Question PSU versus estimated PD ?

[felberino]

Hello everyone. Here is a link to my current build: https://pcpartpicker.com/list/JmVGRV Will I run into issues with my PSU? I've already built the rig and the 5080 is brand new, everything else about a month and a half old. Impulse bought the 5080 a week ago and started questioning my PSU after I bought the new card. Is this sufficient? Should I absolutely re-upgrade my PSU again? I also have some GPU and MB strimmers as well. This link says the estimated usage is around 800W. Only overclocking I've done is XMP in BIOS, if this is considered overclocking? I'm not too familiar with overclocking and undervolting so probably won't take a stab at it either. Any thoughts/suggestions/tips would be greatly appreciated, although I do not want to buy a new PSU if I DO NOT have to.

 

[Ralston18]

Start here:

https://www.tomshardware.com/reviews/best-psus,4229.html

Then look in Jump to > "Shopping Tips" for the calculators that can be used to estimate power demands.

Worth noting (from the link):

"While PSU calculators are useful, they rely on thermal design power (TDP), which often overestimates real-world power needs. Considering that the unit should operate at roughly half capacity, choosing a PSU based on these recommendations is not wrong; however, many users mistakenly opt for much higher wattages, leading to oversized, expensive units that cannot perform optimally."

Apply 2 or 3 of the calculators and then do your own manual total.

If a component provides a range of wattages - use the high end value.

 

[felberino]

Start here:

https://www.tomshardware.com/reviews/best-psus,4229.html

Then look in Jump to > "Shopping Tips" for the calculators that can be used to estimate power demands.

Worth noting (from the link):

"While PSU calculators are useful, they rely on thermal design power (TDP), which often overestimates real-world power needs. Considering that the unit should operate at roughly half capacity, choosing a PSU based on these recommendations is not wrong; however, many users mistakenly opt for much higher wattages, leading to oversized, expensive units that cannot perform optimally."

Apply 2 or 3 of the calculators and then do your own manual total.

If a component provides a range of wattages - use the high end value.

Thanks. One said 700-799, another said 750 and another said like 625. I have 850W Gold+ right now. What are your thoughts? Also my manual calculation is 799, using the high end per the parts on pc part picker. Think I'm good? Even if I decide to O/C?

 

[Ralston18]

Overall, my thought would be a good quality (and likely higher cost) 1,000 Watt PSU.

Simply to add some wattage margin to account for uncertainties and future growth.

PSU manufacturers tend towards claiming the highest wattage that can be obtained on paper and/or ideal situations.

Component manufacturers tend towards claiming the lowest consumed wattage that can be obtain on paper or ideal conditions.

My rule of thumb is to tally up the wattages and add 25% more. Which can be and has been deemed (fairly) as too much. However, better too much wattage rather than too little. And PSUs will only provide the necessary wattage being demanded by the host system at any given time.

Not an overclocker (full disclosure) so I will defer to those members who do overclock and to how they determine or adjust the applicable PSU wattage.

 

[Misgar]

The RTX5080 draws up to 300W (I'm ignoring short duration transients).
https://www.tomshardware.com/pc-components/gpus/nvidia-geforce-rtx-5080-review/8

This link shows RTX 5080 TDP max 360W.
https://www.techpowerup.com/gpu-specs/geforce-rtx-5080.c4217


The 14700K (stock) could pull up to 279W.
https://www.techpowerup.com/review/intel-core-i7-14700k/22.html

Outside of stress testing, you're unlikely to exceed these figures unless you overclock the GPU or CPU.

Only overclocking I've done is XMP in BIOS, if this is considered overclocking?

Yes XMP is overclocking, but it won't make a significant difference in power consumption.

If you've already purchased the PSU, try it out in the new system. Connect a Kill A Watt meter to the ATX PSU and monitor the power draw. I doubt you'll see more than 600W in games or render apps. Stress testing is a different matter, but I only run such tests long enough to check stability, if I'm overclocking the CPU or GPU.

Some PSU reviewers apply a 110% load to check temperature stability. In many cases, a good quality PSU will run quite happily up to 115% before tripping. If the trip levels are set too loose, it might not trip till 125% (25% overload).

Conversely, really bad PSUs may stop working at 50% rated power ($20 junk).

Higher power GPUs (5080 and especially 5090) can be demanding of PSUs as regards transient (milliecond) current spikes of 2x normal level. If your PSU has electrolytics with good capacity reserves and high current MOSFETs, you should survive such short term spikes.

If you do experience transient problems, you may have to upgrade your PSU. Use the latest NVidia drivers and the latest mobo BIOS.