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- Aug 9, 2019

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Processor | 7800X3D 2x16GB CO |
---|---|

Motherboard | Asrock B650m HDV |

Cooling | Peerless Assassin SE |

Memory | 2x16GB DR A-die@6000c30 tuned |

Video Card(s) | Asus 4070 dual OC 2610@915mv |

Storage | WD blue 1TB nvme |

Display(s) | Lenovo G24-10 144Hz |

Case | Corsair D4000 Airflow |

Power Supply | EVGA GQ 650W |

Software | Windows 10 home 64 |

Benchmark Scores | Superposition 8k 5267 Aida64 58.5ns |

So after building 4 setups with 7800X3D I find the variations in imc/fclk/CO fascinating:

All cpus are tested with Asrock B650m hdv bios 2.08. I used different psus, all gold 550-650W and 3 different aircoolers. The following actual SOC/VDDP is required for M-die 6000c30-35-35 480 rfc errorfree in TM5 with tight timings and best performing fclk:

Sample 1: 1.11v/1.0v 2167

Sample 2: 1.28v/1.12v 2133

Sample 3: 1.02v/0.95v (1.07v required for A-die 16GB DR ram) 2200

Sample 4: 1.02v/0.98v 2200

As for CO, I say avg negative CO achieved. This is tested with occt avx2 extreme. Daily stable for most cases is probably 2-5 negative better

Sample 1: -26

Sample 2: -41

Sample 3: -35

Sample 4: -28

I currently use sample 3, the others sit in different computers I build for friends. The imc in sample 2 is si bad that it needs mote SOC running 5600 (1.04v)than sample 3 and 4 needs for 6000. CO of sample 2 is really golden. Several cores runs -50 stable.

All cpus can run vddio at 1.2v and below with SR, the one using DR needs 1.24v vddio. All samples had to lower fclk above 1.25v SOC.

Silicon lottery varirs greatly

All cpus are tested with Asrock B650m hdv bios 2.08. I used different psus, all gold 550-650W and 3 different aircoolers. The following actual SOC/VDDP is required for M-die 6000c30-35-35 480 rfc errorfree in TM5 with tight timings and best performing fclk:

Sample 1: 1.11v/1.0v 2167

Sample 2: 1.28v/1.12v 2133

Sample 3: 1.02v/0.95v (1.07v required for A-die 16GB DR ram) 2200

Sample 4: 1.02v/0.98v 2200

As for CO, I say avg negative CO achieved. This is tested with occt avx2 extreme. Daily stable for most cases is probably 2-5 negative better

Sample 1: -26

Sample 2: -41

Sample 3: -35

Sample 4: -28

I currently use sample 3, the others sit in different computers I build for friends. The imc in sample 2 is si bad that it needs mote SOC running 5600 (1.04v)than sample 3 and 4 needs for 6000. CO of sample 2 is really golden. Several cores runs -50 stable.

All cpus can run vddio at 1.2v and below with SR, the one using DR needs 1.24v vddio. All samples had to lower fclk above 1.25v SOC.

Silicon lottery varirs greatly

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