CYBERPUNK 2077 [PC Specific Patches and Settings]
- Thread starter Malo
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davis.anthony
Veteran
I've not run any tests but I would imagine it's less CPU work as it unifies the RT passes in to a single one?
It was touched upon in the latest DF Direct. Alex referenced a CDPR talk that suggested they would be using the same BVH and so in theory it shouldn't impact the CPU too much but he was considering testing it.
Anecdotally, using MSI Afterburner's performance charting tool during my offhand tests above, the CPU consumption on my 5950x wasn't notably different in the Pathtracing benchmark vs my "regular" Psycho settings.
Edit: Changed the word to "different" rather than "higher", which is a more accurate portrayal of my impression of CPU consumption change.
Edit: Changed the word to "different" rather than "higher", which is a more accurate portrayal of my impression of CPU consumption change.
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It traced a path straight to your weaksauce PSU 
Kidding of course, Seasonic is a quality PSU and I'm surprised it choked. Is it fairly old?
Kidding of course, Seasonic is a quality PSU and I'm surprised it choked. Is it fairly old?
It's 6 years old
I'm surprised. Normally 760 W should be sufficient for these components.
Before 1.62 I also wondered if path tracing would require even faster CPUs.
The number is definitely big enough. I'm running a 5800X and 3090 on a 10 year old Corsair 750W PSU. Had a 5950X before the 5800X and that was fine too.
I thought it should be big enough as well. It's only ever happened running Cyberpunk at 4k rarely, and in RDR2 in 4k, on my TV.
Running even on my 2560x1080 monitor, Overdrive makes it die immediately. Turn off overdrive and it's ok. So it seems like when it's really pushing the GPU to it's limits in games.
Note that I can do 3D rendering on the GPU maxing it out for hours and it's fine.
DavidGraham
Veteran
RTX 3000 and RX 6000 GPUs can experience massive very brief power spikes that are two times the TDP of the GPU or more, this can shut down old PSUs pretty fast. The frequency of the spikes is directly proportional to how heavy the load is, and how variable it is, the more it alternates between a very light workload (such as a game menu) and a heavy work load (such as path tracing), the more it happens.
I think it also happen when unplugging external displays. As the fan will freak out for a few sec.
My pc also sometimes totally crashed when I discunnected 2 external displays AT THE SAME TIME.
But never crash it I disconnected one by one.
Edit found this
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DavidGraham
Veteran
Yes, RTX 2000 cards also suffered from this, but to a lesser degree (even high end Pascal/GTX 1080Ti suffered from it), my 2080TI busted two high quality PSUs the same way, spikes, PSU shuts down, repeats enough times till the PSU is finished.
With RTX 3000/RX 6000, you need a very high quality PSU to avoid this issue and to avoid damaging your PSU, or you can reduce the power target of the GPU/undervolt slightly to mitigate it a little.
Both NVIDIA and AMD reduced this issue massively in their new generation (RTX 4000/RX 7000), as these cards don't spike as hard, or as often, and the new ATX3 PSUs basically ended this issue, as the ATX3 standard can handle spikes that are 3x the output of the whole PSU.
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davis.anthony
Veteran
That's a tiny PSU for a 3090 when you factor in transient power spikes.
The recommended PSU for a 4070ti is 850w and that draws substantially less power than a 3090.
The recommended PSU for a 4070ti is 850w and that draws substantially less power than a 3090.
PSU designs already account for spikes. A “quality” PSU can handle transient spikes far above the rating on the box.
davis.anthony
Veteran
But not for spikes as high or as frequent as the 3090 can create them.
Techpowerups 3090 review found that it needs an 800w PSU minimum.
Running a PSU that's under spec (Quality or not) is always going to cause issues as you're running the PSU at max load.
I personally always go +20% of what I need.
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Silent_Buddha
Legend
Nice to see that my new 6800 positively sips power compared to the other cards in that graph.
Regards,
SB
Damn, that 3090 graph is nuts. A nearly 1KW burst consumption is a crazy amount of power.
Probably yet another reason why undervolting can be so successful in a lot of these enormously power hungry cards. My EVGA 3080Ti FTW card performs measurably faster and far more consistently with a hefty undervolt versus "stock" voltage. It's crazy how much power and heat these things chew through, even to their own detriment.
Probably yet another reason why undervolting can be so successful in a lot of these enormously power hungry cards. My EVGA 3080Ti FTW card performs measurably faster and far more consistently with a hefty undervolt versus "stock" voltage. It's crazy how much power and heat these things chew through, even to their own detriment.
Silent_Buddha
Legend
Yup, if peak transient power consumption isn't reined in, I could see it eventually getting to the point where you'll trip the 15 amp fuse for standard power outlets in the US, Japan and other countries that use 100/110 volt outlets.
Regards,
SB
If I set my 3090 to max 50% power, it gets through the benchmark without issue. HWINFO shows around 220w power usage. Setting it to 75% it dies before even the first frame of the benchmark shows, the logs peak at 316w though HWINFO doesn't poll nearly enough to detect big spikes of course.
I might contact Seasonic to see if they think there's an issue, it has a year warranty left on it. Otherwise I guess I'll be moving up to 1000w or something. Their wattage calculator gives a minimum of 850w for my config.
I might contact Seasonic to see if they think there's an issue, it has a year warranty left on it. Otherwise I guess I'll be moving up to 1000w or something. Their wattage calculator gives a minimum of 850w for my config.
