Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Building a 128-thread cruncher?

  1. #1
    Join Date
    Sep 2010
    Location
    Leiden, the Netherlands
    Posts
    4,372

    Building a 128-thread cruncher?

    Now EPYC has arrived in the shops, as well as the EPYC boards, let's take a look at the offerings.

    Cheapest board (here at least) is the Supermicro H11DSi at 560 Euro, which is a dual Socket SP3 board.
    As all SP3 boards offered here have 16 RAM slots, and the EPYC boards do not have a chipset because EPYC is a SOC, we go for the Supermicro
    The five you can get here (Gigabyte, Tyan and three Supermicro) are all form factor EATX, so when you have a EATX case: you're in! Otherwise you need an EATX case.

    You might need a new PSU too, and when you're into servers and have a decent casing you might consider an extra redundant power supply, which takes over in case the first fails.
    The boards support up to 2TB of RAM, and for dual CPUs it is recommended that memory be populated equally in adjacent memory banks.
    You might consider buying smaller ECC Registered modules at first than the 256GB modules that are maximally supported, as you need [TTBOMK] eight modules per CPU, EPYC having octo-channel RAM.

    EPYC 7501 is the least power-hungry of the 32-core EPYCs at 155-170 Watt and they cost 3899 Euro each....ouch! Still much cheaper than the equivalent Intel offering though...

    When you are into single socket EPYC the 32-core EPYC 7551P can be bought for 2399 Euros

    You can also decide to wait for Starship and crunch on less cores until that launch. 16-core EPYC 7301 only costs 887 Euro, which is slightly cheaper than the -significantly faster- Threadripper 1950X.
    CPU/SOC Cores Socket Mobo format TDP Speed TDP/Thread
    Threadripper 1900X 8 TR4 single ATX-EATX 180 Watt 3800-4000 MHz 11.25 Watt
    EPYC 7251 8 SP3 single-SP3 dual EATX-EBB-Proprietary 120 Watt 2100-2900 MHz 7.50 Watt
    Threadripper 1920X 12 TR4 single ATX-EATX 180 Watt 3500-4000 MHz 7.50 Watt
    Threadripper 1950X 16 TR4 single ATX-EATX 180 Watt 3400-4000 MHz 5.63 Watt
    EPYC 7351P 16 SP3 single EATX-EBB-Proprietary 155/170 Watt 2400-2900 MHz 4.84-5.31 Watt
    EPYC 7281 16 SP3 single-SP3 dual EATX-EBB-Proprietary 155/170 Watt 2100-2700 MHz 4.84-5.31 Watt
    EPYC 7301 16 SP3 single-SP3 dual EATX-EBB-Proprietary 155/170 Watt 2200-2700 MHz 4.84-5.31 Watt
    EPYC 7351 16 SP3 single-SP3 dual EATX-EBB-Proprietary 155/170 Watt 2400-2900 MHz 4.84-5.31 Watt
    EPYC 7401P 24 SP3 single EATX-EBB-Proprietary 155/170 Watt 2000-2800 MHz 3.23-3.54 Watt
    EPYC 7401 24 SP3 single-SP3 dual EATX-EBB-Proprietary 155/170 Watt 2000-2800 MHz 3.23-3.54 Watt
    EPYC 7451 24 SP3 single-SP3 dual EATX-EBB-Proprietary 180 Watt 2300-2900 MHz 3.75 Watt
    EPYC 7551P 32 SP3 single EATX-EBB-Proprietary 180 Watt 2000-2550 MHz 2.81 Watt
    EPYC 7501 32 SP3 single-SP3 dual EATX-EBB-Proprietary 155/170 Watt 2000-2600 MHz 2.42-2.66 Watt
    EPYC 7551 32 SP3 single-SP3 dual EATX-EBB-Proprietary 180 Watt 2000-2550 MHz 2.81 Watt
    EPYC 7601 32 SP3 single-SP3 dual EATX-EBB-Proprietary 180 Watt 2200-2700 MHz 2.81 Watt
    Last edited by Dirk Broer; 01-08-2018 at 01:04 AM. Reason: TDP watts per thread


  2. #2
    NeoGen's Avatar
    NeoGen is offline AMD Users Alchemist Moderator
    Site Admin
    Join Date
    Oct 2003
    Location
    North Little Rock, AR (USA)
    Posts
    8,451
    Awesome table there Dirk.

    My one question that I've had in my mind but never actually researched into it is, does Threadripper (and their motherboards) fully support ECC RAM?
    I remember when Ryzen came out and I tried to find out and the best I could gather was "Yes, the CPU has ECC, but it is up to the motherboard to support it", which I think none did.

  3. #3
    Join Date
    Sep 2010
    Location
    Leiden, the Netherlands
    Posts
    4,372
    Quote Originally Posted by NeoGen View Post
    Awesome table there Dirk.

    My one question that I've had in my mind but never actually researched into it is, does Threadripper (and their motherboards) fully support ECC RAM?
    I remember when Ryzen came out and I tried to find out and the best I could gather was "Yes, the CPU has ECC, but it is up to the motherboard to support it", which I think none did.
    ECC RAM for Ryzen boards is supported on all Asrock mobos, to the best of my knowledge. Whether that support is full support I don't know.
    (there were some issues with the level of support for ECC RAM in ASUS AM1 boards, I remember)
    For Threadripper all mobos support ECC RAM, AFAIK


  4. #4
    Join Date
    Jul 2003
    Location
    Sydney, Australia
    Posts
    5,642
    EPYC is starting to reach the retail channel here too now. Just have to save up for it

  5. #5
    Join Date
    Sep 2010
    Location
    Leiden, the Netherlands
    Posts
    4,372
    Those 32-cores earn themselves back in a while with their low wattage per thread. Can't wait for the 48-cores to arrive....


  6. #6
    NeoGen's Avatar
    NeoGen is offline AMD Users Alchemist Moderator
    Site Admin
    Join Date
    Oct 2003
    Location
    North Little Rock, AR (USA)
    Posts
    8,451
    Hey Dirk, how is the TDP/Thread values calculated for the Epycs? For the Threadrippers I tried dividing it and get the same result as you have on the table, but for the Epycs the values I get are off somehow.

  7. #7
    Join Date
    Sep 2010
    Location
    Leiden, the Netherlands
    Posts
    4,372
    Quote Originally Posted by NeoGen View Post
    Hey Dirk, how is the TDP/Thread values calculated for the Epycs? For the Threadrippers I tried dividing it and get the same result as you have on the table, but for the Epycs the values I get are off somehow.
    watts tdp divided by the number of threads (which is twice the number of cores)


  8. #8
    NeoGen's Avatar
    NeoGen is offline AMD Users Alchemist Moderator
    Site Admin
    Join Date
    Oct 2003
    Location
    North Little Rock, AR (USA)
    Posts
    8,451
    I think the math is different for the EPYCs
    I picked the 8-core EPYC 7251 from your table (120W TDP) and did 120W/16t and my result is 7.5, but your table shows 8.2

  9. #9
    Join Date
    Sep 2010
    Location
    Leiden, the Netherlands
    Posts
    4,372
    I guess my solar-powered pocket calculator doesn't get enough light behind my desk...7.5 it is


  10. #10
    NeoGen's Avatar
    NeoGen is offline AMD Users Alchemist Moderator
    Site Admin
    Join Date
    Oct 2003
    Location
    North Little Rock, AR (USA)
    Posts
    8,451
    The ones that have "5.02-5.31 Watt" I think should be 4.84-5.31 (Which is even better)

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •