Building a PC. I was going to go with a 1000W Psu but psu calculator says otherwise.. how trustworthy are they?

flashheart85

flashheart85

flashheart85

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Hi there.

I am building a PC. I was going to go for a 1Kw PSU as the PSU was on sale for the same price as a 850W (and i thought it gives me a bit of headroom) However, that PSU is now out of stock for that price. SO, i headed to a PSU calculator and it says the 850W would be more than enough for my needs... How accurate are they?

Here is my setup:
I don't currently have a 4080 (I have a 2070) but i plan to upgrade next year/to a 5080.

[td]
CPU
AMD Ryzen 7 7800X3D

Motherboard:
Asrock X670E Pro RS

RAM
CORSAIR VENGEANCE RGB 32GB DDR5 6000Mhz RAM

SSD
2

HHD x4
GPU Currently have a 2070 but plan on upgrading to a 4080/5070 next year.

Standalone Soundcard

According to the PSU calculator 620W is fine so a 850W is perfect.. Is this correct?
I don't really plan on overclocking the GPU but may try and push a bit more out the CPU for ***** and giggles but its not a deal breaker
Ill have about 5-6 fans and a All in one rad cooler for the CPU.

how accurate are these calculators? Ive seen some say they;re okay if you allow a bit of headroom while others say they're utterly useless.
 
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You can easily run that on a 850W PSU - I've got a 14700K with 32GB RAM and 4080 Super on a Be Quiet! Dark Power 13 850Watt. The rumours are the 5080 will be around 400 watt rated though so might be cutting it a little fine on a 800-850 watt PSU but should still be fine.
 
7800X3D uses less than 100 watts when gaming (average of 49 in TPU's review) and 2070 around 200, so there's no problem with what you have.

If the 5080 uses 400 watts as the leak suggests, I'd get the 1000 just to account for power spikes, since even though ATX 3.x PSUs are supposed to deal with those it seems prudent given the relatively small cost of 1000 versus 850 relative to the purchase price of a 5080.
 
Tetras said:
7800X3D uses less than 100 watts when gaming (average of 49 in TPU's review) and 2070 around 200, so there's no problem with what you have.

If the 5080 uses 400 watts as the leak suggests, I'd get the 1000 just to account for power spikes, since even though ATX 3.x PSUs are supposed to deal with those it seems prudent given the relatively small cost of 1000 versus 850 relative to the purchase price of a 5080.
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Sorry, my mistake. Ill edit this. It'll be either 4080 or a 5070* (Maybe a 5080 if the price is similar to 4080 which leaks suggest it'll be quite a bit more sadly)
 
Overspeccing the PSU is like money in the bank imo especially long term giving you the ability future upgrades .

A good PSU will have a 10 year warranty and hopefully then you won't need to change it.

GPUs are getting more power hungry and that trend isn't going to stop .
 
A good quality 850W is plenty, by the look of things however going by early unconfirmed reports of NV's 5000 series GPU wattages are continuing to rise.

I'd go with a 1000W now, in fact my current set up is comfortable powered by my Seasonic 750W, but I would definitely not buy less than a 1000W going forward.
 
I went with an over specced 1200 watt psu mainly due to thinking the fan on it will stay stopped till a higher wattage then the 1000 watt version of it.

As it normally the fans on my PSU's that fail first or get loud after so many years
 
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chaparral said:
I went with an over specced 1200 watt psu
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I have a 1000w phanteks amp (some seasonic rebanreded psu I think) thats a few years old now.

The psu fan is so quiet I had to hold a rizzla paper against the back of it to see in which button position the fan was always on.
I've never noticed it make a sound and can never feel the air with my hand
 
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arknor said:
I have a 1000w phanteks amp (some seasonic rebanreded psu I think) thats a few years old now.

The psu fan is so quiet I had to hold a rizzla paper against the back of it to see in which button position the fan was always on.
I've never noticed it make a sound and can never feel the air with my hand
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My problem not fan noise, it the fans on PSU’s have always failed before the PSU fails

And it normally far from is easy to buy the exact same fan with the same wire connector

Also the less the PSU fan spins the less dust you get in the PSU ;)
 
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