Alright, I give up. The limitations between the lesser b-die, dated BIOS, and possibly memory controller are unavoidable. This is the best I can do without hitting constant BSODs or just failing stability tests instantly. Like, starts tossing up errors the moment I start prime95. It's a shame. I really feel like I
should be able to get just a little more out of this hardware. Maybe if ASUS ever figures out their troubles with AGESA, I can.
I did try 3200/CL14, but the performance is marginally worse, it's a slower 3200/CL14, if that makes sense. Actually just scores worse across the board. Maybe later I'll run it to show. What I'm posting here is basically the timings for that scaled up to what would perform the same at 3400, with that 66mhz speed bump. So I wind up with similar latency, but a little faster speed.
Maybe there's a better sweet spot in there. I can't find it, though. There's shockingly little between this specific config and which combinations of faster speeds/looser timings or slower speeds/tighter timings will actually be stable. A little nudge either way and stability drops off of a cliff :/ And it's always like I'm one step away. But 10 steps later nothing has changed.
There's no way it should ever be that touchy. I'm not exactly pushing for extremes. I'm really thinking it's the mobo. Maybe I just don't know enough yet. But I feel like something has to be missing here. The wall I'm hitting is too brutal. It took me a week to get to this point. :/ I dunno, maybe I'm expecting too much. I know 3600/CL17 b-die isn't the best. Don't get me wrong, either, it still performs great - probably much better than what most people out there have. I'm still happy with it. Just feels like kind of a letdown to be held back by something I just can't pin down, knowing there should be a way to go another rung up. One can only bang his head against the wall so much. I feel like I've done my time reading, tinkering, clearing CMOS, restoring backups.
Maybe one day I'll pick it up again. But right now I am soo over it
EDIT: Just for posterity. 3200/CL14...
No matter what I may do, timings do not get sufficiently tighter. And speeds don't get sufficiently faster at similar timings. I gain nothing past that 3466/CL16 config. If I could do something like a loose 3200/CL12 or even CL13 I might be thinking differently. I also tried for 3400/CL14 and even 3400/CL15, but never managed to get it stable.
Power is another factor... ...this 3466/CL16 config runs at 1.41v and 1.1 SoC. Anything performing better requires significantly more to post, let alone begin to pass stress tests. I played around with termination, secondary voltages, powerdown/geardown, everything. I started with the lowest reasonable voltage for both DRAM and SoC, going up in minimal increments. And I'm telling you, minimum SoC is like 1.15 or even higher, while DRAM needs to be close to or at 1.5v. Even if I could tweak the timings to make those faster, high-power configs stable, it's not worth the extra 5-7C in CPU temps for what is maybe a 2-5% RAM performance boost.
Just goes to show, there's a lot more to it than just speed and CAS latency. Seems the way to get the most out is to pick the specific speed/CL that lands you the best subtimings, with a reasonable balance of all three. It doesn't always make sense to shoot for the fastest speed you can do with the lowest possible primary timings because of sacrifices made elsewhere. There's a sweet spot for every hardware combo. Shooting for the sweet spots other people hit may be a misdirection.
Lesson here is to look at what YOU are seeing, not other people. If I did as people generally recommend and shot for those pretty low primary timings and slower speed, I'd be losing out in terms of overall speed:latency. And that's because the subtimings for my sticks to hit that are necessarily too loose. I can just as easily kick on geardown, up the primaries/speed, and hold tighter subtimings for better performance at absolutely no sacrifice to overall latency.
How this shakes down in specific applications is another question. And a much harder one to answer...
One thing I can say, and if anybody's curious I have my 3200/CL14 profile saved to run some more benchmarks, but CPU performance actually goes down measurably with that profile over my 3466/CL16 one.