Connecting GTX 750ti to Laptop externally

[elmenhorster]

Hi everybody,

I have external PCIe slot ready. I just wanted to know if GTX 750ti will require a separate PSU or will I get away with a basic power cord. The reason I ask is, because TDP of this graphics card is only 60w.

 

[drkatz42]

Can you elaborate on your hardware?

 

[mcnumpty23]

never tried but this guy is using a psu for 750ti

http://www.pcworld.com/article/2984716/laptop-computers/how-to-transform-your-laptop-into-a-gaming-powerhouse-with-an-external-graphics-card.html?page=2

 

[Low Profile Gamer]

You might need a PSU for that, because not all laptop PCIe slots can deliver 75w of power. They're just not designed to be that way.

 

[elmenhorster]

Interesting article. Although he's using overclocked with two fans.

It also states the following: "Alternatively, you may only need a power brick similar to what powers your laptop. Take Nvidia’s GTX 650 Ti graphics card, which requires 110 watts of power, according to Nvidia’s specs. Nando advises that your PSU needs about 15 percent more power than the card (not the system) requires, meaning a 110 Watt card needs a PSU with a minimum of 127 Watts."

That means if GTX 750ti is 60w. Then I only need power "brick" (90w output) similar to what powers my laptop. Why do I need a PSU overkill?

 

[simon12]

You need a PSU as your laptop is no designed to draw likely nearly double the power it uses through its circuitry to power a GPU.

 

[elmenhorster]

Can you elaborate on your hardware?

You need a PSU as your laptop is no designed to draw likely nearly double the power it uses through its circuitry to power a GPU.

I talking about two power cords: one for laptop and other for eGPU.
I've found the answer https://www.youtube.com/watch?v=EpOPSoXt32E
This guy uses AC adapter, if it was over 220w I'd need PSU.
Thanks for help everyone. Case closed.

 

[mcnumpty23]

personally i would rather use a psu than a power brick a psu is more likely to out last a power brick for continuous use for one thing

 

[Low Profile Gamer]

+1 for mcnumpty23. I'd rather use a PSU too. There are lots of good quality inexpensive PSUs to power that up. Power bricks heat up a lot too. I get electric shocks when touching my two year old laptop's power brick.

 

[mcnumpty23]

+1 for mcnumpty23. I'd rather use a PSU too. There are lots of good quality inexpensive PSUs to power that up. Power bricks heat up a lot too. I get electric shocks when touching my two year old laptop's power brick.

thanks

and yes a psu is also better designed to deal with the heat produced

but you shouldnt get electric shocks from a laptop charger thats not right