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— | amd [2018/12/01 14:57] (current) – created - external edit 127.0.0.1 | ||
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+ | ====== AMD AM3+ FX ====== | ||
+ | ===== BIOS Remarks ===== | ||
+ | ==== Best tradeoff (speed, low power) ==== | ||
+ | **HPC Mode** Must be ON! If not CPU cannot reach full speed under load (bad multicore performance)\\ | ||
+ | **APM** Must be ON! If not Turbo Boost won't work (bad singlecore performance)\\ | ||
+ | |||
+ | ==== Best multicore (high power) ==== | ||
+ | **APM OFF** | ||
+ | |||
+ | --- | ||
+ | ==== Overclocking ==== | ||
+ | If it's in TDP limit everything is fine, but when you raise voltage you must turn off APM which guard TDP. | ||
+ | My advice -> don't raise voltage. | ||
+ | If APM is not disabled, CPU is throttling to stand in TDP. If disabled, power consumption reach high levels constantly. | ||
+ | |||
+ | ==== Sample Table ==== | ||
+ | Assume 3.5 GHz as base frequency | ||
+ | ^ HPC ^ APM ^ Remark ^ | ||
+ | | ON | ON | System running on 3.5 GHz, sometimes drops to 1.4 GHz (TDP) | | ||
+ | | OFF | ON | System running on 3.5 GHz, often drops to 2.9 GHz (TDP) | | ||
+ | | ? | OFF | System cannot use Turbo Core, running at 3.5 GHz with very high power usage | | ||
+ | C6, Cool n Quiet - always enabled there' | ||
+ | HPC Mode lock CPU in three states Turbo-boost, | ||
+ | |||
+ | ====== Microcode Update AM3+ ====== | ||
+ | Microcode update is hard and is located in -> **AmdProcessorInitPeim** <- UEFI block\\ | ||
+ | Can be edited directly via Hexa editor (pasting new code over approx 3kB size for newer CPUs)\\ | ||
+ | Tools: MMTool, UEFITool, MC Extractor | ||
+ | |||
+ | Sample -> Updated AMD microcode to 6000852 (Solved NMI bug and SPECTRE)\\ | ||
+ | {{: | ||
+ | [[https:// | ||
+ | ====== Cinebench ====== | ||
+ | {{: | ||
+ | |||
+ | ====== CryptoNight Performance ====== | ||
+ | 343.100 H/s | ||
+ | |||
+ | ====== Bulldozer / Piledriver Die ====== | ||
+ | 8-core FX-8xxx CPU have 4 modules so in fact this hurts performance.\\ | ||
+ | If you completely load two cores in one module performance is not 200%, but aprox. 160% (Fetch and FPU unit are shared between them).\\ | ||
+ | FPU unit can split into two pieces for most work, but have only one scheduler. L1 instruction cache is shared too\\ | ||
+ | 8-core performance gives you not 800% but approx. only 640% (little faster than natural 6 core CPU - Phenom II X6) in full load. | ||
+ | {{: | ||