Also, in case anyone is curious
24-core Opteron 6164HE 1.7GHz:
"chainspermin" : 29,
"chainsperday" : 1.67533939,
"primespersec" : 8389,
32-core Opteron 6274 2.2GHz:
"chainspermin" : 12,
"chainsperday" : .71721642,
"primespersec" : 7039,
From PassMark and the opteron wiki page:
http://www.cpubenchmark.net/cpu_list.phphttp://en.wikipedia.org/wiki/List_of_AMD_Opteron_microprocessorsDual CPU, 12-core opteron 6164HE's PassMark CPU result: 5351/ea, 5351*2 = 10702 ||| Cache arrangement; L2: 12x 512 KB L3: 2x 6 MB
[Dual CPU] AMD Opteron 6274 PassMark CPU result: 10809 (inclusive of both) ||| Cache arrangement; L2: 8x 2MB L3: 2x 8 MB
If I had to guess, the dual cpu, 16 core setup (6274's) is slower because it shares one unit of L2 cache between two cores. The HE's have dedicated L2 for every core.
Despite the disappointing(?) performance, those are still all nice systems and I would mine on them any day.