[HN Gopher] AMD's Strix Point: Zen 5 Hits Mobile
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       AMD's Strix Point: Zen 5 Hits Mobile
        
       Author : klelatti
       Score  : 31 points
       Date   : 2024-08-10 21:18 UTC (1 hours ago)
        
 (HTM) web link (chipsandcheese.com)
 (TXT) w3m dump (chipsandcheese.com)
        
       | sm_1024 wrote:
       | IMO, the most interesting thing about this line is the battery
       | life---within an hour of MBP3 and within 2 hours of Asus's
       | Qualcomm. Making it comparable to ARM architectures.
       | 
       | Which is a little surprising because ARM is commonly believed to
       | be much more power efficient than x86.
       | 
       | [1] https://youtu.be/Z8WKR0VHfJw?si=A7zbFY2lsDa8iVQN&t=277
        
         | jiggawatts wrote:
         | > because ARM is commonly believed to be much more power
         | efficient than x86.
         | 
         | Because most ARM processors were designed for mobile phones and
         | optimised to death for power efficiency.
         | 
         | The total power usage of the front end decoders is a single
         | digit percentage of the total power draw. Even if ARM magically
         | needed 0 watts for this, it couldn't save more power than that.
         | The rest of the processor design elements are essentially
         | identical.
        
         | halJordan wrote:
         | Yeah if you make a worse core and then downclock it then you
         | will increase power efficiency. AMD thankfully only downclocks
         | the 5c, but Intel is shipping ivy lake equivalents in their
         | flagship products just to get power efficiency up.
        
         | arnaudsm wrote:
         | ARM got a lot of hype since the release of the M1, but most
         | users only compared it to the terrible Intel MBPs. Ryzen mobile
         | has been consistently close to Apple silicon perf/watt for 5
         | years. But got little press coverage.
         | 
         | Hype can be really decorrelated from real world performance.
        
           | sm_1024 wrote:
           | I have heard that part of the reason for little coverage of
           | ryzen mobile CPUs is their limited availability as AMD was
           | focussing on using the fab capacity for server chips.
        
         | wtallis wrote:
         | The CPU core's instruction set has no influence on how well the
         | chip as a whole manages power when not executing instructions.
        
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       (page generated 2024-08-10 23:00 UTC)