I took a chance on eBay for a "for parts" Z220 system that included a CPU E3-1240 V2 @ 3.40GHz. I bid for the chassis and power supply and got it. Amazingly the processor worked so I got a great deal on it.
Anyway, the motherboard was dead but I put the processor in a SM X9SCL-M and gave it a go using the latest version of Lucas cpuminer-multi.
3 threads, 132 H/s
4 threads, 143 H/s, 37 watts (power_gadget), 68c (i7z)
5 threads, 120 H/s
7 threads, 125 H/s
8 threads, 120 H/s, 40 watts, 66c
It looks like 1*cores, threads/2, cache/2m wins again. I did notice that the OS would occasionally assign the worker threads to the same core and the processor would switch from a multiplier of 36 for 4 cores active to 37 for 3 cores active. I wonder if that extra turbo is kicking in on other tests and whether that makes any difference.
Anyway, the motherboard was dead but I put the processor in a SM X9SCL-M and gave it a go using the latest version of Lucas cpuminer-multi.
3 threads, 132 H/s
4 threads, 143 H/s, 37 watts (power_gadget), 68c (i7z)
5 threads, 120 H/s
7 threads, 125 H/s
8 threads, 120 H/s, 40 watts, 66c
It looks like 1*cores, threads/2, cache/2m wins again. I did notice that the OS would occasionally assign the worker threads to the same core and the processor would switch from a multiplier of 36 for 4 cores active to 37 for 3 cores active. I wonder if that extra turbo is kicking in on other tests and whether that makes any difference.
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