Announcement

Collapse
No announcement yet.

AMD Ryzen CPU frequency measurements while overclocking in different power modes

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • AMD Ryzen CPU frequency measurements while overclocking in different power modes

    In case anyone was wondering.

    Here are the (slightly surprising) results of our code to measure the clock speed on the new Ryzen CPUs.

    The Ryzen CPU is more complex that past CPUs as it has an XFR feature (eXtended Frequency Range) feature that can lift the clock speed by a 100Mhz over the documented speeds. It is also effected by the Windows power policy in a way that other CPUs aren't. Further the BIOS options on our motherboard don't allow much flexibility for overclocking. So both the base speed and the turbo speed seem to be impacted.

    These result below are for a Ryzen 7 1700X (which in theory has a 3.4Ghz base speed and a 3.8GHz Turbo speed).

    PerformanceTest V9 Build 1013 PerformanceTest V9 Build 1013
    Power Mode = High Performance Power Mode = Balanced
    Base Clock Turbo Clock Base Clock Turbo Clock
    Over Clocking Disabled (Default) 3115.1 3893.9 3394.8 3894.4
    3394.1 3889.6 3394.5 3894.5
    3115.1 3894 3394.6 3894
    3115.1 3894.1 3394.7 3894.1
    3115 3894 3394.6 3894
    Over Clocking Enabled
    P-state 0 = 3.7GHz
    3694.1 3694.2 3694 3694
    3694.2 3694.2 3694.5 3694.5
    3694.2 3694.3 3694.3 3694.7
    3694.3 3694.1 3694.4 3694.8
    3694.4 3694.44 3694.4 3694.3
    Over Clocking Enabled
    P-state 0 = 4GHz
    3993.7 3993.9 3994.1 3995.3
    3993.6 3993.7 3994.3 3994
    3993.9 3993.8 3993.9 3994.3
    3993.8 3993.7 3994.1 3994.5
    3993.7 3994 3994.2 3994

    Note that since doing these measurements AMD has said they will be doing a patch that will alter the Power Mode policy behaviour. We don't know what effect this will have.

    Also strange is that XFR is disabled when overclocking is active. So at least in theory light overclocking on the Ryzen shouldn't gain much.

  • #2
    That is quite interesting. With the 1800x i get a result of 2958,4 and Turbo 3695,1 with the Balanced Power Profile that AMD released a while ago.
    Furthermore I have a question, is it normal that the Memory Latency is at 66 in a best Case Benchmark?
    See #822051 before optimizing RAM and #822105 after optimizing RAM.

    Comment


    • #3
      Yes, around 60ns seems to be around the best with DDR4 and these new AMD CPUs. We don't really understand why is it so much worse than Intel (best) CPUs.

      Comment

      Working...
      X