Bolt Graphics Zeus Architecture We are not getting a full block diagram yet, but this is a RISC-V RVA23 out-of-order scalar core. There are then vector cores and accelerators. Something that is at least slightly reminiscent of some other startups we have seen is the use of RISC-V. Instead of building its own ground-up ISA, it can use RISC-V plus then add its own special sauce. Bolt Zeus Announcement Architecture 1 It feels a bit like the Zeus 1c26-032 is a single chiplet part. We have DP 2.1a, HDMI 2.1b, and then some really neat features. Namely, there is a RJ45 BMC port as we have seen on DPUs, servers, and other components, but less commonly on GPUs. There is a QSFP-DD port for 400GbE, and two PCIe Gen5 x16 slots. Bolt Graphics can apparently do PCIe Gen5 / CXL 3.0 and Ethernet for a lot of flexibility. On the memory side, there is 32GB of LPDDR5X and up to 128GB of DDR5. The LPDDR5X here is being used because it is cheaper and higher capacity than either HBM3 or GDDR7. Bolt Zeus Announcement Architecture 2 The Zeus 2c26-064/128 is the two chiplet module. The 64 or 128 seems to be the capacity of the LPDDR5X. Bolt Zeus Announcement Architecture 3 Scaling up, and very interesting here, is the Zeus 4c26-256. Each chiplet gets an I/O chiplet and 64GB Of LPDDR5X. So there is a lot of OSFP 800GbE connectivity along with PCIe Gen5 and memory. Something to keep in mind here is that we often say that PCIe Gen5 x16 is around a 400GbE port. So with two Gen5 x16 ports, and the ability to do either PCIe/ CXL or Ethernet, that seems to track the diagram here. With 256GB of LPDDR5X and 512GB of DDR5 DIMMs per chiplet for 2TB, that gives us the 2.2TB of memory total on the GPU. Bolt Zeus Announcement Architecture 4 Taking a look at the smaller chiplet, this is the Zeus 1c26-032 card. You can see the two DDR5 SODIMM slots on the card as part of the expandable memory. Bolt Zeus Announcement 1c26 032 Bottom Edge We can also see the BMC port, HDMI port, DisplayPort, and the QSFP-DD...
First seen: 2025-03-29 17:29
Last seen: 2025-03-29 17:29