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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.6.

File NameFile SizeDate ModifiedHash
mfaktc-0.24.0-beta.6-linux64-cuda11.6.2.zip1,051,3252025-08-20a025adb62231bb43c42ec10babff8e9d
mfaktc-0.24.0-beta.6-linux64-cuda11.7.1.zip1,057,1502025-08-203b3599ddc9d3305364a09b4ee5df73f5
mfaktc-0.24.0-beta.6-linux64-cuda11.8.0.zip1,158,7942025-08-204489dda1e708a5fa6eac53640d1d4a03
mfaktc-0.24.0-beta.6-linux64-cuda12.0.1.zip1,087,0012025-08-20d456dd8ff114835358027e910041c671
mfaktc-0.24.0-beta.6-linux64-cuda12.1.1.zip1,089,4722025-08-20de36608aa645f6815c38f3d252967a29
mfaktc-0.24.0-beta.6-linux64-cuda12.2.2.zip1,156,7402025-08-20e8626f17c79f3bbdc3ce1c9c7ba24c35
mfaktc-0.24.0-beta.6-linux64-cuda12.3.2.zip1,165,9482025-08-20f314c56667e1be7e6586a56a81ae080d
mfaktc-0.24.0-beta.6-linux64-cuda12.4.1.zip1,153,0492025-08-201ab50f5e44e04a04d653a2aea12b0c8f
mfaktc-0.24.0-beta.6-linux64-cuda12.5.1.zip1,153,7282025-08-20ddeceec7912d36041443511c1aeaae9b
mfaktc-0.24.0-beta.6-linux64-cuda12.6.3.zip1,148,4902025-08-2097af8dd8109a0f91f64d40c9c06f6534
mfaktc-0.24.0-beta.6-linux64-cuda12.8.1.zip1,333,5412025-08-20c9845639673f7423429ac0ebd65cd29e
mfaktc-0.24.0-beta.6-linux64-cuda12.9.1.zip1,447,2742025-08-2008ce5155aba8d7a50895c25b1a28d14d
mfaktc-0.24.0-beta.6-linux64-cuda13.0.0.zip1,027,2352025-08-202c969d5c3f3619cef9352cfe14b73aa9
Generated 9 Oct 2025 4:26am