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docs(idols-ai): record the mixed-memory freeze and current state (#433)
Assisted-by: DeepSeek Harness (gpt-6.1-sol, deepseek-flash)
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@@ -2,24 +2,26 @@
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128G from JUHOR 2×48G + GLOWY 2×16G. All four DIMMs are needed because 96G is insufficient.
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## Target configuration
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## Current configuration
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This is the settled configuration for normal use. It passed a **6-hour 100G stress test with 0
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errors** (highest sampled memory temperature: **56.8°C**) and then **29.6 hours of daily use over
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two nights and one workday**, displays on and off, LLM serving throughout. Keep these settings
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rather than increasing voltage further.
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CPU VDD2 is set to **1.17 V** (BIOS reads **1.168 V**). This is the best configuration tested so
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far, but it still froze during daily use on 2026-10-11. Keep it for normal use for now; higher
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tested VDD2 settings have not provided a stable alternative.
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| Field | Target |
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| ----------------------- | ------------------------- |
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| Field | Setting |
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| ----------------------- | -------------------------------------------- |
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| XMP | Disabled |
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| Gear mode | Gear2 |
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| Memory speed | 4800 MT/s |
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| CPU VDD2 | **1.17 V fixed** |
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| CPU VDD2 | **1.17 V fixed (BIOS reads 1.168 V)** |
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| VCCSA | Auto (BIOS reads 1.288 V) |
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| VDD2_MV (BIOS label) | Auto (BIOS reads 1.280 V) |
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| DRAM VDD | **1.28 V fixed** |
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| DRAM VDDQ | **1.28 V fixed** |
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| DRAM VPP | Auto (1.8 V) |
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| tCL / tRCD / tRP / tRAS | 40 / 40 / 40 / 77 |
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| tCL / tRCD / tRP / tRAS | 40 / 40 / 40 / 77 (last photographed values) |
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Voltage settings and readings come from BIOS and user reports, not OS measurements.
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## Hardware
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@@ -41,47 +43,56 @@ Earlier attempts starting with the 48G pair or all four DIMMs did not reach BIOS
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2. Enter BIOS and disable XMP.
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3. Power off and add the 2×48G in DIMM0.
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4. Allow 1 to 3 minutes for retraining, possibly with several reboots.
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5. Apply the target settings above.
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5. Apply the current settings above.
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If failed training prevents BIOS entry, repeat this order; clear CMOS first if necessary. Failed
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training can silently restore defaults; re-check settings in BIOS afterwards.
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## Test results
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Earlier DRAM tests used CPU VDD2 Auto (BIOS reading 1.104 V). **Bold values identify the rails
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changed in each test.**
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CPU VDD2 entries below are BIOS settings: Auto read 1.104 V in the earlier DRAM tests; the 1.17 V
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setting reads 1.168 V. These BIOS readings are not measurements during the OS tests.
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| CPU VDD2 | DRAM VDD | DRAM VDDQ | Result | Highest sampled memory temperature |
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| ---------- | ------------------------ | ------------------------ | ------------------------------------------------------------ | ---------------------------------- |
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| Auto | **1.10 V** | **1.10 V** | Immediate freezes during memory tests, even 4G. | Not recorded |
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| Auto | **1.25 V** | **1.25 V** | 8G / 32G / 100G short tests passed; llama.cpp load froze. | Not recorded |
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| Auto | **1.28 V** | **1.28 V** | 100G short test passed; daily use froze twice on 2026-10-08. | Not recorded |
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| Auto | **1.282 V** | **1.282 V** | Display corruption in BIOS. | Not recorded |
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| Auto | **1.29 / 1.30 / 1.32 V** | **1.29 / 1.30 / 1.32 V** | Each setting failed training. | Not recorded |
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| **1.13 V** | 1.28 V | 1.28 V | BIOS normal; no long test. | Not recorded |
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| **1.15 V** | 1.28 V | 1.28 V | 100G, 15 minutes: PASS. | 45.5°C* |
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| **1.15 V** | 1.28 V | 1.28 V | Long test froze; last saved duration: 21 minutes 17 seconds. | 56.5°C |
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| **1.17 V** | 1.28 V | 1.28 V | 100G, **6 hours: PASS**. | **56.8°C** |
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| **1.17 V** | 1.28 V | 1.28 V | **2 nights + 1 workday: no freeze**, displays on and off. | Not recorded |
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| **1.20 V** | 1.28 V | 1.28 V | BIOS display corruption and freeze within 10 to 20 seconds. | Not recorded |
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| CPU VDD2 | DRAM VDD | DRAM VDDQ | Result | Highest sampled DIMM temperature |
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| ---------- | -------------------- | -------------------- | ------------------------------------------------------------------------------------------------------ | ---------------------------------------------- |
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| Auto | 1.10 V | 1.10 V | Immediate freezes during memory tests, even 4G. | Not recorded |
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| Auto | 1.25 V | 1.25 V | 8G / 32G / 100G short tests passed; llama.cpp load froze. | Not recorded |
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| Auto | 1.28 V | 1.28 V | 100G short test passed; daily use froze on 2026-10-08. | Not recorded |
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| Auto | 1.282 V | 1.282 V | Display corruption in BIOS. | Not recorded |
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| Auto | 1.29 / 1.30 / 1.32 V | 1.29 / 1.30 / 1.32 V | Each setting failed training. | Not recorded |
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| 1.13 V | 1.28 V | 1.28 V | BIOS normal; no long test. | Not recorded |
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| 1.15 V | 1.28 V | 1.28 V | 100G, 15 minutes: PASS. | 45.5°C* |
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| 1.15 V | 1.28 V | 1.28 V | Long test froze; last saved duration 21 min 17 s. | 56.5°C |
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| **1.17 V** | **1.28 V** | **1.28 V** | **100G, 6 hours: PASS, 0 errors or hardware incidents.** | **56.8°C** |
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| 1.17 V | 1.28 V | 1.28 V | About 56 hours across three boots ending cleanly; next boot froze during LLM serving (2026-10-11). | 47.2°C in the last available monitoring sample |
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| 1.20 V | 1.28 V | 1.28 V | Earlier attempt: BIOS display corruption and freeze within 10 to 20 s. | Not recorded |
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| 1.20 V | 1.28 V | 1.28 V | 100G test froze with screen corruption; last saved duration 7 min 23 s (2026-10-11). | 55.25°C |
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| 1.18 V | 1.28 V | 1.28 V | 100G test froze with screen corruption; last saved duration 14 min 36 s (2026-10-11). | 59.5°C |
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| 1.28 V | 1.28 V | 1.28 V | Reached the desktop, then froze; journal spans 16:30:16 to 16:31:20 (64 s). No recorded pressure test. | Not recorded |
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| 1.30 V | 1.28 V | 1.28 V | Set in BIOS only; rolled back without booting or testing. | Not tested |
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| **1.17 V** | **1.28 V** | **1.28 V** | **100G, 15 minutes: PASS, 0 errors or hardware incidents (2026-10-11 17:29–17:45).** | **59.25°C** |
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*The 15-minute test used sparse temperature samples; its true peak is unknown. Long tests sampled
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about every 5 seconds and used a 60°C stop threshold.
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*The 1.15 V short test used sparse temperature samples; its true peak is unknown. The monitored long
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tests and the 2026-10-11 100G tests sampled about every 5 seconds with a 60°C stop threshold. Saved
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durations are lower bounds on time before interruption, not exact freeze times.
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Both recent long tests were on 2026-10-09:
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The passing 1.17 V test ran on 2026-10-09 from 01:29 to 07:30 without swap use. Subsequent daily use
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included displays on and off with LLM serving. Sleep/wake is untested.
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- At 1.15 V, the last record was at 01:02, with machine uptime of 1 hour 53 seconds. The saved
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durations are lower bounds, not exact freeze times.
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- At 1.17 V, the test ran from 01:29 to 07:30, with 0 errors or hardware incidents and no swap use.
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Recorded temperatures stayed below 60°C.
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The 1.17 V freeze on 2026-10-11 ended logging at 13:55:46, about 4 h 47 min after boot. Logs stopped
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during generation without a shutdown sequence or a recorded machine check, BUG or Oops.
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## Daily use
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## BIOS limitations and conclusion
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One unbroken boot, 2026-10-09 01:24 to 2026-10-10 07:02: the 6-hour test and a workday with the
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displays on, then a night with them off. Load stayed high — 100G stress test, then continuous LLM
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serving with the KV cache streaming from RAM — and occupancy stayed around 70% or more.
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Attempts to apply tRFC 1180 and primary timings 42 / 42 / 42 / 82 reverted automatically after
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saving, according to the user's BIOS checks. Those relaxed settings never became a tested
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configuration. The memory frequency control is also locked at 4800 MT/s in the current BIOS setup.
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The table above retains the last photographed timings; a later readback has not been recorded.
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No machine check, hardware error, BUG, Oops, or GPU fall-off; no OOM or hung task; no log gap over
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60 seconds. Sleep/wake is untested — displays off only blanks them. Occupancy and temperature were
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not logged and the board has no EDAC counters, so an error would show up as a freeze or corruption,
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not a count.
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Keep CPU VDD2 at 1.17 V and DRAM VDD/VDDQ at 1.28 V for now. The passing stress test and daily-use
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record make this the best tested option, but the later freeze means stability remains unresolved.
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The user reports a possible ambient temperature rise of about 10°C. Temperature may affect the
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remaining margin, but neither temperature nor an IMC, DIMM or motherboard fault has been isolated.
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Manual timing relaxation and frequency reduction are currently unavailable; further tuning is
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paused. Revisit only if freezes continue or those BIOS controls become usable.
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