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    Comparison of S905X, S905X2, and S905Y2 Processors Specifications

    We now have all this information and some more thanks to a S905X/S905X2/S905Y2 comparison table released by SDMC a few days ago, and likely coming from Amlogic themselves.

    We now have all this information and some more thanks to a S905X/S905X2/S905Y2 comparison table released by SDMC a few days ago, and likely coming from Amlogic themselves.

    Functional Comparison of Amlogic S905X/ S905Y2 / S905X2 

     

      S905X SoC S905Y2 SoC S905X2 SoC
    Ultra Low Power —– Always On MCU and wake on voice Always On MCU and wake on voice
    CPU Quad-Core Cortex-A53, 13800 DMIPS Quad-Core Cortex-A53, 18400 DMIPS Quad-Core Cortex-A53, 18400 DMIPS
    GPU ARM Mali-450 MP3, 750MHz ARM Mali-G31 MP2, 850MHz ARM Mali-G31 MP2, 850MHz
    Security Secure boot, TEE, HW crypto, OTP, TRNG, Key ladder, Video Watermarking Secure boot, TEE, HW crypto, OTP, TRNG, Key ladder, Video Watermarking Secure boot, TEE, HW crypto, OTP, TRNG, Key ladder, Video Watermarking
    Memory 16/32-bit DDR3/4, LPDDR2/3, Up to 3GB, DDR2400 32-bit DDR3/4, LPDDR3/4, Up to 4GB, DDR3200 32-bit DDR3/4, LPDDR3/4, Up to 4GB, DDR3200
    Storage NAND Flash@BCH60, eMMC 5.0, SD, SPI NOR SLC NAND Flash, eMMC 50, SD, SPI NOR/NAND SLC NAND Flash, eMMC 50, SD, SPI NOR/NAND
    Video Decoder 4Kp60 10b H.265, 4Kp60 VP9 Profile 2, 4Kp30 H.264 4Kp75 10b H.265, VP9 Profile 2, AVS2 4Kp30 H.264 4Kp75 10b H.265, VP9 Profile 2, AVS2 4Kp30 H.264
    Video Encoder 1080p60 H.264 1080p60 H.264, H.265 1080p60 H.264, H.265
    PQ Engine Basic PQ 8-th Gen TruLife Image Engine 8-th Gen TruLife Image Engine
    Ethernet 10/100 MAC + PHY —– 10/100/1000 MAC + 10/100 PHY
    USB/PCI-e 2x USB 2.0 2x USB 2.0 + USB 3.0 / PCIe Gen-2 2x USB 2.0 + USB 3.0 / PCIe Gen-2
    Audio Stereo DACs, SPDIF-out, PDM, 2x L2S out Stereo DACs, SPDIF-out, 8x L2S in, 8x L2S out, 8x PD Stereo DACs, SPDIF-out, 8x L2S in, 8x L2S out, 8x PD
    Video Output 4Kp60 HDMI 2.0b, CVBS 4Kp60 HDMI 2.1 4Kp60 HDMI 2.1, CVBS
    Video Input —- TS in DVP, TS in
    HDR HDR10, HLG HDR10, HLG, Dolby Vision, TCH Prime HDR10, HLG, Dolby Vision, TCH Prime
    Package 13mm x 13mm BGA 10.9mm x 10.9mm BGA 14mm x 14mm BGA
    Technology 28nm 12nm 12nm

    There actually more differences than I expected. Going from top to bottom in the comparison table above, the new processors feature an ultra-low power MCU core to be used for wake-word detection, and possibly other features. We did not get CPU frequency numbers per say, but since Amlogic released DMIPS values and Cortex A53 core scores 2.3 DMIPS/MHz, we can easily derive it:

    • Amlogic S905X – 13,800 DMIPS / 4 cores / 2.3 DMIPS/MHz = 1500 MHz
    • Amlogic S905X2 / S905Y2 – 18,400 DMIPS / 4 cores / 2.3 DMIPS/MHz = 2000 MHz

    Bear in mind those are still numbers from a document, and actual testing will be require to find out whether Amlogic massaged the numbers once again. The Mali-G31 GPU is closed at up to 850 MHz, against 750 MHz with the Mali-450 GPU in S905X.

    The memory interface has improved as well with the new SoCs supporting LPDDR3/4 up to 3200 MHz, and up to 4GB RAM, but we already knew that part thanks to TV boxes announcement. There’s also a small change for storage interfaces with NAND SLC and SPI NAND flash now supported, but I’m not sure this is a significant change since most systems should be relying on eMMC flash.

    The hardware video decoder can now handle 4K videos up to 75 Hz instead of just 60 Hz (why? probably just because it can unless I missed something), and adds support for AVS2 that should mostly/only matter for the Chinese market. There’s also an enhanced video post-processing engine called “8th Gen TruLife Image Engine”. S905X supported HDR10 and HLG high-dynamic range solutions, and the new processors add Dolby Vision and TCH Prime (which I never heard of). Video output is indeed HDMI 2.1 as reported on some products page, but of course without 8K video support. S905X2 also includes a CVBS interface for composite audio. as well as a DVP camera interface, but not S905Y2, which makes sense due to the latter targeting HDMI TV sticks.

    For the same reason, Ethernet is gone on Amlogic S905Y2, while Amlogic S905X2 comes with both a Gigabit Ethernet MAC, and a Fast Ethernet PHY. Both new processors also add USB 3.0 and PCIe Gen-2 interfaces, as well as TS input interface for digital TV tuners. S905Y2 and S905X2 have been designed for smart voice application, and beside the wake-word MCU, they also support 8x microphone arrays via I2S and PDM interfaces.

    There was a somewhat heated discussion about the manufacturing process last time, and we finally know the answer: S905X2 & S905Y2 are manufactured using a 12nn process. S905Y2 has the smaller package (10.9×10.9mm BGA) of the three processors,  while S905X2 is a bit bigger even compared to S905X due to the extra features with a 14x14mm BGA package.

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