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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.5.

File NameFile SizeDate ModifiedHash
mfaktc-0.24.0-beta.5-linux64-cuda10.2.zip950,7532025-06-18fb2bbffaf38b13adcc94d3011b11dc56
mfaktc-0.24.0-beta.5-linux64-cuda8.0.zip753,2772025-06-18118e574aed2c3eb5805dd8044abb676f
mfaktc-0.24.0-beta.5-linux64-cuda9.2.zip880,6612025-06-186a2f2faff1d1f0379f31616905243074
mfaktc-0.24.0-beta.5-linux64-cuda11.0.3.zip940,6712025-06-18883f505c38216661764ad64e0a3bb9f4
mfaktc-0.24.0-beta.5-linux64-cuda11.1.1.zip1,011,7572025-06-1869f78dea1db39538d02e89bf83d1aeb5
mfaktc-0.24.0-beta.5-linux64-cuda11.2.2.zip1,012,0482025-06-180ce523453ca95ffbf859b89b879a3fe9
mfaktc-0.24.0-beta.5-linux64-cuda11.3.1.zip1,018,0152025-06-1865d9bdd913d64ba94cf783013189b839
mfaktc-0.24.0-beta.5-linux64-cuda11.4.3.zip1,060,4882025-06-18257fec0e1f6f11d29e80b342a7ef83e0
mfaktc-0.24.0-beta.5-linux64-cuda11.5.2.zip1,048,0602025-06-1820304b50df41b42f16d1ed865973828d
mfaktc-0.24.0-beta.5-linux64-cuda11.6.2.zip1,049,8742025-06-182f5071c9e7999dbe7ad7bf51efde34de
mfaktc-0.24.0-beta.5-linux64-cuda11.7.1.zip1,056,0922025-06-18b47b8693386b52f48822424f1ed82a4a
mfaktc-0.24.0-beta.5-linux64-cuda11.8.0.zip1,157,7792025-06-188edc920b064cac8a5c7c1a7854aa4c05
mfaktc-0.24.0-beta.5-linux64-cuda12.0.1.zip1,078,4882025-06-18e006bc913b40220a820fb3f20cd251ea
mfaktc-0.24.0-beta.5-linux64-cuda12.1.1.zip1,078,3442025-06-18fb861e57e5683b62cc33792f8be54959
mfaktc-0.24.0-beta.5-linux64-cuda12.2.2.zip1,152,1932025-06-180386769f50c7a54ee1c1cff91219cfb5
mfaktc-0.24.0-beta.5-linux64-cuda12.3.2.zip1,165,4552025-06-18f0755d6d167d45452a9bddb624621250
mfaktc-0.24.0-beta.5-linux64-cuda12.4.1.zip1,147,5592025-06-185bc4154001f50870e56dce0e1a6f5469
mfaktc-0.24.0-beta.5-linux64-cuda12.5.1.zip1,149,1132025-06-1801238263f5fcf1c7559ccec69872d80f
mfaktc-0.24.0-beta.5-linux64-cuda12.6.3.zip1,143,2402025-06-18ec2828269ac10ffbd240178f9bf17300
mfaktc-0.24.0-beta.5-linux64-cuda12.8.1.zip1,327,2122025-06-1831d0fdb97d62f09fab4f598379f5b2a4
mfaktc-0.24.0-beta.5-linux64-cuda12.9.0.zip1,442,8452025-06-18cf734875d21179c454c1a2025c4283b1
Generated 22 Jun 2025 3:41pm