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Which GPU memory interface is best? 256-bit, 512-bit or 4096-bit(HBM)?

Gizmo84Gizmo84 Member Posts: 25
Can anyone explain which is best for ETH mining and why? @Genoil any insight on this? I thought wider interface (HBM 4096) would be best, but the Nano and fury arent any better than the r9 390 at hashing. i know the nano is less power. Also the new GPU's from AMD and Nvidia both have 256bit memory interface. so, can someone elaborate on the best fit for ETH mining?

Comments

  • adasebadaseb Member Posts: 1,043 ✭✭✭
    Its depends how much you pay for power.
  • Gizmo84Gizmo84 Member Posts: 25
    adaseb said:

    Its depends how much you pay for power.

    $0.0439 a kwh
  • adasebadaseb Member Posts: 1,043 ✭✭✭
    Then you should just get a 7950/7970/280x/290/380/380x

    Whichever is cheapest
  • dlehenkydlehenky Member Posts: 2,249 ✭✭✭✭
    HBM is so wide the ETH algo can't take full advantage of it (the algo does 128 byte random reads). 512 is better than 256, but the 512 cards are usually power hogs, too, and it's not as though the 512 cards are twice as fast as the 256 cards.
  • GenoilGenoil 0xeb9310b185455f863f526dab3d245809f6854b4dMember Posts: 769 ✭✭✭
    I was actually thinking about this once again this morning, trying to figure out how on earth Wolf0 got his optimization together.

    @dlehenky I'm not entirely sure about HBM being 'too wide'. If it did only a single 128-byte (1024-bit) access at a time, the effective maximum bandwidth would be 128GB/s, yielding only a max theoretical hashrate of 16MH/s, which isn't the case.

    For the rest it seems like 256-bit is the bus width of next GPU season, although 512-bit does indeed work out better for ethash.
  • dlehenkydlehenky Member Posts: 2,249 ✭✭✭✭
    @Genoil It does do double that (128 GB/s), because it's doing double the accesses per clock. So, you're right, it does get 256 GB/sec, effectively, but the bus is wide enough to do twice that, it's just that the ETH algo cannot take advantage of that fact. Half the HBM bandwidth is left on the table, that's all I was, not very successfully, trying to say.
  • HelioxHeliox Member, Moderator Posts: 633 mod
    @Genoil

    I was talking to Wolf earlier on IRC.

    His optimization is there, true, but it's not at any rate where i'm impressed to be honest.

    He's doing 31Mh on a 290x @ 1100 core.

    I'm doing 31Mh on a 290x @ 1050 core... (not dual mining..)

    I told him this and also how and why, so i guess he'll be pushing something new in the next few days..

    I'm curious :)

    Greetings
  • Gizmo84Gizmo84 Member Posts: 25
    edited June 2016
    bitcanuck said:

    Gizmo84 said:

    adaseb said:

    Its depends how much you pay for power.

    $0.0439 a kwh
    That's cheap. What city do you live in?
    Philadelphia USA
  • Gizmo84Gizmo84 Member Posts: 25
    bitcanuck said:

    Gizmo84 said:

    bitcanuck said:

    Gizmo84 said:

    adaseb said:

    Its depends how much you pay for power.

    $0.0439 a kwh
    That's cheap. What city do you live in?
    Philadelphia USA
    Interesting to know the cheap wholesale power rates from nat. gas power plans feeding from Utica/Marcellus is actually flowing down to retail power rates.
    Yea this is the cheapest ive ever seen it. it's awesome. its why im getting into mining again :smiley:
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