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    ROG Guru: Brown Belt Array gupsterg PC Specs
    gupsterg PC Specs
    MotherboardAsus Maximus VII Ranger
    Processori5 4690K
    Memory (part number)HyperX Savage 2400MHz 16GB
    Graphics Card #1Sapphire R9 Fury X (1145/545 Custom ROM)
    MonitorAsus MG279Q
    Storage #1Samsung 840 Evo 250GB
    Storage #2HGST 2TB
    CPU CoolerThermalRight Archon SB-E X2
    CaseSilverstone Temjin 06
    Power SupplyCooler Master V850
    Headset/Speakers HyperX Cloud
    OS Win 7 Pro x64 / Win 10 Pro x64
    gupsterg's Avatar
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    Feb 2015
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    So I now have a R9 3900X as well and this is a FCLK Clock Edition .

    Initially I set 3800MHz 1:1:1 (FCLK:UCLK:MEMCLK) on the R9 3900X as I would on the R5 3600.

    ProcODT 43.6,
    VDIMM 1.35V
    VTTDDR 0.675V
    SOC 1.062V
    CLDO_VDDP 0.927V
    CLDO_VDDG 0.980V

    This failed Kahru RAM Test 8% . I bumped ProcODT to 48 and failed Kahru RAM Test 80% . Again I bumped ProcODT, went 53 and Kahru RAM Test upto 460% and failed at 607% .

    As the R9 3900X was having a greater load line effect than than the single die R5 3600 & R7 3700X I decided to bump SOC/CLDO_VDDP/CLDO_VDDG a step each and now at ~1313% and counting .

    When I targeted 3800MHz on my R5 3600 I found out which slots on my mobo favored which dimms. This held true also for the R7 3700X, ie same dimms favored same slots, it also seems the R9 3900X is the same also.

    R9 3900X Kahru RAM Test screenie album, link. I'm using the beta 0002 UEFI with Combo-AM4 1.0.04B.
    Intel Defector AMD Rebel

    TR 1950X - Custom WC - Asus Zenith Extreme Alpha - G.Skill Trident Z 3400MHz C14 QC - RX VEGA 64
    R5 3600 - Custom WC - Asus Crosshair VII Hero Wifi - G.Skill Ripjaws V 3800MHz C16 - Sapphire HD 5850 Toxic

    24/7 OC: i5 4690K @ 4.9GHz CPU@1.255v 4.4GHz Cache@1.10v - Archon SB-E X2 - Asus Maximus VII Ranger
    Sapphire Fury X (1145/545 ~17.7K GS 3DM FS)

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