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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:


Driver Version CUDA Windows 64-bit Windows 32-bit Notes
R555+ (555.85 and later) 12.5+ mfaktc-0.23.0-win64-cuda12.5-CC50toCC90.zip
R525+ (525.xx and later) 12.0+ mfaktc-0.23.0-win64-cuda12.0-CC50toCC90.zip
R470 (470.xx to 475.xx) 11.4 mfaktc-0.23.0-win64-cuda11.0-CC35toCC80.zip last driver to support Kepler GPUs, Windows 7-8.1
R418 (418.xx to 425.xx) 10.1 mfaktc-0.23.0-win64-cuda10.0-CC30toCC75.zip last GeForce driver to support Kepler GPUs on Laptop
R390 (390.xx to 392.xx) 9.1 mfaktc-0.23.0-win64-cuda9.0-CC30toCC70.zip mfaktc-0.23.0-win32-cuda9.0-CC30toCC70.zip last driver to support Fermi GPUs, 32-bit OSs
R365
R367
(365.xx to 368.xx) 8.0 mfaktc-0.23.0-win64-cuda8.0-CC20toCC62.zip mfaktc-0.23.0-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-0.23.0-win64-cuda6.5-CC11toCC50.zip mfaktc-0.23.0-win32-cuda6.5-CC11toCC50.zip last driver to support Telsa GPUs
R304 (304.xx to 309.xx) 5.0 mfaktc-0.23.0-win64-cuda5.0-CC11toCC35.zip mfaktc-0.23.0-win32-cuda5.0-CC11toCC35.zip last driver to support Curie GPUs, Windows XP on Laptop

File NameFile SizeDate ModifiedHash
mfaktc-0.23.0-win64-cuda5.0-CC11toCC35.zip513,3182024-12-29c4424ae587ec1e5aeb880c7b81ba3fce
mfaktc-0.23.0-win64-cuda6.0-CC11toCC50.zip416,4052024-12-2943874900bfbb834cc2fbfb45b11a00ef
mfaktc-0.23.0-win64-cuda6.5-CC11toCC50.zip421,4342024-12-29417581a1f48494f45e982bdeacebbf71
mfaktc-0.23.0-win64-cuda8.0-CC20toCC62.zip503,6672024-12-291546e15cb46e0a8d92745fc02a876fe8
mfaktc-0.23.0-win64-cuda10.0-CC30toCC75.zip696,1062024-12-2989bb68820965feff6ad4bff9c603ebb4
mfaktc-0.23.0-win64-cuda9.0-CC30toCC70.zip560,5702024-12-29c18a0237e7eff4eca267c9d8509a8208
mfaktc-0.23.0-win64-cuda11.0-CC35toCC80.zip698,7232024-12-2967cef540ac2afbccabcdc5dad4763e9d
mfaktc-0.23.0-win64-cuda12.0-CC50toCC90.zip835,1422024-12-29c66b10fd5dda341175991a19da5f3eb9
mfaktc-0.23.0-win64-cuda12.5-CC50toCC90.zip869,1732024-12-29a398f6cbd4ef942a14d8bf8eef1b7e31
Generated 21 Jan 2025 7:40am