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Strange Brigade The Division 2
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  • mildewman - Sunday, July 7, 2019 - link

    Can someone explain to me why Navi requires twice the number of transistors (10.3B) compared to Polaris (5.7B) for the same number of CU's ? Reply
  • rUmX - Sunday, July 7, 2019 - link

    It's no longer the same architecture. RDNA vs GCN. The fact that a 36 CU (5700) consistently beats Vega 56 (56 CU) shows the design changes. Sure part of it is clock speeds and having 64 ROPs but still Navi is much more efficient than GCN, and it's doing it with much less shaders. Imagine a bigger Navi can match it exceed the 2080 TI. Reply
  • Kevin G - Sunday, July 7, 2019 - link

    Not all those transistors are for the improved CUs either. There is a new memory controller to support GDDR6, new video codec engine and some spent on the new display controller to support DSC for 4K120 on DP 1.4. Reply
  • peevee - Thursday, July 11, 2019 - link

    Why would GDDR6 need substantially more transistors than GDDR5? Video codec seems more or less the same also.
    Looks like there are some hidden features not enabled yet, hard to explain that increase in transistors per stream processor (not CU) otherwise (CUs are just twice as wide).
    Reply
  • Meteor2 - Monday, July 8, 2019 - link

    I was wondering the same thing. Reply
  • JasonMZW20 - Tuesday, July 16, 2019 - link

    Because it's now a VLIW2 architecture via RDNA. Each CU is actually a dual-CU set (2x32SPs, 64 SPs total) and is paired with another dual-CU to form of workgroup processor (4x32) or 128 SPs. Tons of cache has been added and rearranged. This requires space and extra logic.

    Geometry engines (via Primitive Units) are fully programmable and are no longer fixed function. This also requires extra logic. Rasterizer, ROPs, and Primitive Unit with 128KB L1 cache are closely tied together.

    Navi definitely replaces both Polaris and Vega 10/20 for gaming, so average out Polaris 30 (5.7B) and Vega 10 (12.5B) transistor amounts and you'll be somewhere near Navi 10. Vega 20 is still great at compute tasks, so I don't see it being phased out in professional markets soon.
    Reply
  • tipoo - Sunday, July 7, 2019 - link

    Do those last (at least two) Beyond3D tests look a little suspect to anyone? Multiple AMD generations all clustering around 1.0, almost looks like a driver cap. Reply
  • rUmX - Sunday, July 7, 2019 - link

    Ugh no edit... I meant "Big Navi can match or exceed 2080 TI". Reply
  • Kevin G - Sunday, July 7, 2019 - link

    Looking at the generations it doesn't surprise me about the RX 580 but it is odd to see the RX 5700 there, especially when Vega is higher. An extra 20% of bandwidth for the RX 5700 via compression would go a long way at 4K resolutions. Reply
  • Ryan Smith - Sunday, July 7, 2019 - link

    It's a weird situation. The default I use for the test is to try to saturate the cards with several textures; however AMD's cards do better with just 1-2 textures. I'll have a longer explanation once I get caught up on writing.

    From my notes: (in GB/sec, random/black)

    UINT8 1 Tex: 333/472
    FP32 1 Tex: 445/469
    UNIT8 6 Tex: 389/406
    FP32 6 Tex: 406/406
    Reply

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