Some more stats for people to have fun with:

aws cc2.8xlarge,
primecoin-0.1.1-hp5 native

2013-07-19 06:03:07 primemeter  79132085 prime/h 688566896 test/h      2040 5-chains/h
2013-07-19 06:04:07 primemeter  79653622 prime/h 698384521 test/h      2700 5-chains/h
2013-07-19 06:05:07 primemeter  79337338 prime/h 695558447 test/h      2040 5-chains/h
2013-07-19 06:06:07 primemeter  79792250 prime/h 695628406 test/h      1560 5-chains/h
2013-07-19 06:07:07 primemeter  80470419 prime/h 705139328 test/h      2280 5-chains/h
2013-07-19 06:08:07 primemeter  80764354 prime/h 704518758 test/h      1980 5-chains/h
2013-07-19 06:09:07 primemeter  76383887 prime/h 667428216 test/h      1500 5-chains/h


avg 5-chains/h ~~ 2000

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aws cc2.8xlarge,
primecoin-0.1.1-hp5 two changes:

1) prime.cpp
const unsigned int nPrimes = (uint64)nTotalPrimes * 8 / 100;  // down from 10

2) main.cpp
static const unsigned int nPrimorialHashFactor = 9; // up from 7

2013-07-19 06:12:12 primemeter  52307908 prime/h 395403610 test/h      2640 5-chains/h
2013-07-19 06:13:12 primemeter  56580497 prime/h 440204443 test/h      2820 5-chains/h
2013-07-19 06:14:12 primemeter  56291842 prime/h 438057079 test/h      3000 5-chains/h
2013-07-19 06:15:12 primemeter  56267549 prime/h 437380981 test/h      2100 5-chains/h
2013-07-19 06:16:12 primemeter  56236005 prime/h 432883711 test/h      2580 5-chains/h
2013-07-19 06:17:12 primemeter  54281275 prime/h 412524505 test/h      2580 5-chains/h
2013-07-19 06:18:12 primemeter  54689509 prime/h 419307812 test/h      2220 5-chains/h

avg 5-chains/h ~~ 2500