Description | Resolution | Image | Video | |
---|---|---|---|---|

Known factor bit depths for all exponents less than 2^{32} (up to M4,294,967,295) | 4296x1000 | factor_bits_20240518.png filesize: 183kB | video.mp4 filesize: 16.6MB 2024-May-12 | |

Known factor bit depths for active PrimeNet range (up to M191,999,999) | 1920x1000 | factor_bits_100M_20240518.png filesize: 164kB | video.mp4 filesize: 17.7MB 2024-May-12 | |

Known factor bit depths for active PrimeNet range (up to M383,999,999) | 3840x1632 | factor_bits_384M_20240518.png filesize: 387kB | video.mp4 filesize: 43.1MB 2024-May-12 | |

Known factor bit depths for entire PrimeNet range (up to M999,999,999) | 1000x500 | factor_bits_1000M_20240518.png filesize: 40kB | video.mp4 filesize: 4.9MB 2024-May-12 | |

Known factor bit depths for entire mersenne.ca range (up to M9,999,999,999) | 10000x2000 | factor_bits_10G_20240518.png filesize: 466kB | video.mp4 filesize: 15.7MB 2024-May-12 | |

Known factor bit depths for PrimeNet wavefront (50M to 146M) | 960x480 | factor_bits_wavefront_20240518.png filesize: 51kB | video.mp4 filesize: 5.0MB 2024-May-12 | |

Known factor bit depths for PrimeNet wavefront (100M to 196M) | 960x480 | factor_bits_wavefront2_20240518.png filesize: 46kB | video.mp4 filesize: 4.7MB 2024-May-12 |

Back in the Ancient Times, before GPUs did computing, Prime95 had a default TF limit based on the break-even probability of proving an exponent composite by factoring or LL. When mfaktc came around that up-ended things and TF became much faster. Spearheaded by the GPU72 project, the TF target was initially raised +2 then +3 bit levels above the previous Prime95 CPU target. After some years when GPUs became even more ridiculously fast and widespread, the target was raised to +4 and there was talk of +5, although we backed off that and are working at +4 for the last long while now. So, for historical reasons that go back anywhere from 10 to 25+ years, the 3 lines on the graph are:

- pink = CPU target
- blue = old GPU target (+3)
- cyan = GPU upper limit (+5)

The blue line really should be at +4, and the cyan one might come into play if there's a surfeit of GPU power and people decide to go "one bit further" than target just because they can.