Just need to ask yourself
Is the price difference worth the benefit in a realistic upgrade scenario?

If you are planning to overclock and upgrade, 1000w does give more headroom than 850w

引用自 ArielNugie：

Just need to ask yourself
Is the price difference worth the benefit in a realistic upgrade scenario?

If you are planning to overclock and upgrade, 1000w does give more headroom than 850w

It all depends on the assumption that future hardware is going to require more power instead of becoming more efficient.
I'd say 850 is enough and he should be using his PSU at max peak efficiency.

@Arbiter of mediocrity , do you know what efficiency curves look like ?

引用自 smallcat：

@Arbiter of mediocrity , do you know what efficiency curves look like ?

I do but does your question help this discussion?

引用自 Arbiter of mediocrity：

引用自 smallcat：

@Arbiter of mediocrity , do you know what efficiency curves look like ?

I do but does your question help this discussion?

Depending on the hardware he could go past the best efficiency with 850W .if this matters .i mean your argument is dropped .

引用自 smallcat：

引用自 Arbiter of mediocrity：

I do but does your question help this discussion?

Depending on the hardware he could go past the best efficiency with 850W .if this matters .i mean your argument is dropped .

Steam forums... Depending on his hardware he could get past the efficiency curve of 1000W too.

@Arbiter of mediocrity , your argument is that he should pursue the peak efficiency . for me it s not that important since the PSUs ratings are already known . for me the noise could be a concern

9800x3d power draw while gaming around 100 watt, rx 9070 xt power draw while gaming around 350 watt, lets guess the rest of the system (mainboard ram nvme drives etc) uses 100 watt so we are at 550 watt. Most powersupplys have their best efficency around 50% of max load.
So for the 850w unit around 425w and for the 1000w unit around 500w.

The 850 watt power supply will do fine, but if you want to oc or you want to get even hungrier hardware in future get the 1000w unit. The 1000 watt unit is also a bit more efficent better for the power consumption of your system while gmaing.

edit: correkt a mistake the rx 9070 draws 250 watt while gaming, the rx 9070 xt 350watt

some factory OCed RX 9070XT could hit 350W

引用自 smallcat：

some factory OCed RX 9070XT could hit 350W

Thanks but i have noticed it myself and already corrected.

Both PSUs have Zero Fan mode
review
https://hwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-review/

9800x3d can draw 162w
9070xt 304w, maybe more oc'd
mobo, ram, fans, drives add 100w
add 100w for overhead

total = 666w
add 20% to keep the psu in a better efficiency range (666*1.2) = 799w

850w is more than enough for the build

amd says min recommended psu is 750w,
which would be about right for a lower end cpu around ~60-80w max
and they gotta cover for overrated junk psus

引用自 _I_：

9800x3d can draw 162w
9070xt 304w, maybe more oc'd
mobo, ram, fans, drives add 100w
add 100w for overhead

total = 666w
add 20% to keep the psu in a better efficiency range (666*1.2) = 799w

850w is more than enough for the build

amd says min recommended psu is 750w,
which would be about right for a lower end cpu around ~60-80w max
and they gotta cover for overrated junk psus

I know 850w is more than enough for the 9800X3D and RX 9070XT. Just wondering if bumping up to 1000w to be futureproofed for newer GPUs in a few years time is worthwhile.

引用自 BeamLT：

引用自 _I_：

9800x3d can draw 162w
9070xt 304w, maybe more oc'd
mobo, ram, fans, drives add 100w
add 100w for overhead

total = 666w
add 20% to keep the psu in a better efficiency range (666*1.2) = 799w

850w is more than enough for the build

amd says min recommended psu is 750w,
which would be about right for a lower end cpu around ~60-80w max
and they gotta cover for overrated junk psus

I know 850w is more than enough for the 9800X3D and RX 9070XT. Just wondering if bumping up to 1000w to be futureproofed for newer GPUs in a few years time is worthwhile.

Nobody knows if the trend of more powerhungry gpus and cpus will continue, but my guess is that it will continue to rise at the high end hardware, even if cables are already melting ^^. So if you wanna have some headroom get the 1000watt unit. And with your current hardware the 1000watt unit you maybe able to save a buck at your powerbill in the longrun because its more efficient at your load than the 850watt unit. So depending on electricity price it may be worth to spend the extra 30 bucks. For Futureproofing let me tell you that for example a rtx 5090 can suck up to 600 watt and will need at minimum a 1000watt unit.

Both will be fine but if you can afford a 1000W grab one, why? Because why not?