Quote Originally Posted by D_A View Post
Average scores over the last 18days:

Opteron 185
2.6GHz
5103 average PPD
Linux 64bit (daily drive)

Opteron 170
2GHz
3763.9 average PPD
Linux 64bit (boy's daily drive)

Dual Sossaman
2GHz
6301 average PPD
Linux 32bit (also running caching web proxy, content filter and DNS forwarder for whole network)

Vapour: ... how did you work out the 4.0 for jcool's Sossa? The numbers in his post give me 0.99PPD/MHz From your first example you appear to be multiplying by the number of threads. If I do that, my Sossaman scores a 12.6 on your chart.
jcool's averages ~8000 points per 96hr of runtime....which comes to 4.0 PPD/MHz. Yours comes in at 3.15 PPD/MHz, but you're running a bunch of other stuff on it, so its numbers will be diluted.

I'm not surprised by Thuban...it's actually doing better than 1.5x a Deneb X4, but that could just be because of the small sample sizes and the taint of non-dedication.

Of all the numbers I think are undershooting real performance, I think it's Clarkdale. I'd expect Clarkdale to pull 4.1-4.5 PPD/MHz on a dedicated system (based on what other Nehalem derivatives do for PPD/MHz/core). The 3.8 PPD/MHz on the chart is from a single system used by multiple users....I hope I can get more data on Clarkdale soon

In terms of cost effectiveness, a Sossaman is going to be hard to beat ($120 for CPUs+board+ram+HSFs?), but that's largely because it uses outdated parts. Microcenter's occasional deal of $99 for board + Athlon X4 would vie for that title as well if you can find cheap RAM. As for power....it's something that's way too difficult to chart for all of this, nevermind obtaining comparable data. It's a project I'd be interested in seeing the results of, but it would have to be done by a single individual that knows scientific method (and overclocking and computer and electrical engineering fundamentals) that has a lot of time and doesn't mind sacrificing production to accurately chart low-clock, high-efficiency output.