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Why so many builds?

Different CUDA versions support different hardware (compute capabilites), and different driver versions support different CUDA versions. As such, we need multiple builds to support all the various hardware/software combinations.
GPUSieveSize and older GPUs:
Older GPUs (all GTX 1xxx and older, and any with less than 8GB RAM) may have trouble running with the current default GPUSieveSize setting of 2047. If you have problems, set it to 128 in mfaktc.ini and try increasing it (256, 512, 1024). Higher values give slightly better performance at risk of lag (or crash) if the GPU has insufficient RAM.
Support thread: MersenneForum

Use mfaktc with AutoPrimeNet.

Which build do I use?

The one that matches (or is the closest less-than-or-equal-to) the CUDA version supported by your driver.
e.g. Driver supports CUDA 12.1, use the build that targets CUDA 12.0.

To check your driver's CUDA version, run nvidia-smi, which reports the supported CUDA version on the
first line (on driver 410.72 and newer1).
If your driver is older than that, consult this table.

Additional Linux builds: https://github.com/primesearch/mfaktc/releases/tag/0.24.0-beta.2.

File NameFile SizeDate ModifiedHash
mfaktc-0.24.0-beta.2-linux64-cuda11.4.3.zip1,077,1342025-04-2925885703e19dccfde5c97a2fa8b7c083
mfaktc-0.24.0-beta.2-linux64-cuda11.5.2.zip1,064,6232025-04-29a26940cb45f76203625ba618c0744a38
mfaktc-0.24.0-beta.2-linux64-cuda11.6.2.zip1,067,2542025-04-2900ea70abb1bbee1fbc6db67322f2c3e4
mfaktc-0.24.0-beta.2-linux64-cuda11.7.1.zip1,069,1932025-04-29fb067bce32c0483e49732c491e7f3224
mfaktc-0.24.0-beta.2-linux64-cuda11.8.0.zip1,173,9022025-04-299cb955b1c5df605f41c19c8c9555fec2
mfaktc-0.24.0-beta.2-linux64-cuda12.0.1.zip1,092,4112025-04-29c9f1b0dcba8f1f46a29e9fdfab2c3fc2
mfaktc-0.24.0-beta.2-linux64-cuda12.1.1.zip1,093,1702025-04-2950c64ef5e934ba8ff62c677e5ef7bd57
mfaktc-0.24.0-beta.2-linux64-cuda12.2.2.zip1,165,9792025-04-29d4046ca756c6d1ab8597f2f9c4a95744
mfaktc-0.24.0-beta.2-linux64-cuda12.3.2.zip1,178,7392025-04-2978b0dd92d6b08c5a210758ac003f86b5
mfaktc-0.24.0-beta.2-linux64-cuda12.4.1.zip1,164,8592025-04-297140cb6414a48898ef0315cd4b7e60f2
mfaktc-0.24.0-beta.2-linux64-cuda12.5.1.zip1,165,5272025-04-296a642d0dff5414e42aa4e07730bc1dc5
mfaktc-0.24.0-beta.2-linux64-cuda12.6.3.zip1,159,8502025-04-2933f809ff632848f85f7bd384f419cf84
mfaktc-0.24.0-beta.2-linux64-cuda12.8.1.zip1,348,1112025-04-291285136efd32a1881f5e6c67775c3956
Generated 9 May 2025 6:06am