5700 vs. 5700 XT: performance, temperature and noise

[miretogo]

According to the stats at the bottom of AMDs Radeon Pro 5000 Series page (https://www.amd.com/en/graphics/radeon-apple-5000-series), all GPU options in the new 2020 iMac (5300, 5500 XT, 5700 and 5700 XT) have the same power limit, called "TGP" (total graphics power).

Do the test results support the assumption that they are identical in terms of temperature and noise?

Also, do we have comparative GPU benchmark values that show how much faster the 5700 XT is? Based on the stats, I would guess 10-25%.

 

[wave84]

Very theoretically speaking, more computing cores is a linear increase in thermal output, while bigger clock speed is closer to an exponential increase. So again, at least in theory, although they share the same TDP, the 5700 should be outputting less heat and noise than the XT, and probably even than the base models.

 

[miretogo]

You described very precisely how it would be in theory. In practice, however, I assume that they are dynamically clocked in a way that they reach maximum performance within the 130W thermal limit (TGP) and are therefore almost identical in terms of temperature and noise.

 

[Klaus_mac]

I'm also waiting for tests 5700 vs 5700 XT

 

[pldelisle]

You described very precisely how it would be in theory. In practice, however, I assume that they are dynamically clocked in a way that they reach maximum performance within the 130W thermal limit (TGP) and are therefore almost identical in terms of temperature and noise.

Yeah. Temperature is the independent variable, while clock is the dependant variable in function of temperature. 5500XT and 5700/5700XT should all reach the exact same temperature, just at different clock speed. Just like the CPUs too.
There is a power and temperature budget. Chips are programmed to fully exploit it, but this implies clock frequency modulation in function of temperature.

 

[Klaus_mac]

It would be good to make a test for 5500 XT vs 5700 vs 5700 XT. To make it clear what the difference is between them. So far we have to collect information bit by bit

 

[SmallDane]

This site has some benchmarks that could be relevant: http://www.macotakara.jp/blog/macintosh/entry-40130.html

Though I have some doubts about the numbers since they got higher numbers for the i5 than the i7. That seems strange.

 

[Klaus_mac]

This site has some benchmarks that could be relevant: http://www.macotakara.jp/blog/macintosh/entry-40130.html

Though I have some doubts about the numbers since they got higher numbers for the i5 than the i7. That seems strange.

Thanks! I just wanted to test them under the same conditions, like all three with an i7 processor.