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GPUs can now use PCIe-attached memory or SSDs to boost VRAM capacity
Provided that AMD, Intel, and Nvidia would like to support CXL for memory expansions.
(Image credit: Panmnesia)To address this, Panmnesia developed a CXL 3.1-compliant root complex (RC) equipped with multiple root ports (RPs) that support external memory over PCIe) and a host bridge with a host-managed device memory (HDM) decoder that connects to the GPU's system bus. (Image credit: Panmnesia)The solution (based on a custom GPU and marked as CXL-Opt) underwent extensive testing, showing a two-digit nanosecond round-trip latency (compared to 250ns in the case of prototypes developed by Samsung and Meta, which is marked as CXL-Proto in the graphs below), including the time needed for protocol conversion between standard memory operations and CXL flit transmissions, according to Panmnesia. If the approach of using PCIe-attached memory for GPUs does gather steam, only time will tell if the industry heavyweights will use IP blocks from companies like Panmnesia or simply develop their own tech.
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