Did I mess up? 1000w psu

[gobstopp]

So I used the calculator over at outervision.

OuterVision PSU Calculator part list

Motherboard: Desktop
CPU: 1 x Intel Core i7-7700K
CPU Speed: 4750MHz
CPU Vcore: 1.2V
CPU Utilization: 90%
Memory: 4 x 8GB DDR4 Module
Video Card Set 1: 1 x NVIDIA GeForce GTX 1080 Ti
Core Clock: 2022MHz
Memory Clock: 1788MHz
Storage: 2 x M.2 SSD
Other Device: 2 x Fan Controller Device
Keyboard: 1 x Gaming Keyboard
Mouse: 1 x Gaming Mouse
Fan: 10 x 120mm
Fan: 4 x 120mm
Liquid Cooling Pump: 1 x EKWB EK-DDC 3.2
Computer Utilization: 8 hours per day
Gaming/Video Editing/3D Rendering Time: 8 hours per day

Load Wattage: 601W
Recommended Wattage: 651W
Amperage: +3.3V: 13.1A, +5V: 12.5A, +12V: 45.4A
Recommended UPS Rating: 1100VA
Generated by OuterVision PSU Calculator 2017-07-27 01:46:16

Now at the bottom it recommended a 1000w evga, which I bought. Don't mind spending the money on something nice, just don't want to screw myself. This isn't my current system, I plan on adding 8 more fans and 2 fan controllers in a few months, but minus those fans and fan controller this is my current system. If I put my current system in the calculator it suggest's an 850w power supply. Near Christmas I might even be adding some led strips and a 2nd water pump, so I don't mind having a little headroom.

So I don't mind spending extra for more headroom, my concern is when my pc is idle in its current state (only 6 fans, no fan controller) would my pc be drawing such a low wattage that it might be unsafe? Some people mentioned issues when drawing low wattage on high watt psu's.

 

[E4g1e]

So I used the calculator over at outervision.

OuterVision PSU Calculator part list

Motherboard: Desktop
CPU: 1 x Intel Core i7-7700K
CPU Speed: 4750MHz
CPU Vcore: 1.2V
CPU Utilization: 90%
Memory: 4 x 8GB DDR4 Module
Video Card Set 1: 1 x NVIDIA GeForce GTX 1080 Ti
Core Clock: 2022MHz
Memory Clock: 1788MHz
Storage: 2 x M.2 SSD
Other Device: 2 x Fan Controller Device
Keyboard: 1 x Gaming Keyboard
Mouse: 1 x Gaming Mouse
Fan: 10 x 120mm
Fan: 4 x 120mm
Liquid Cooling Pump: 1 x EKWB EK-DDC 3.2
Computer Utilization: 8 hours per day
Gaming/Video Editing/3D Rendering Time: 8 hours per day

Load Wattage: 601W
Recommended Wattage: 651W
Amperage: +3.3V: 13.1A, +5V: 12.5A, +12V: 45.4A
Recommended UPS Rating: 1100VA
Generated by OuterVision PSU Calculator 2017-07-27 01:46:16

Now at the bottom it recommended a 1000w evga, which I bought. Don't mind spending the money on something nice, just don't want to screw myself. This isn't my current system, I plan on adding 8 more fans and 2 fan controllers in a few months, but minus those fans and fan controller this is my current system. If I put my current system in the calculator it suggest's an 850w power supply. Near Christmas I might even be adding some led strips and a 2nd water pump, so I don't mind having a little headroom.

So I don't mind spending extra for more headroom, my concern is when my pc is idle in its current state (only 6 fans, no fan controller) would my pc be drawing such a low wattage that it might be unsafe? Some people mentioned issues when drawing low wattage on high watt psu's.

Here's the deal with using a seriously overpowered PSU:

Your system will be idling at significantly less than 20%. And your system will be spending most of the time at or near idle. And power supplies are less efficient at less than 20% utilization than above 20%. This means that your system might end using a bit more electricity at the wall than it would have with a somewhat lower wattage PSU.

 

[Bandalo]

Here's the deal with using a seriously overpowered PSU:

Your system will be idling at significantly less than 20%. And your system will be spending most of the time at or near idle. And power supplies are less efficient at less than 20% utilization than above 20%. This means that your system might end using a bit more electricity at the wall than it would have with a somewhat lower wattage PSU.

Essentially this. It largely depends on the efficiency curve for that particular power supply. Some are better than others at low load.

 

[gobstopp]

So at idle it will lose some efficiency but otherwise it would cause no harm? I went with an evga 1000w titanium. I was going to go with the 850w but it was out of stock at the time. I can still return the 1000w and wait on an 850w, I just liked the idea of having headroom in case i wanted to expand. Currently having to upgrade my psu because last time I cheaped out, dont want to repeat that mistake.

 

[Deleted member 88227]

Yeah you'll just lose some efficiency. Nothing to be concerned with.

 

[Bandalo]

So at idle it will lose some efficiency but otherwise it would cause no harm? I went with an evga 1000w titanium. I was going to go with the 850w but it was out of stock at the time. I can still return the 1000w and wait on an 850w, I just liked the idea of having headroom in case i wanted to expand. Currently having to upgrade my psu because last time I cheaped out, dont want to repeat that mistake.

So check this out:

That's for a similar power supply, but you get the idea. In the "operating range", say 200-600W, you're around 90% efficient, so it's all the same between a high and lower power PSU.

Now, at idle is when you get into the "problem" area:

Say your system is 50W at idle, by this curve you're running at ~80% efficiency. That means the system pulls 62.5W from the wall, 50W is used by the computer, and 12.5W is wasted as heat in the PSU.

Lets say you got a different, smaller PSU that was 90% efficient in the 50W range. That means you'd only pull ~55W from the wall for your 50W system, wasting only 5W as heat in the PSU.

So TECHNICALLY it's better to get a properly sized power supply. In practice though, it makes very little difference in the long run.

 

[Tsumi]

Other than wasting money upfront and losing efficiency while idling, nothing wrong with a grossly oversized PSU.

BTW, your system really only needs 650 watts at most. Your actual load wattage will most likely be in the 500 watt range.