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NVIDIA claims that it has tdp of "250w" for gtx 480. However on my Kill-A-Watt, I can estimate that this card runs 250 on stock and 300+ with overclock. I've come to this conclusion because my computer idles at 150watt and running furmark ,it loads 450.on stock and 500+ with overclocked gpu.. ok well the whole system is working harder but I'm pretty sure gpu is running more than 300 watt here

So I've heard that PCI-e 2.0 x16 lane has 75watt, 6 pin has 75 and 8 pin has 150. Which means It will power 300 watt safely right?

Will there be a problem? my psu is antect signature 850 and I know it's a decent performing power supply. It hasn't given me any problems so far. This is more of a curiosity
 

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You should be fine, but I believe PCIE2.0 is 125W per lane, 75W iirc is for 1.0. So no, there shouldnt be an issue with powering the card at all. now if you toss another card in, you'll be cutting it close at full load, which is a rare occurance aside from stress testing.
 
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PCIE 1.0 = 75W + 6 pin = 75W + 8 pin = 150w = 300W Total. PCIE 2.0 = 150W and you can draw more power from the PCIE cables and even power a 500W GPU.
 
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Quote:

Originally Posted by kyle2194 View Post
Also consider the efficiency of your power supply, at 80% efficiency, 300w from the wall means only 260 is going to your card.
Goes the other way. If you're pulling 300W from the PSU you're pulling 375W from the wall.
 

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Quote:

Originally Posted by Phaedrus2129 View Post
Goes the other way. If you're pulling 300W from the PSU you're pulling 375W from the wall.
Those numbers are correct, but you are saying the same thing as me.

His kill-a-watt is measuring 300 watts ac power at the wall, that means his card is pulling 260 watts dc power from his power supply.
 

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Oh, I thought you were doing the whole '300W PSU can deliver 260W' shtick some adhere to.
 
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