How far will Prime95 trial-factor an exponent?


The how-far-to-TF limit is based on breakeven curves for CPU TF (highly! discouraged since ~2010) using Prime95ref, plus a fixed bitlevel offset for the increased efficiency of GPUs over CPUs (currently set to +4 bits = 16x)

Prime95PrimeNetMin ExponentMax Exponent
2402440999,999
2562601,000,0001,479,999
2572611,480,0001,929,999
2582621,930,0002,359,999
2592632,360,0002,949,999
2602642,950,0003,959,999
2612653,960,0005,159,999
2622665,160,0006,514,999
2632676,515,0008,249,999
2642688,250,00013,379,999
26526913,380,00023,389,999
26627023,390,00029,689,999
26727129,690,00038,299,999
26827238,300,00048,799,999
26927348,800,00060,939,999
27027460,940,00077,909,999
27127577,910,00096,829,999
27227696,830,000119,999,999
273277120,000,000153,399,999
274278153,400,000199,499,999
275279199,500,000253,499,999
276280253,500,000322,099,999
277281322,100,000408,399,999
278282408,400,000516,799,999
279283516,800,000661,999,999
280284662,000,000841,999,999
281285842,000,0001,070,999,999
2822861,071,000,000