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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/0.24.0-beta.2.


Driver Version CUDA Windows 64-bit Windows 32-bit Notes
R555+ (555.85 and later) latest mfaktc-0.24.0-beta.2-win64-cuda12.8.1.zip
R470 (470.xx to 475.xx) 11.4 mfaktc-0.24.0-beta.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-0.24.0-beta.2-win64-cuda10.0.130.zip last GeForce driver to support Kepler GPUs on Laptop
R390 (390.xx to 392.xx) 9.1 mfaktc-0.24.0-beta.2-win64-cuda9.0-CC30toCC70.zip mfaktc-0.24.0-beta.2-win32-cuda9.0-CC30toCC70.zip last driver to support Fermi GPUs, 32-bit OSs
R365
R367
(365.xx to 368.xx) 8.0 mfaktc-0.24.0-beta.2-win64-cuda8.0.61.zip mfaktc-0.24.0-beta.2-win32-cuda8.0-CC20toCC62.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-0.24.0-beta.2-win64-cuda6.5-CC11toCC50.zip mfaktc-0.24.0-beta.2-win32-cuda6.5-CC11toCC50.zip last driver to support Tesla GPUs
R304 (304.xx to 309.xx) 5.0 mfaktc-0.24.0-beta.2-win64-cuda5.0-CC11toCC35.zip mfaktc-0.24.0-beta.2-win32-cuda5.0-CC11toCC35.zip last driver to support Curie GPUs, Windows XP on Laptop

File NameFile SizeDate ModifiedHash
mfaktc-0.24.0-beta.2-win64-cuda9.0-CC30toCC70.zip599,9302025-05-09aec21ae1ec848bf1d4a6d6028204ce74
mfaktc-0.24.0-beta.2-win64-cuda8.0-CC20toCC62.zip535,1912025-05-091e27a772b0c5df9c3f3618b63ae0f2b4
mfaktc-0.24.0-beta.2-win64-cuda6.5-CC20toCC50.zip390,0282025-05-09f6e3bf2b9a615b8e68262ef8668d1679
mfaktc-0.24.0-beta.2-win64-cuda6.0-CC20toCC50.zip383,8302025-05-09e7c31901886138e7217b04e50231a93a
mfaktc-0.24.0-beta.2-win64-cuda8.0.61.zip793,0452025-04-29586e9d9134d626164c06be495739d212
mfaktc-0.24.0-beta.2-win64-cuda9.2.148.zip917,9442025-04-29a98e2cda31ce0737f967604d3c54ae1a
mfaktc-0.24.0-beta.2-win64-cuda10.0.130.zip969,3842025-04-296901f63ca0f355af5ca3b8949b32e39f
mfaktc-0.24.0-beta.2-win64-cuda11.0.1.zip947,9002025-04-29c11a9656c2aef47ff7ee024dea1607cb
mfaktc-0.24.0-beta.2-win64-cuda11.1.1.zip1,008,8612025-04-299d5b9c92e390acd901c896ba07b21aac
mfaktc-0.24.0-beta.2-win64-cuda11.2.2.zip1,019,9222025-04-297342f89d9cbf242795a628664a6018fb
mfaktc-0.24.0-beta.2-win64-cuda11.3.1.zip1,016,6662025-04-29904fc82aea8113cf46481a1a4973f191
mfaktc-0.24.0-beta.2-win64-cuda11.4.4.zip1,059,4252025-04-2969b035dac61d12ab436f8052a52b8f65
mfaktc-0.24.0-beta.2-win64-cuda11.5.2.zip1,043,2742025-04-299e3ddd97d6c73bbd16aff16e9e6cb232
mfaktc-0.24.0-beta.2-win64-cuda11.6.2.zip1,044,1562025-04-2910e3b00f012ab3e3b7fcf38af4c3fdae
mfaktc-0.24.0-beta.2-win64-cuda11.7.1.zip1,043,2012025-04-29539a16397bafdd8a7b4fa97456aa0dd0
mfaktc-0.24.0-beta.2-win64-cuda11.8.0.zip1,144,0222025-04-299b400ddd9cda370eb448f2cc1a11d1b8
mfaktc-0.24.0-beta.2-win64-cuda12.0.1.zip1,066,6842025-04-290e0518c0b3ceb790c4286859b98718a0
mfaktc-0.24.0-beta.2-win64-cuda12.1.1.zip1,067,1212025-04-2957695a118a55c3f5c911a8824a3656ea
mfaktc-0.24.0-beta.2-win64-cuda12.2.2.zip1,069,9342025-04-2909dd196654cdb8f3e12dc473a36f7689
mfaktc-0.24.0-beta.2-win64-cuda12.3.2.zip1,077,5942025-04-29bb6960c4dc191699f0014ba7ae1192ba
mfaktc-0.24.0-beta.2-win64-cuda12.4.1.zip1,059,6642025-04-295ddc588fa660af60cd42702bc4cf1c5e
mfaktc-0.24.0-beta.2-win64-cuda12.5.1.zip1,059,8312025-04-29da41c94e78a994535d90550cdf29da47
mfaktc-0.24.0-beta.2-win64-cuda12.6.3.zip1,053,4392025-04-29c9c3f5ede971737f16caf2ebf83ae99b
mfaktc-0.24.0-beta.2-win64-cuda12.8.1.zip1,237,1062025-04-29cb7a568ed64d911970a09b5313e3f27e
Generated 18 May 2025 5:07am