- May 29, 2013
- Asus Z370-G Gaming (Wi-Fi AC)
- i9-9900K OC'd @ 5.0GHz
- RX 6600 XT
- Classic Mac
- Mobile Phone
Scott, it does not seem to be a temp problem but maybe it's a a power issue?. If the card spikes to higher than supposed wattage, might this be the problem?. My PSU is a Corsair 650watts 80 Plus Gold.
Running Cinebench r23 with an OC of 46 the system remained stable at around 85º with all 12 cores running full power and no panics. The GPU is not used in this CPU render tests.
But I observed iStat menus reporting CPU power spikes of 250w! Is this a normal behaviour? I believed it could not go higher than 95w.
Pastrychef, take look at the very good Cinebench results in the attached image.
So, yesterday I spent all day testing without any OC.
The crashing happens inside Cinema with certain heavy scenes only when Octane starts rendering: all the cores start working at full power and at some point -I guess when the card stars to actually render- the system freezes. Sometimes glitches invade both monitors.
Then either the OS logs out of the user (some kind of soft reboot? New to Big Sur?) or a hard reboot happens with the machine restarting.
I believe there is something on that Cinema scene that makes Octane do something too demanding. Maybe too much geometry for the AMD with 16GB even the 1080 has no problem with it?
A previous version of Octane induced hard reboots via a bad RAM management in all kind of systems.
Anyway I have finally ordered a i9-9900K as OctaneX does solely rely on CPU for denoising (bummer), I'll benefit with the upgrade.
Should I also upgrade my 650w PSU?
Thank you and happy easter.
Once you start overclocking, the TDP ratings go out the window.
On my Vega 56 (BIOS flashed to Vega 64), when I was testing overclock stability, I regularly saw over 500W being drawn from the wall with heavy GPU loads. CPU load was medium.
I found my old Radeon VII to be much more power efficient. If my memory serves me correctly, I think total system draw maxed out at about 400W.
When running Cinebench r23, power draw from the wall tops out at 278W with my overclocked i9-9900K.
Technically, 650W should be enough, but, again, once you start overclocking, it's a completely different story.
85C for CPU is very good. 85C for GPU might be too hot.
If you are seeing graphical glitches on the screen, you may need need more cooling on the GPU. Don't keep stressing it until you address this.
One quick and easy way to improve GPU temps on Radeon VII is to improve mounting pressure of the heatsink. Please see article below. That guy used metal washers. I suggest using nylon washers. Also, when doing this, be careful not to tighten the screws too much for fear of damaging the GPU die. Just enough to squeeze the thermal pad a bit.
The time has come. We're finally allowed to talk about Radeon VII performance numbers. The company's new flagship graphics card is the world's first to be made using a 7 nanometer production process. Also, it has the largest VRAM size of any card below $1000: 16 GB.
On Vega 56/64, redoing the thermal paste can help a little. How much improvement you see from repasting depends on the heatsink. The heatsinks used with "reference" cards hit the limits of their cooling ability rather quickly and repasting really only helps during cool down periods. On my Vega 56 Red Dragon, which has a very large heatsink and three fans, good thermal paste helped a lot.