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Interconnect Technology Comparison

Interconnect Technology Products or Vendor Physical Domain Cache Coherent Access Semantic Maximum Bandwidth Medium Latency
Gen-Z78 N/A Cross components ✖ Memory 32 GBps ~ 400+ GBps
Unidirectional		 <100ns
OpenCAPI7 IBM Power9 Motherboard ✔ Memory 50 GBps per lane
Bidirectional		 ?
CCIX7 N/A Motherboard ✔ Memory 32/40/50 GBps/lane
Bidirectional		 ?
OmniPath910 Intel KnightsLanding Cross networrk ✖ Network 25 GBps/port
Bidirectional		 ?
PCIe 3.0 A Lot Motherboard ✖ PCIe ~1GBps/lane12 4B Read ~756ns11
PCIe 4.0 Soon Motherboard ✖ PCIe ~2GBps/lane ?
IB EDR Mellanox ConnectX4,X5 Cross network ✖ Network 100Gbps 0.5us
IB HDR Mellanox ConnectX6 Cross network ✖ Network 200Gbps <0.5us
HyperTransport4 AMD Motherboard ✔ Memory 51.2 GBps per link
Bidirectional		 ?
NVLink2 NVIDIA V100
IBM Power9		 Motherboard ✔ Memory 50GBps per link
Bidirectional		 ?
QPI56 Intel Motherboard ✔ Memory ? ?
Intel Main Memory Bus Intel Processor ✔ Memory E7-8894 v4 85 GB/s
E5-2620 v3 59 GB/s		 ?
Ethernet3 A Lot Motherboard ✖ Network Mellanox 200Gbps
Cisco ASR 100 Gbps1		 ?
  • POWER9, NVLink 2.0, 300GB/s

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Created: Feb 28, 2018
Last Updated: March 01, 2018

  1. Ethernet Cisco ASR 9000 Series 4-Port 100-Gigabit Ethernet ↩

  2. Terabit Ethernet https://en.wikipedia.org/wiki/NVLink ↩

  3. NVLink ↩

  4. HyperTransport ↩

  5. https://en.wikipedia.org/wiki/Intel_QuickPath_Interconnect ↩

  6. https://communities.intel.com/thread/21872 ↩

  7. https://www.openfabrics.org/images/eventpresos/2017presentations/213_CCIXGen-Z_BBenton.pdf ↩↩↩

  8. Gen-Z Overview ↩

  9. http://www.hoti.org/hoti23/slides/rimmer.pdf ↩

  10. https://www.intel.com/content/www/us/en/products/network-io/high-performance-fabrics/omni-path-edge-switch-100-series.html ↩

  11. https://forum.stanford.edu/events/posterslides/LowLatencyNetworkInterfaces.pdf ↩

  12. https://www.xilinx.com/support/documentation/white_papers/wp350.pdf ↩

Last update: March 3, 2018

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