4 ms·

Which review has power usage comparison?

by MikusR 10y ago

jhasse 10y ago
computerbase.de has here: https://www.computerbase.de/2017-03/amd-ryzen-1800x-1700x-1700-test/6/ https://www.computerbase.de/2017-03/amd-ryzen-1800x-1700x-17... R7 1700 i7 7700K Cinebench 120 W 112 W Prime 95 128 W 145 W
- tutanchamun 10y ago
  Doesn't Prime95 use AVX2 and FMA3 since version 28.5, which pushes Intel's power consumption higher? Can that be disabled?
  - jhasse 10y ago
    Yes, that's probably the reason for the increased power consumption. But Ryzen also supports AVX2, doesn't it?
    - tutanchamun 10y ago
      Ah yeah, remembered it false. I thought Ryzen had no AVX2, but actually it has it, but at half the speed.
      - throwaway2048 10y ago
        Half the width, 128bit vs 256bit. Often translates to half the speed but not always.
      - hajile 10y ago
        Ryzen is half as wide, but executes at full speed. Intel drastically reduces clockspeeds when executing AVX. http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/performance-xeon-e5-v3-advanced-vector-extensions-paper.pdf http://www.intel.com/content/dam/www/public/us/en/documents/...
tutanchamun 10y ago
computerbase.de: https://translate.google.com/translate?sl=de&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u=https%3A%2F%2Fwww.computerbase.de%2F2017-03%2Famd-ryzen-1800x-1700x-1700-test%2F6%2F&edit-text= https://translate.google.com/translate?sl=de&tl=en&js=y&prev... tomshardware: http://www.tomshardware.com/reviews/amd-ryzen-7-1800x-cpu,4951-11.html http://www.tomshardware.com/reviews/amd-ryzen-7-1800x-cpu,49...
robotmay 10y ago
I haven't found one yet, but as the chip is rated at 65W and the i7 7700k at 91W, it's pretty likely to draw less (at load anyway). I'd be curious to see what they draw whilst idle though.
- robotmay 10y ago
  After having a look at some of the links posted, it looks like the power draw is slightly higher than the i7 7700k in most tests, although lower in some. Looks like my assumption based on the TDP was a bit off (also my misapprehension that TDP is power draw, whoops) :)
  - rockdoe 10y ago
    Thermal output = power draw is correct though.

Which review has power usage comparison?

by MikusR 10y ago

Which review has power usage comparison?

computerbase.de has here: https://www.computerbase.de/2017-03/amd-ryzen-1800x-1700x-1700-test/6/ https://www.computerbase.de/2017-03/amd-ryzen-1800x-1700x-17... R7 1700 i7 7700K Cinebench 120 W 112 W Prime 95 128 W 145 W

tutanchamun 10y ago
Doesn't Prime95 use AVX2 and FMA3 since version 28.5, which pushes Intel's power consumption higher? Can that be disabled?
- jhasse 10y ago
  Yes, that's probably the reason for the increased power consumption. But Ryzen also supports AVX2, doesn't it?
  - tutanchamun 10y ago
    Ah yeah, remembered it false. I thought Ryzen had no AVX2, but actually it has it, but at half the speed.
    - throwaway2048 10y ago
      Half the width, 128bit vs 256bit. Often translates to half the speed but not always.
    - hajile 10y ago
      Ryzen is half as wide, but executes at full speed. Intel drastically reduces clockspeeds when executing AVX. http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/performance-xeon-e5-v3-advanced-vector-extensions-paper.pdf http://www.intel.com/content/dam/www/public/us/en/documents/...

tutanchamun 10y ago

computerbase.de: https://translate.google.com/translate?sl=de&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u=https%3A%2F%2Fwww.computerbase.de%2F2017-03%2Famd-ryzen-1800x-1700x-1700-test%2F6%2F&edit-text= https://translate.google.com/translate?sl=de&tl=en&js=y&prev... tomshardware: http://www.tomshardware.com/reviews/amd-ryzen-7-1800x-cpu,4951-11.html http://www.tomshardware.com/reviews/amd-ryzen-7-1800x-cpu,49...

robotmay 10y ago

I haven't found one yet, but as the chip is rated at 65W and the i7 7700k at 91W, it's pretty likely to draw less (at load anyway). I'd be curious to see what they draw whilst idle though.

robotmay 10y ago
After having a look at some of the links posted, it looks like the power draw is slightly higher than the i7 7700k in most tests, although lower in some. Looks like my assumption based on the TDP was a bit off (also my misapprehension that TDP is power draw, whoops) :)
- rockdoe 10y ago
  Thermal output = power draw is correct though.