Processor advice

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cp_rosser

Member
Hi,

I primarily use Blender and I've noticed recently that when rendering my CPU maxes out at 100% causing stuttering, my mouse jumps and sound intermittently cuts out. Whilst it's not a game-changer it is frustrating, and I'd like to remedy it. Before I attempt to throw money at the problem is there something I should/could be doing? My rig is below:

Case
CORSAIR iCUE 465X RGB GAMING CASE
Processor (CPU)
AMD Ryzen 7 3800XT Eight Core CPU (4.7GHz/36MB CACHE/AM4)
Motherboard
ASUS® TUF GAMING B550-PLUS (AM4, DDR4, PCIe 4.0)
Memory (RAM)
32GB Corsair VENGEANCE DDR4 3200MHz (2 x 16GB)
Graphics Card
12gb Nvidia 4070ti (recent upgrade)
1st M.2 SSD Drive
512GB PCS PCIe M.2 SSD (2200 MB/R, 1500 MB/W)
1st Storage Drive
2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 256MB CACHE
Power Supply
CORSAIR 850W RMx SERIES™ MODULAR 80 PLUS® GOLD, ULTRA QUIET
Power Cable
1 x 1.5 Metre UK Power Cable (Kettle Lead)
Processor Cooling
CORSAIR H100i RGB PLATINUM Hydro Series High Performance CPU Cooler
Thermal Paste
STANDARD THERMAL PASTE FOR SUFFICIENT COOLING

System is up to date and running latest Nvidia drivers 566.36.

Thank you in advance for any help
 
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TonyCarter

VALUED CONTRIBUTOR
Are you rendering whilst trying to do other things? If so you may want to limit the number of cores used by your rendering so that there's free cores for everything else.

But 100% usage is really what you want to see if you want all the performance out of the CPU.

The only other thing I can think of is if the SSD/HDD are busy with something else in the queue and can't keep up? How full are both of these?
 
C

cp_rosser

Member
Hi Tony, thank you for replying so quickly.

The only other apps I have open is Edge which seems to generally be a hungry browser, and Spotify which is where I notice the sound stuttering.

I've attached a gif of the processes during the render. You can see that the GPU spikes to begin with and then drops right off and the CPU then takes over. It seems to be most affected towards the end of the render which (I assume) is when Blender is denoising the scene.
 

Attachments

  • Peformance.gif
    Peformance.gif
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TonyCarter

VALUED CONTRIBUTOR
Does it do the same if Edge and Spotify are closed?

Any other program will have to share resources with the renderer, so I'm not surprised there's some ups & downs in the usage panel. But if it's not affecting the output, then it's either a matter of living with it, or quitting all background apps until your render has finished.
 
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cp_rosser

Member
I've just tested with Edge open but a different Blender file where I've pasted in the geometry, and no jittering or hang ups. I'll interrogate the files to see what is different in each and try and find an answer.

Living with it seems to be the sensible approach, I suppose I was somewhat worried that something on my PC was on the way out.
Separately, could I upgrade the CPU, and if I did would it help?
 
T

TonyCarter

VALUED CONTRIBUTOR
cp_rosser said:
Living with it seems to be the sensible approach, I suppose I was somewhat worried that something on my PC was on the way out.
Separately, could I upgrade the CPU, and if I did would it help?
Click to expand...
Without knowing whether it was the CPU or the files, it's pointless to replace anything.

But yes, that platform (AM4) with the correct BIOS update would support upto a 16-core 5950X (which is about £300)...although I don't know if PCS also offer it as part of their upgrade service (but my old AM4 order only shows AM5 upgrades...which are physically impossible to fit)...
 
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