SuperPi loves tight timings, which is what you ran with 6-7-5-15-1T. FatalOne probably had C7 or slower it seems.
No clue what RAM timings he had (or what NB speeds he had), but SuperPi also loves cache more than it loves system memory, especially when the working set is small (1M). My 1M times were never better than 20s, even on "suicide" runs in the 3.85 ghz range, which was clearly inferior to the "16s club" times a lot of the XS posters w/ Phenom IIs were/are getting. No matter how much I worked on my NB speeds and system memory speeds/timings, getting SuperPi 1M lower than 20s just wasn't happening. The lack of L3 cache really hurt there.
When I increased the size of the working set (32M), cache stopped mattering as much and system memory started mattering more. It's easier to get low system memory latency on K10 when you have no L3.
Would gaming/enconding stand to gain anything on tighter timings on the AM3 platform as well? I'm stuck at 9-9-9-32-1t wondering if a few new sticks of DDR3 would do any good.
Survey says: probably. Running tighter timings is a bit like increasing your NB speed: it should reduce latency and increase bandwidth. Now, the question is: how much good would it do? That much we can not answer, since K10 memory controllers are a finicky lot. Corsair Dominators/Dominator GTs would probably be an upgrade, but who wants to spend that kind of money on memory? If I had to go out there and point to some el-cheapo DDR3 and say "yeah, you can hit CAS6 with that", I would be blowing smoke since I can't make any guarantees. $199 DDR3-2200 got me CAS6 at DDR3-1600, sort of, but thanks to the IMC on my 635, it wasn't any better than that, and multiplier hell conspired to limit my top overclocks to DDR3-1520 anyway. That chip clearly needed more NB multipliers.
haha you plus a 25 dollar chip?? Experiment time. C2 isn't so bad, that's a steal NIB. Interested to see if you get that third and fourth core myself, I've yet to have any luck unlocking an athy/phenom

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The Sempron 140s are actually single-core chips that are "failed" Athlon II x2s. They are the chips with 1MB L2/core that have no third or fourth core. So, if it unlocks, it'll be a dual-core, nothing more, nothing less. But these things usually retail for $35 so it was a steal.
This chip will probably not live long. All it needs to do is last long enough for a BIOS update to enable Thuban support.
Thread needs more underlined text! And more cowbell, stat!
Ask, and ye shall receive.