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Thread: Single Vs Dual Rank Memory

  1. #17
    root Member DanceswithUnix's Avatar
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    Re: Single Vs Dual Rank Memory

    Quote Originally Posted by ik9000 View Post
    isn't the formula CL*2000/MHz?
    There could well be a factor of 2 in there. They call this stuff DDR, despite things having moved on quite a long way since the original DDR, so a factor of 2 in there makes sense. I was already quietly glossing over the fact that 16/3600MHz gives a hard to read microseconds answer and multiplying my answer by 1000.

    So yeah, I'll go with the equation you gave.

    OTOH, I think the ram in this machine is JEDEC standard, so 3200 CL 24. That's 15 ns. I should try tightening that up really, it's ECC so I will actually know if I've overdone it

  2. #18
    RIP Peterb ik9000's Avatar
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    Re: Single Vs Dual Rank Memory

    Quote Originally Posted by DanceswithUnix View Post
    There could well be a factor of 2 in there. They call this stuff DDR, despite things having moved on quite a long way since the original DDR, so a factor of 2 in there makes sense. I was already quietly glossing over the fact that 16/3600MHz gives a hard to read microseconds answer and multiplying my answer by 1000.

    So yeah, I'll go with the equation you gave.

    OTOH, I think the ram in this machine is JEDEC standard, so 3200 CL 24. That's 15 ns. I should try tightening that up really, it's ECC so I will actually know if I've overdone it
    ooh i would like ECC. Next build... (i say this every time)

  3. #19
    root Member DanceswithUnix's Avatar
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    Re: Single Vs Dual Rank Memory

    Quote Originally Posted by ik9000 View Post
    ooh i would like ECC. Next build... (i say this every time)
    Currently hard to recommend for DDR5. I've not seen any Intel platforms support it. In the AMD camp, it is listed as a 7000 series feature, but currently doesn't work. On top of that, whereas DDR4 ECC needs to be 72 bit wide to correct errors on a 64 bit channel, DDR5 splits that into two 32 bit channels. Each of those requires 8 bits, so you end up with an 80 bit wide stick of ram. That, and the fact it's so damned new, it was double the price of standard already expensive DDR5.

    I'm hoping AMD pull their finger out and add AGAESA support for the eye wateringly expensive 64GB of ram in my last work build!

    Nice when it works though. From this workstation:

    Code:
    [root@dot ~]# edac-util -v
    mc0: 0 Uncorrected Errors with no DIMM info
    mc0: 0 Corrected Errors with no DIMM info
    mc0: csrow2: 0 Uncorrected Errors
    mc0: csrow2: mc#0csrow#2channel#0: 0 Corrected Errors
    mc0: csrow2: mc#0csrow#2channel#1: 0 Corrected Errors
    edac-util: No errors to report.

  4. #20
    Senior Member AGTDenton's Avatar
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    Re: Single Vs Dual Rank Memory

    So I've jinxed it by saying my memory was stable and had a BSOD Memory error earlier


    I've found these potentials:

    Kingston FURY Renegade KF436C16RB1AK4/64 DDR4-3600 CL16-20-20 1.35V @ £226.79 - Insight
    Annoyingly the datasheet doesn't mention rank...

    Corsair Vengeance RGB RT 32GB (2x16GB) DDR4 3600MHz C16-20-20-38 @ £208 @ Amazon
    I'd have to pray here that I get 2 of the same kit

    Team Group 8Pack Edition 32GB (2x16GB) DDR4 PC4-28800C16 3600 16-16-16-38 @ £280 Overclockers UK

    G.SKILL 32GB Trident Z Neo DDR4 3600MHz PC4-28800 CL16 (16-19-19-39) @ £283 Amazon EU
    Or £236 @ Amazon DE
    Last edited by AGTDenton; 22-02-2023 at 06:04 PM. Reason: Updated G.Skill price

  5. #21
    Moosing about! CAT-THE-FIFTH's Avatar
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    Re: Single Vs Dual Rank Memory

    Quote Originally Posted by AGTDenton View Post
    So I've jinxed it by saying my memory was stable and had a BSOD Memory error earlier


    I've found these potentials:

    Kingston FURY Renegade KF436C16RB1AK4/64 DDR4-3600 CL16-20-20 1.35V @ £226.79 - Insight
    Annoyingly the datasheet doesn't mention rank...

    Corsair Vengeance RGB RT 32GB (2x16GB) DDR4 3600MHz C16-20-20-38 @ £208 @ Amazon
    I'd have to pray here that I get 2 of the same kit

    Team Group 8Pack Edition 32GB (2x16GB) DDR4 PC4-28800C16 3600 16-16-16-38 @ £280 Overclockers UK

    G.SKILL 32GB Trident Z Neo DDR4 3600MHz PC4-28800 CL16 (16-19-19-39) @ £300 Amazon
    Those prices are ridiculous!

    Edit!!

    Read it as 32GB kits and not 64GB!!

  6. #22
    Senior Member AGTDenton's Avatar
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    Re: Single Vs Dual Rank Memory

    Ah yes, the price reflects 64GB.
    It looks like the 64GB kits are quite scarce or over priced. Mostly I have to choose 2x 32GB kits

  7. #23
    Senior Member AGTDenton's Avatar
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    Re: Single Vs Dual Rank Memory

    I've taken the plunge and gone with G.Skill from Amazon DE.
    Without import charges it would have been £198!!!

  8. #24
    root Member DanceswithUnix's Avatar
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    Re: Single Vs Dual Rank Memory

    Quote Originally Posted by AGTDenton View Post
    Ah yes, the price reflects 64GB.
    It looks like the 64GB kits are quite scarce or over priced. Mostly I have to choose 2x 32GB kits
    Didn't see this before. Did you try the memory companies direct?

    https://www.kingston.com/unitedkingd...0density=8gbit

    Those are apparently dual rank: https://www.kingstonmemoryshop.co.uk...s-non-ecc-dimm

    though cl16 at those speeds seems a push with two dimms per channel, not that I've tried...

  9. Received thanks from:

    AGTDenton (26-02-2023)

  10. #25
    Senior Member AGTDenton's Avatar
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    Re: Single Vs Dual Rank Memory

    Yes thanks I very nearly went for the Kingston, I kept bouncing between G.Skill & Kingston.

    Oddly the direct Kingston Price was more expensive last week which is why I ended up posting the Insight price.
    But now the Kingston direct prices are very good and on par with Corsairs!

    Reading a few posts on G.Skill swayed my decision.

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