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ATXNG

Bench notes on desktop platform tuning

Reference

Platform coverage and required instruments, per note. Use it to work out what you can follow with the equipment already on your desk.

NotePlatformsInstruments
DDR5 subtiming tuning on AM5 and LGA1700AM5 / X670ELGA1700 / Z790DDR5 UDIMMHynix A-die / M-dieZenTimings / ASRock Timing ConfiguratorTestMem5 and Karhu RAMTestIntel MLCspd5118 module temperature sensor
PCIe lane topology, bifurcation and link verificationAM5 / X670ELGA1700 / Z790PCIe 4.0/5.0 riserspciutils 3.13 (lspci, setpci)rasdaemonfionvme-cli
VRM load line, droop and thermal analysisAM5 / X670ELGA1700 / Z790multiphase buck VRM100 MHz oscilloscope4½-digit DMMK-type thermocoupleDC clamp meter
Per-core Curve Optimizer: finding each core's voltage floorAM5 / X670ERyzen 7000 / 9000LGA1700 / Z790turbostat (APERF/MPERF)CoreCycler + Prime95y-cruncherrasdaemon
UEFI firmware inspection, modification and recoveryIntel Z790 / LGA1700AMD X670E / AM5W25Q128 SOIC-8 SPI NORCH341A programmer (3.3 V)Raspberry Pi + spidevSOIC-8 test clipmultimeter