Power Consumption for the Nvidia Geforce 945M?

Hi everybody,

I can't find anywhere on the internet official specifications for the Nvidia GeForce 945M. I want to know the TDP of the chip.
According to a website, it "should be" "around" 40 watts
Another website claims a 70W TDP, which I know is false, since my laptop is rated for 90W.


Help?

 

https://www.techpowerup.com/gpudb/2836/geforce-945m

 

Thank you, but do you knw where TechPowerUp sources this information? If the graphics card only used 23 watts, then a 65 watt power adapter would do

GPU 23W
CPU 15W
RAM 2W
HDD 2W
Screen 10W

That leaves about 10 watts left over.

This was the similar with my older laptop, exact specs but with the older 33W GeForce 840M, and it managed with a 65W power adapter.

 

Speaking of which the 940M is rated for up to 33W, shouldn't that be the same with the 945M, which has significantly higher performance? THey are based on the same processor GM108

 

you seem to have forgotten charging your battery

Just remember that tdp and consumption measure different things. Tdp measures heat output actual consumption will be higher

There are also losses when converting from source voltage to the various working voltages

 

For a computer processor all power consumption becomes heat.

The TDP, or thermal "desgin" power is only a guide line. The actual platform will always leave some head room. Any cooling device will also have some thermal capacity, which means you can go beyond the targeted power limit for a short time while starting from a relatively cold state, but once the temperature goes up you have to throttle down.


A laptop can have a global power limit and throttle one component if another is under load.

 

Okie, thanks your your help

 

90W seems about right for your adapter. Don't forget the motherboard needs power as well. And of course all the possible USB devices connected to it as well as wireless adapters, bluetooth, etc.. They all need power so manufacturers may provide power supplies with a bit of headroom for all possible scenarios for that model.

Also, power adapters for laptops tend to be a lot more efficient than most desktop power supplies, so a more powerful adapter than you need will not necessarily mean much power lost as heat.