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Journeyman III
Journeyman III

TR 1900X internals

I would like to know the Internal configuration of the TR 1900X a 8C/16T CPU.

Is it:

  1. 2 cores per CCX for both dies,
  2. One full 4 cores CCX per die,
  3. One 2x4 cores on one die the other die only delivering memory ports and extra PCI-E ports?

Thank you.

-ETL

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Esteemed Contributor III

Re: TR 1900X internals

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Journeyman III
Journeyman III

Re: TR 1900X internals

Thank you to point me to that TR review. I had seen it.

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Journeyman III
Journeyman III

Re: TR 1900X internals

To extend on the original post let's details some pros & cons of the three core-layouts.

Threadripper 1900X 8 cores - 16 Threads 4 memory channels.

One 16x PCI-E per die + 16 PCI-E lanes in a mix of (8x,4x) configuration.

Layout possible:

1) Two cores per CCX, 4 cores per die

     +: 4 x 8 MB L3 caches

     +: Thermal spread

     +:    Recycle die with defective core(s) on both ccx

     -: Increased average latency for thread to thread access.

2) One full 4 cores CCX per die

     +: Task in the 4-8 threads ranges.

     +: Driving dual HSA compute task with one GPU card attached to each die.

     -: 2 x 8 MB L3 caches.

3) One full die (i.e. both CCX fully populated) and one die providing extra memory channels and PCI-E lanes.

     +: Task in the 8-12 threads ranges: Keep the core to core latency low

     +: Balanced CPU-GPU HSA compute task with one GPU card attached to each die

    

    +-: The non uniform ressources repartition might be and advantage for some applications

        that require large amount of memory or will use the PCI-E lanes, on the die empty of core, for SSDs. 

     -: 2 x 8 MB L3 caches.

    

At first glance it seems that option 2 might be the most balanced one overall.

As the process mature and yields increase the ability to economically reuse die with defective cores on both CCX

will diminish.

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