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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 using the NVIDIA Control Panel, open the "Help" menu, "System Information", "Components" tab,
look for filename NVCUDA64.DLL (or NVCUDA32.DLL on 32-bit) in the left column, then in the right column ("Product Name") you
should see something like "NVIDIA CUDA 12.7.33 driver": the "12.7" is your CUDA version.
Another way to check is to run nvidia-smi (from a command prompt), which reports the supported CUDA version on the first line
(on driver 410.72 and newer1).

The below table shows the CUDA versions and recommended builds for some of the more popular driver versions:

Additional Windows builds: https://github.com/primesearch/mfaktc/releases/tag/0.23.2.


Driver Version CUDA Windows 64-bit Windows 32-bit Notes
R555+ (555.85 and later) 12.8+ mfaktc-0.23.2-win64-cuda12.8.0.zip
R525+ (525.xx and later) 12.0+ mfaktc-0.23.2-win64-cuda12.0.1.zip
R470 (470.xx to 475.xx) 11.4 mfaktc-0.23.2-win64-cuda11.4.4.zip last driver to support Kepler GPUs, Windows 7-8.1
R418 (418.xx to 425.xx) 10.1 mfaktc-0.23.2-win64-cuda10.0.130.zip last GeForce driver to support Kepler GPUs on Laptop
R390 (390.xx to 392.xx) 9.2 mfaktc-0.23.2-win64-cuda9.2.148.zip last driver to support Fermi GPUs, 32-bit OSs
R365
R367
(365.xx to 368.xx) 8.0 mfaktc-0.23.2-win64-cuda8.0.61.zip R365: last GeForce driver to support Windows Vista
R367: last GeForce driver to support Windows XP
R340 (340.xx to 342.xx) 6.5 mfaktc-0.23.2-win64-cuda6.5-CC11toCC50.zip mfaktc-0.23.2-win32-cuda6.5-CC11toCC50.zip last driver to support Telsa GPUs
R304 (304.xx to 309.xx) 5.0 mfaktc-0.23.2-win64-cuda5.0-CC11toCC35.zip mfaktc-0.23.2-win32-cuda5.0-CC11toCC35.zip last driver to support Curie GPUs, Windows XP on Laptop

File NameFile SizeDate ModifiedHash
mfaktc-0.23.2-win64-cuda8.0.61.zip734,9122025-03-04436ad6247f96e85719acab98ebc99ed4
mfaktc-0.23.2-win64-cuda10.0.130.zip884,4832025-03-040b50ae91b637c2894c18050571550446
mfaktc-0.23.2-win64-cuda9.2.148.zip821,4192025-03-0432b883d5eb7b24d959fd77e0ca3ccf01
mfaktc-0.23.2-win64-cuda11.0.1.zip866,4402025-03-04fc5963feee77900c0e6f2d739b1c2c89
mfaktc-0.23.2-win64-cuda11.1.1.zip921,4792025-03-046ab80e66313eca6214d871b1ba0f18c9
mfaktc-0.23.2-win64-cuda11.2.2.zip934,3132025-03-04188c9921af7de5dd09f723ea4d124224
mfaktc-0.23.2-win64-cuda11.3.1.zip941,3762025-03-04d0ad6b898af4302b9661a17742d88af2
mfaktc-0.23.2-win64-cuda11.4.4.zip972,3642025-03-0400e7d79880ac4b16668b5a1a43401b39
mfaktc-0.23.2-win64-cuda11.5.2.zip963,0272025-03-04df21797a8703cc19291a4ba7e763ec9c
mfaktc-0.23.2-win64-cuda11.6.2.zip964,0312025-03-04a02f580bfbbcee1b20d9b2b4a9b3a9c8
mfaktc-0.23.2-win64-cuda11.7.1.zip964,2072025-03-044567665c7f7f805c2b83087c6c844150
mfaktc-0.23.2-win64-cuda11.8.0.zip1,049,8542025-03-04520f138c7e7819c0f1ad2ea432c89544
mfaktc-0.23.2-win64-cuda12.0.1.zip991,5742025-03-04234a623ba27ec0281809235536405dbb
mfaktc-0.23.2-win64-cuda12.1.1.zip991,6572025-03-04d22b04ee20bb051eda1d1ee05d86e29f
mfaktc-0.23.2-win64-cuda12.2.2.zip994,1292025-03-04732174fefa6313d66dfc624db1599b25
mfaktc-0.23.2-win64-cuda12.3.2.zip1,002,2522025-03-043423c74f50690bbd2dceb76f96b483b9
mfaktc-0.23.2-win64-cuda12.4.1.zip993,6752025-03-04f70124ba63d86ce8f6cbd59371fe484f
mfaktc-0.23.2-win64-cuda12.5.1.zip993,8562025-03-04c8545aee177754f25412410ccb247b97
mfaktc-0.23.2-win64-cuda12.6.3.zip992,6182025-03-04926c9bb7f1ac06a534dd3cfafd9349ea
mfaktc-0.23.2-win64-cuda12.8.0.zip1,169,5002025-03-0468857d4653c81c8c8af9247818868aad
Generated 30 Mar 2025 9:39pm