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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. CopperheadOS‏ @CopperheadOS 27 Oct 2016

      Went with 750W 80 Plus Titanium PSU (94% efficiency) http://www.newegg.ca/Product/Product.aspx?Item=N82E16817438063 …. It'll pay itself off in 1-2 years and has a 10 year warranty.

      1 reply 0 retweets 0 likes
    2. CopperheadOS‏ @CopperheadOS 27 Oct 2016
      Replying to @CopperheadOS

      Even though @NeweggCan claims it's on $50 sale, it's 9 CAD higher than a direct US retail conversion. Getting free shipping + 25 off though.

      1 reply 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 27 Oct 2016
      Replying to @CopperheadOS

      Current PSU is 550W, a year old, and only 70% efficient. It'll probably kill itself under full CPU+GPU load. So this is pretty important...

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 27 Oct 2016
      Replying to @CopperheadOS

      Why still build these watt-guzzling monsters? You could get more perf/faster builds with lots of C2750's or similar.

      2 replies 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 27 Oct 2016
      Replying to @RichFelker

      It's not completely parallel. Chromium builds are more parallel than Android builds and there are other single-threaded loads.

      1 reply 0 retweets 0 likes
    6. CopperheadOS‏ @CopperheadOS 27 Oct 2016
      Replying to @CopperheadOS @RichFelker

      It wouldn't really distribute well across machines in practice. It really needs to be one machine. It'll be 300W under load.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 27 Oct 2016
      Replying to @CopperheadOS

      It's a shame there are no board (afaik) with multiple C2750's on them.

      10:19 AM - 27 Oct 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @RichFelker

          Even the i7-6950X is 1S, as are some Xeons. You pay a premium for 2S and then 4S for otherwise identical CPUs...

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          2S to 4S is an insane premium especially at the top end. Check out http://ark.intel.com/products/91317/Intel-Xeon-Processor-E5-2699-v4-55M-Cache-2_20-GHz … and then http://ark.intel.com/products/93805/Intel-Xeon-Processor-E5-4669-v4-55M-Cache-2_20-GHz ….

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          They also crippled the 4S one with an arbitrarily lower Turbo frequency, and AFAIK Xeon CPUs are locked so you can't raise that.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          A really nice thing about this i7-6950X is that per-core overclocking can be used. Can likely use 4.6GHz+ with 2 cores active.

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          So it can work well for the parallel workload (currently 4.1GHz with 10 cores active and 20 threads via HT) and single-threaded.

          1 reply 0 retweets 0 likes
        7. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          And with a 50% discount on any Intel CPU available to us, it really made a lot of sense to buy something quite expensive.

          1 reply 0 retweets 0 likes
        8. CopperheadOS‏ @CopperheadOS 27 Oct 2016
          Replying to @CopperheadOS @RichFelker

          Memory bandwidth / cache matters a lot too. This has 25MiB of L3 cache and quad channel DDR4 2400. Huge memory bandwidth.

          0 replies 0 retweets 0 likes
        9. End of conversation

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