AMD Ryzen 5 core allocation revealed, disabled in symmetrical pairs

Posted on Friday, March 17 2017 @ 11:33 CET by Thomas De Maesschalck
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AMD revealed details about what's going on under the hood of its Ryzen 5 processors. As you may know, the current quad-core, six-core and eight-core Ryzen processors are all based on the same die. The eight-core models are the full versions of the chip whereas the other models are made by disabling cores.

Now Legit Reviews has a bit more details and it seems AMD will disable cores in symmetrical pairs. So you will always have two CPU complex (CCX) blocks with a symmetrical number of activated cores, meaning 2:2, 3:3 or 4:4 configurations. AMD will not ship Ryzen processors with 4:0 or 0:4 configurations.

Here's how the Ryzen lineup looks like, with the three Ryzen 7 CPUs already on the market and the Ryzen 5 CPUs to follow on April 11:
  • Ryzen 7 1800X: 8 cores (4+4), 16 threads, 16MB L3, 4MB L2, 3.6GHz to 4GHz, $499
  • Ryzen 7 1700X: 8 cores (4+4), 16 threads, 16MB L3, 4MB L2, 3.4GHz to 3.8GHz, $399
  • Ryzen 7 1700: 8 cores (4+4), 16 threads, 16MB L3, 4MB L2, 3GHz to 3.7GHz, $329
  • Ryzen 5 1600X: 6 cores (3+3), 12 threads, 16MB L3, 3MB L2, 3.6GHz to 4GHz, $249
  • Ryzen 5 1600: 6 cores (3+3), 12 threads, 16MB L3, 3MB L2, 3.2GHz to 3.6GHz, $219
  • Ryzen 5 1500X: 4 cores (2+2), 8 threads, 16MB L3, 2MB L2, 3.5GHz to 3.7GHz, $189
  • Ryzen 5 1400: 4 cores (2+2), 8 threads, 8MB L3 (split 4MB per CCX), 2MB L2, 3.2GHz to 3.4GHz, $169
  • Because Ryzen 5 and Ryzen 7 share the same die, one question that pops up is whether it will be possible to reactivate the disabled cores. At the moment, we have no idea.

    About the Author

    Thomas De Maesschalck

    Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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