i9+Vega Vs i9+580x (Temps and Fan Noise)

[topgunn]

Did a couple of quick tests. When running X-Plane 10, I was getting 70 FPS with the settings that got me 35 FPS on my Late 2013 iMac. My i9 was running at 4.7 Ghz with it open. 90 C on the i9 which then caused the fan to ramp up. I saw 79 C from the Vega 48.

Running the yes command, 1-3 cores saw a 4.7 Ghz speed. With each more core loaded saw a 100 Mhz drop. With 8 cores running at 4.2 Ghz. Now this was only 50% load technically I stopped at 8 yes commands and not 16.

Running Cinebench... Letting it use all 16 threads, it ran between 3.8-3.9 Ghz. Saw 4 Ghz once, but didn't touch it often. Doing another run limiting it to 1 thread saw a speed of 4.7-4.8 Ghz.

Idle temps are 40 C for the i9 and 33 C for the Vega 48.

How would compare the fan noise on your new iMac to the 2013? Under load? How quickly the fans become audible?

Thank.

 

[quagmire]

How would compare the fan noise on your new iMac to the 2013? Under load? How quickly the fans become audible?

Thank.

I always set the fan to full when I was going to do any intensive work, but I would say the noise level is about the same.

 

[jeremiah256]

I always set the fan to full when I was going to do any intensive work, but I would say the noise level is about the same.

Admittedly off-topic, but why is CV-6 a crime against US History? The other two I understand by the USS Enterprise?

 

[Rockadile]

With fan manually set to 2600 RPM:

Score: 4197
Temp: 72 C
Speed: 3.9-4.0 Ghz

Fan on Auto:

Score: 4181
Temp: 82 C
Speed: 3.8-3.9 Ghz

So fan set at full blast keeps the CPU cooler and creates a little bit more headroom to maintain a bit faster clock speed

Limiting it to 1 thread made no difference in clock speed or temp with fan going full blast or on auto control.

Seems like the power supply is the bottleneck, can't extract more performance out of it.

With that small of a difference, I would leave it on auto. I don't know how loud max RPM is but the i9 at 82C in a AIO is okay. I'd put it at a lower speed that's more comfortable to hear.

 

[quagmire]

Seems like the power supply is the bottleneck, can't extract more performance out of it.

With that small of a difference, I would leave it on auto. I don't know how loud max RPM is but the i9 at 82C in a AIO is okay. I'd put it at a lower speed that's more comfortable to hear.

Keep in mind when I ran X-Plane 10, it hit 90 C with fans on auto. So it can still get hotter if anything intensive remains longer than one cinebench run

 

[quagmire]

Reran my X-Plane 10 test this time with the fan set to 2600 RPM. CPU now running at 72 C and Vega at 68 C. That's 20 C cooler for the CPU and 10 C cooler for the GPU.

 

[WrightBrain]

Reran my X-Plane 10 test this time with the fan set to 2600 RPM. CPU now running at 72 C and Vega at 68 C. That's 20 C cooler for the CPU and 10 C cooler for the GPU.

Have you every played with Turbo Boost Switcher to disable Turbo Boost? I'd be interested to see how it affected the benchmarks and temps.

 

[kaintxu]

Hi guys,

Have a look at this video.

Could someone with the 580Xrun any of this games (even if only fortnite which is free to play) with same game config and tell us results?

Cheers

 

[Shivetya]

I do not like it. The graphic card performance gain is too small relative to 580. And this is in 2 years ...

we should be more concerned that after nearly two years the base graphics card in the iMac Pro is better. They gimped the iMac so as not to over shadow an already old iMac Pro setup.