Ryzen 3000 with high clock rates and low RAM latencies

AMD's Ryzen 3000 processors are designed to provide plenty of room to overclock and support fast memory.


AMD’s Ryzen 3000 processors are designed to provide plenty of room to overclock and support fast memory.

AMD’s Ryzen 3000 processors should be 4.5 GHz overclockable – and only at 1.35V and on all cores. At least that’s what Wccftech says, referring to Reddit.

A AIDA64 screenshot leaked via Twitter seems to confirm this and goes even further – hence the Ryzen 9 3900X runs with 4.6 GHz Allcore and binds DDR4 RAM with 4000 MHz and CL18 (timing).

The information about the overclocking potential of the Ryzen 3000 processors comes from an AMD subreddit, is very extensive and is based on test runs and experiences gathered by supposed experts and owners of so-called test samples in the last days. A reddit user summarizes the entire post history so :

  • 4.8GHz (OC) possible on all cores (though it will require more than 1.35V)
  • 4.4 GHz (Ryzen 3000) roughly equals the performance of an Intel i9-9900K at 5 GHz
  • 5 GHz possible, but for the time being only on one core
  • 5 GHz currently barely feasible on all cores
  • 1.35V @ 4.5GHz Allcore

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Passing Intel at 1.35V?

5 GHz multicore load does not seem to be realizable and not necessary with Ryzen 3000 (codename Matisse), because AMD’s 4.4 GHz should have a 15% increase in per-measure performance (Instructions per cycle, IPC) compared to Ryzen 2000 is currently Intel’s 5 GHz 9900K comparable to – at least in Cinebench.

With the postulated 4.5 GHz (OC) on all cores, at a voltage of only 1.35V the Ryzen 3000 CPUs should not Even be superior to counterparts.

However, the author of the abstract also points to poor memory timing associated with high clock rates in overclocking – he speaks of CL20 to CL24 .

However, it is not clear which CPUs the users of the Reddit forum used for their overclocking attempts. Especially early samples can differ severely from newer versions depending on Stepping and can deliver correspondingly different (worse) results.

First X570 board for Ryzen 3000 presented with passive cooling

Another leak comes to a very different conclusion. The screenshot of the AIDA64 cache and memory benchmark shows a AMD-12 core processor equipped with a AMD Matisse IMC (Integrated Memory Controller) Therefore, it is about the announced by AMD at Computex Ryzen 9 3900X act.

In addition, the CPU shown should be a B0 stepping – Steppings are sorted alphanumerically (A0 = earliest version, A1, B0, etc.) ,

Ryzen 9 3900X with 4.6 GHz and DDR4-4000

The Ryzen 9 3900X is said to have built-in memory benchmark with 4.6 GHz multi-core clock (AMD indicates 3.8 / 4.6 GHz, Turbo but only on a core) while supporting dual-channel DDR4 4000 MHz and a CAS (colums access strobe) -latency (CL) of 18 – the value indicates how many clock cycles (at CL18 are the 18 cycles) of memory needed to provide data.

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In general, therefore, a higher CL value means worse timing. However, the decisive factor is the combination of clock cycles (CAS latency, CL) and the duration of a cycle. The numerical CL value therefore only permits limited conclusions about the performance.

With the formula: (2 x timing) / Velocity in MHz you can easily calculate the timings yourself – correctly one would have to multiply by 10 high -6, but it is sufficient know that the result after the decimal indicates the storage time in nanoseconds (ns) (eg 0.0094 = 9.4 ns).

The total latency of the main memory is larger and consists of different values ​​(CAS, tRP, fuse) – these are simply added together. There are also delays in the system.

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New Low Latency Memory Controller?

Current systems (CPU + RAM) typically have a latency of about 60ns to 70ns – AIDA64 is the best system with 55.2ns. On the screenshot for the supposed Ryzen 9 3900X, there is a delay value for the memory of 39.6ns . That seems very fast.

AMD seems to have significantly improved the memory controller (IMC) of the Ryzen 3000 processors compared to its predecessors – Ryzen 2000 support so far officially DDR4-2933 (without OC), Zen 2 should GDR-3200 can control.

According to the board manufacturers, XMP-capable DDR4 modules on X570 boards can clock up to 4400 MHz (OC) and more.

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