the Card is designed to cool the GPU if you run it at the max. Take the GPU redesign Card/Cooling and it maxes out at 200 Watt TDP. Now the 7970m has usually not a TDP of 75 but 100 Watt. But It CAN Have a TDP of 75 Watt and what it actually has depends on the engineer designing the Notebook which is not AMD. You are wondering right now why there are so many different numbers on the net, if you have googled it. Well see TDP is variable it depends on the clocks and the strength of the cooling system/power supply. If you "overclock" a 7970m to 1 GHZ the TDP will be 175 Watt and you will have a 7870 GHZ Edition in your Notebook. See a Notebook clocks a certain chip higher or lower depending on the battery. If you have a huge strong one you can have the GPU running higher power. Well a PS4 can use Powerlines so they will not use low power because it makes no sense. (Unless your name is Nintendo). Low Power wafers are the ones with 30 Watt 10 Watt. A Gefore Titan Can be considered a mobile GPU if you carry a backpack with Hydrogencells around. Its really die size and Transistor count that determins how big a GPU is not TDP. And the PS4 GPU is bigger and can far exceed the power of a Desktop 7850. Where does low Power begin for you ? Desktop ranges from 20 Watt (7350) to 375+ Watt (7990) max TDP. "The TDP is reference design TDP values from AMD. Different non-reference board designs from vendors may lead to slight variations in actual TDP." The TDP tells people how much Temperature can be transported safely away without the GPU overheating. You can freeze a GPU to absolute Zero and make it a Superconductor and feed a it insane amounts of Watt. You can do it with a mobile GPU aswell as Desktop GPU. So low Power is determined on how much Power a certain chip gets and where do you think low power starts what are the criteria ? You have no idea how much watts a PS4 GPU will need but I can tell you with 1.84 Tflop its highest end mobile TDP and Midrange Desktop TDP. The GPU itself is bigger than a 7850 so please define how the PS4 GPU is low power, low cost, mobile GPU ? Is everything not high end low power to you ? Do you think PS4 can run on a Laptop battery ? |
Hmm. Everything I've read always stated "max" TDP, which is what I was comparing.
As for "bigger" than and so forth... how do you know the PS4 GPU is bigger than 7850? What are you basing that on? AFAIK we don't have actual hardware to measure the size. OR are you just comparing TFLOPs or something?
My logic in this is pretty simple I think.
All AMD APUs have low-power solutions.
PS4 has a AMD APU that will also be a retial unit at some point.
PS4 APU is more than likely to have a low-power solution.
AMDs cards that are low-power that fit PS4s stated features is the 7970M.
