20200307, 17:42  #12  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
2^{3}·7·61 Posts 
Quote:
DC can be either LL or PRP. There is a several year backlog of LL DC and growing. There is a need for more PRP DC on which to base an estimate of PRP in the wild total error rate. Before gpu TF, factoring depth was less by default for the same exponent than it is now. One can make a case for additional bit levels of factoring that may eliminate the need for a double check, in those cases. Before first time primality testing, finding a factor saves the first primality test and the double check primality test (and the occasional third and fourth or more). After first time primality testing, further trial factoring if any is weighed against the double check and occasional third or higher check. When the state of the trial factoring software art or hardware efficiency changes, the optimal tradeoff of trial factoring versus double checking effort shifts. There is a several year backlog of LL double check, and some of PRP double check. The introduction of GPU TF raised the ideal TF bit level by about 4. The RTX20xx and GTX16xx are enough more efficient at TF that they raise the ideal TF bit level one more. To put it another way, the ratio of TF to primality or P1 Ghd/day ratings is typically about 0.7 to 1.4 on cpus. On gpus, it's 10. to 40. or so, with ~16. being pretty common. So as a result of all that history, a lot of DC candidates are still at the TF level that was determined optimal and applied many years ago, which became suboptimal. These are being revisited and taken further in TF. See for example this detailed exponent report, on one I have reserved for DC: https://www.mersenne.org/report_expo...exp_hi=&full=1 Quote:
Be patient with yourself. There's a big learning curve. One step at a time. Contribute how you can and in the ways you enjoy. Your choice of a GTX1650 is a good one. It's about as good a TF throughput per watt as can be found at reasonable price. 

20200307, 18:13  #13  
Feb 2020
23 Posts 
First of all, again, thanks for the indepth replies!
(sorry, I've rearranged your post a bit for ease of replying) Quote:
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Eventually I'd like to get some math chops so I can also understand the discussions on number theory and software development, but I'm in no hurry. 

20200307, 18:59  #14  
If I May
"Chris Halsall"
Sep 2002
Barbados
2^{2}·3^{2}·5·7^{2} Posts 
Quote:
Rather than LL, we should instead use something like "First Test" ("FT"), which might be an LL or (better) a PRP. DC is a similar meta term. 

20200307, 19:05  #15  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
2^{3}·7·61 Posts 
Quote:
FC or 1C, DC, TC, 4C & 5C if we're really unlucky. 

20200307, 19:14  #16 
If I May
"Chris Halsall"
Sep 2002
Barbados
10001001110100_{2} Posts 

20200308, 12:27  #17 
Feb 2020
23 Posts 
Something interesting seemed to happen. I enabled in my BIOS "eco mode" for my 3700X in order to run my fan slowly and keep low temps with the stock cooler (doesn't even reach 70C now).
I clearly remember ms/iter on the current exponent to be about 2.1 to 2.2 before enabling eco mode, on stock settings. But now, with a way lower clock of ~3300MHz vs ~4200MHz on all cores  ms/iter is consistently below 2, going all the way down to 1.9. I really don't get it. It wasn't thermal throttling before, and is now limited to 60W total (35W reported for "CPU power"). Is there a reasonable explanation for this? If it doesn't make sense to you folks either, I might try digging deeper and doing benchmarks in both default and eco modes, though that's a bit of a hassle... PS: is it ok if I occasionally use this thread to ask these kind of "dumb questions"? Should be tidier and not clutter the forum. Last fiddled with by EugenioBruno on 20200308 at 12:27 
20200311, 11:06  #18  
Romulan Interpreter
Jun 2011
Thailand
3×2,791 Posts 
Quote:
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Last fiddled with by LaurV on 20200311 at 11:09 

20200311, 12:38  #19 
Feb 2020
23_{10} Posts 
Extremely clear answer, thanks.

20200325, 08:10  #20 
Feb 2020
17_{16} Posts 
Dang, I was looking forward to Cat 0, but looks like this disqualifies me, right? Or maybe if the triple check comes back agreeing with mine, I'm not disqualified?
https://www.mersenne.org/report_expo...0434247&full=1 
20200325, 13:41  #21  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
7,753 Posts 
Quote:


20200328, 21:12  #22 
Feb 2020
23 Posts 

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