Originally posted by Michael
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Place Your Bets Now About The Power Efficiency Of The Radeon RX 480 On Linux
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I would not place a bet but looking at some of the open code contributions, polaris might have the potential to improve efficiency on Linux a lot. Of course I don't know how mature the driver code is, but when I read things like "per CU power gating", it could save a lot of power in those exact situations where it is underperforming and not fully occupied. "Just" completely power-gate those CUs that are not working, while keeping the clocks up and not throttle other parts of the chip down -> rather big efficiency boost!(?) we'll see...
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Originally posted by bridgman View PostJust a caution - IIRC the per-CU power gating is for Polaris 11 only and the initial test results will be for Polaris 10.
That's sad, even CZ was capable a year ago (while I don't know if supported by any production driver)...
https://cgit.freedesktop.org/~agd5f/...t-4.8-wip#n410
https://cgit.freedesktop.org/~agd5f/...-4.8-wip#n5368
https://cgit.freedesktop.org/~agd5f/...t-4.8-wip#n162
Seems you're right, however
Polaris11 only for now
Still a bit confusing, was P11 planned to be released before P10 initially?
One more day to go, anyone knows the actual time of NDA expiration?
BTW: What are "golden settings"? I wonder all the time...Last edited by juno; 28 June 2016, 05:37 AM.
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Not sure about intended launch sequence; we always talked about them internally as a pair so I imagine the plan was to launch at more or less the same time. My impression was that per-CU PG was for the smaller chip only since that was the one that would see heavy use in laptops.
Golden settings are the accumulation of all the "set register ABC to XYZ" directions we get from the hardware team, turned into a sequenced data table (sequence can be really important) and set up at the start of HW initialization (or presumably on restore).Test signature
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Originally posted by bridgman View PostNot sure about intended launch sequence; we always talked about them internally as a pair so I imagine the plan was to launch at more or less the same time. My impression was that per-CU PG was for the smaller chip only since that was the one that would see heavy use in laptops.
Golden settings are the accumulation of all the "set register ABC to XYZ" directions we get from the hardware team, turned into a sequenced data table (sequence can be really important) and set up at the start of HW initialization (or presumably on restore).
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Originally posted by artivision View PostI am afraid from the bad naming(M480 for an equivalent of the RX460), that the M480 price will be to high.
Originally posted by artivision View PostI am also afraid that consoles will get again a stronger APU(4.5-6Tflops) versus laptops(2-2.5).
Originally posted by artivision View PostI also don't understand why laptops don't get the lowest LP lithography (3-3.3ghz max for the cpu, 0.9-1ghz max for the gpu).Test signature
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Originally posted by bridgman View Post
Just curious, what is this based on ?
Yeah, as long as consoles plug into the wall and laptops run on batteries there's going to be pressure to put smaller HW into laptops. That said you see big-ass gaming laptops today and I don't see any sign of that changing.
Don't understand this - you're talking about Line Pitch aren't you ? What is the connection between lowest LP lithography and clocks ? Laptops tend to get low clocks simply because wide low-clocked hardware tends to use less power than narrow high-clocked hardware for the same performance.
Also for strong Laptop APUs, I mean if they will exist at all, not if they require bigger Laptops.
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There are no stronger APUs than Bristol Ridge yet. Console SoCs are semi-custom, designed together with and funded by the customers/partners.
Raven Ridge should bring both Zen cores and GCN Gen.4 together next year, if we are lucky maybe even with HBM, but I think that's more wishful thinking and out of profitability
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