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Author Topic: What is Intensity & Best Intensity Settings? (5830, 5850, 6870 and 7970) CGMine  (Read 30338 times)
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August 25, 2012, 02:46:28 AM
 #21

Intensity is the amount of work in one go the GPU has to do before it can return its results. It needs to be large enough to keep the device fully utilised yet not so overloaded that the device becomes unresponsive. The faster the GPU, the higher the sweet spot is. Ram is of no use to mining whatsoever. They could even mine fine with only a few MB of ram.

pretty sure most people will run into a roadblock with their CPU before their GPU.  you could keep increasing it and get some infinitesimally higher results except your cpu will hit 100% usage

i have 4 5870's on a single core sempron that i run at agg 7 in phoenix, because at agg 8 the cpu is 100%

Dacentec, best deals for US dedicated servers. They regularly restock $20-$25 Opterons with 8-16GB RAM & 2x1-2TB HDD's (ofc, usually lots of other good stuff to choose from).  I did a Serverbear benchmark of one of my $20/mo Opteron (June last year), it's here.  Have had about a half dozen different servers with Dacentec, & none have failed to sustain at least 40MB/s (burst higher). My favorite is a 12-month rent-to-own ZT Systems 2XL5520 16GB 2x2TB SATA for $40/month (got lucky with the 'off-brand', haven't seen a RTO 2xL5520 for under $50/mo since -- at least for monthly contracts).  wholesaleinternet.com has some ancient 2-core intel CPUs @ $10/mo sometimes (I got an Intel Core 2 6300 @ 1.86GHz, with a 250GB HDD with 46000 hours on it, LOL. $20 @ Dacentec is much better, if you can grab one). joesdatacenter.com (same location as Wholesale Internet) also occasionally has specials (or if you don't want to wait, it has an AMD Opteron 170 @ $16/mo).
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August 25, 2012, 03:32:26 AM
 #22

Intensity is the amount of work in one go the GPU has to do before it can return its results. It needs to be large enough to keep the device fully utilised yet not so overloaded that the device becomes unresponsive. The faster the GPU, the higher the sweet spot is. Ram is of no use to mining whatsoever. They could even mine fine with only a few MB of ram.

pretty sure most people will run into a roadblock with their CPU before their GPU.  you could keep increasing it and get some infinitesimally higher results except your cpu will hit 100% usage

i have 4 5870's on a single core sempron that i run at agg 7 in phoenix, because at agg 8 the cpu is 100%
That is a driver problem. The CPU usage required to set higher intensities intrinsically in cgminer is actually less than at lower intensities.

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March 31, 2013, 06:09:30 PM
 #23

I've been playing around with intensity setting in cgminer and noted on a 7870 when I went to I=13 I was suddenly getting mostly rejections.

So besides affecting hash rate, can a suboptimal intensity also lead to high rejection rates?
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