If you use tdp in your decision to purchase a gpu you are stupid. It's not a mean thing it's just a fact.
If you want to know power consumption test it, don't guess.
Ya, but a lot of PC gamers are ignorant as to what TDP actually stands/means. TDP has never stood for real world power usage of NV/AMD GPUs. At best it's just a guidance for a cooling system/board's power. If you drop 2x8-pin power connectors on the card, might as well assign 375W TDP to it, and technically such a card can pull > 350w of power.
GTX680 = 192W TDP, real world power peak in games 186W
HD7970 = 250W TDP, real world power peak in games 189W
GTX580 = 244W TDP, real world power peak in games 229W
GTX480 = 250W TDP, real world power peak in games 272W
GTX970 supposedly has 145W TDP. Ya, good luck with that.
Conversely, R9 270X has a
TDP of 180W but in the real world peaks at 130W in games.
NV claims 90W TDP for the GTX950.
MSI Gaming 950 =
103W peak
EVGA 950 =
110W
Asus 950 =
103W
Gigabyte 950 =
105W
Zotac 950 =
133W (yes 133W)
TDP today is mostly just a marketing gimmick for GPUs. The only thing that matters is the real world power usage of the specific GPU you buy, as measured scientifically.
Usually online if you see someone state something stupid how a 950 uses 90W of power vs. 180W for an R9 270X and a GTX970 uses 145W of power vs. 290-300W for an R9 290, it tells you a lot about the person making these claims: (1) They are either ignorant about how real world power usage is actually measured (2) They are a ***boy trying to troll/make a point to exaggerate real power usage differences to crap on the competitor's product.
The most misleading stuff you'll online related to:
#1) People who use a reference card's power usage and use an after-market card's performance!
Like claiming 980Ti uses 240W of power and but adding 15-17% more performance vs. Fury X.
#2) People who use FurMark to claim real world power usage of a graphics card (in real world applications like games). When in reality, FurMark is just a power virus that loads up all the components on the board.
Gigabyte GTX980 =
342W peak
Gigabyte GTX980Ti =
359W peak
Since the Nano has an 8-pin connector and it can draw at least 75W from the PCIe slot, it can theoretically draw at least 225W of power in games.
What's crazy here is let's say the Nano draws 175-180W of power in games, well I already linked that a 925mhz HD7970 reference card drew 189W. So why in the world did AMD use these garbage reference blowers on HD5870/6970 and 7970 if the cooler fitted on the Nano can deal with 175-180W of power?
It's really said AMD has been that incompetent about reference cooler selection since September 2009.