# (SOLVED) 2 identical CPUs i7 6700 gives different results **URL:** \ **Category:** Mining\ **Created:** [November 7, 2016, 12:25am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568 "2016-11-07T00:25:20Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 12:25am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/1 "2016-11-07T00:25:20Z")
Hi, I’ve got 2 of i7 6700 CPU (Intel(R) Core™ i7-6700 CPU @ 3.40GHz) machines and 1 is working just fine at ≈ 30 sol/s (which is normal for the CPU), while second one gives around 15 sol/s. Using nicehash/nheqminer. Configurations are 100% similar, both are bare metal with 32gb RAM, CPU usage is 800 %, RAM usage is 2GB on each of them. everything is the same, but speed is different. Any ideas on where to dig? ---
**Author:** ![Voluntary](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/voluntary/32/4343_2.png) [@Voluntary](https://forum.zcashcommunity.com/u/Voluntary)\ **Post date:** [November 7, 2016, 12:38am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/2 "2016-11-07T00:38:20Z")
Are they using the same kind of memory? Are their memory channels configured the same way? ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 12:50am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/3 "2016-11-07T00:50:55Z")
Memory setup is slightly different. Here is “lshw -class memory” output for #1: [mem1 · GitHub](https://gist.github.com/anonymous/1a0d725124abe7fca0739d7929bbbb4a) and here is for #2: [mem2 · GitHub](https://gist.github.com/anonymous/6e07f486434725f05b5fff101932d8dc) Could you please confirm if there’s something that could affect the sol/s rate? ---
**Author:** ![trolloniex](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/trolloniex/32/2833_2.png) [@trolloniex](https://forum.zcashcommunity.com/u/trolloniex)\ **Post date:** [November 7, 2016, 12:52am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/4 "2016-11-07T00:52:54Z")
try using -t 6 (75% of threads) ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 12:58am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/5 "2016-11-07T00:58:13Z")
speed have increased to 17 sol/s, 6 threads are used (600% CPU, 1.2GB RAM). What can be meaning of this? Also I’ve just tried -t 4 and it gives me 15 sol/s with 400% CPU usage. I’ll now try to run 2 apps and set CPU cores to use for each of them manually ---
**Author:** ![Voluntary](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/voluntary/32/4343_2.png) [@Voluntary](https://forum.zcashcommunity.com/u/Voluntary)\ **Post date:** [November 7, 2016, 1:04am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/6 "2016-11-07T01:04:50Z")
It looks like one of your systems can access its memory via two channels while the other is only using a single channel. Extra memory channels provide more bandwidth but, so far as I know, making the most efficient use of them at the OS and application level can be difficult to achieve. With your 2x16GB system, try putting the 2nd memory stick in a different slot so that the slots are used something like this: occupied, empty, occupied, empty. ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 1:13am UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/7 "2016-11-07T01:13:29Z")
@trolloniex unfortunately setting CPUs per miner instance didn’t work - each miner’s speed is 8-9 now which is almost the same as 1 miner with -t 6. @Voluntary thanks for the suggestion - I will try to check it, but any other suggestions would be highly appreciated since it’s dedicated server and provider is not too good in terms of support, average response time is 24h and I can’t go with trial&error easily in this situation easily. ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 12:32pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/8 "2016-11-07T12:32:51Z")
@Voluntary thank you, fortunately that did the trick - single RAM channel was the issue, after placing 2nd module to work on a separate channel I’ve got my 30 sol/s 🙂 Thank you all, guys, for your suggestions and help! ---
**Author:** ![zawy](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/zawy/32/11892_2.png) [@zawy](https://forum.zcashcommunity.com/u/zawy)\ **Post date:** [November 7, 2016, 1:41pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/9 "2016-11-07T13:41:25Z")
@voluntary I’m really impressed you thought of that as the possible problem. I’m so dumbfounded that you thought of that as the possible problem, the only way it fits into my world view is that you also made the same (incredibly dumb) mistake…RECENTLY. LOL ---
**Author:** ![zawy](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/zawy/32/11892_2.png) [@zawy](https://forum.zcashcommunity.com/u/zawy)\ **Post date:** [November 7, 2016, 2:01pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/10 "2016-11-07T14:01:26Z")
If the i7-6700 is not efficient in getting ZEC. See if they have other cheaper older options like i7-2600 (21 S/s withDDR3 1333), or i7-3770 (23 S/s with DDR3-1600). Bascially any i7 or i5 that is not so new. 2x4 GB RAM is plenty. ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 2:04pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/11 "2016-11-07T14:04:13Z")
Thanks, but I’m completely ok with 6700 for now since I know where to get it cheap 🙂 ---
**Author:** ![Voluntary](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/voluntary/32/4343_2.png) [@Voluntary](https://forum.zcashcommunity.com/u/Voluntary)\ **Post date:** [November 7, 2016, 8:01pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/12 "2016-11-07T20:01:27Z")
It’ll take some forum archaeology but if anyone goes back through my posts they’ll see I’ve been banging on about memory channels and their potential to impact Zcash mining for quite a while. ---
**Author:** ![786sam](https://avatars.discourse-cdn.com/v4/letter/7/dc4da7/32.png) [@786sam](https://forum.zcashcommunity.com/u/786sam)\ **Post date:** [November 7, 2016, 8:55pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/13 "2016-11-07T20:55:46Z")
Is that a 6700 or 6700k? Iv got a 6700 and get only 15 sol/s … 28 h/s on suprnova pool… where am i going wrong? ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 9:01pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/14 "2016-11-07T21:01:59Z")
it’s 6700 (6700 = 3.4GHz, 6700k = 4.0GHz). Since h/s == sol/s, it’s not clear what you getting… ---
**Author:** ![786sam](https://avatars.discourse-cdn.com/v4/letter/7/dc4da7/32.png) [@786sam](https://forum.zcashcommunity.com/u/786sam)\ **Post date:** [November 7, 2016, 9:08pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/15 "2016-11-07T21:08:24Z")
I get 15 sols/s when connecting to suprnova pool? Have you tried suprnova yet? ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 9:11pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/16 "2016-11-07T21:11:46Z")
no, I’m fine with flypool. But probably you are either running into the same issue I did (single RAM channel instead of 2), or suprnova reduces hashrate on it’s own. I guess first is more likely. ---
**Author:** ![786sam](https://avatars.discourse-cdn.com/v4/letter/7/dc4da7/32.png) [@786sam](https://forum.zcashcommunity.com/u/786sam)\ **Post date:** [November 7, 2016, 9:14pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/17 "2016-11-07T21:14:20Z")
![](https://global.discourse-cdn.com/zcash/original/2X/3/3a31bc90937ebbca9b3342a7f2e4013158ad4db6.jpg) Actually its 28 sols i get my bad ---
**Author:** ![R0m4n](https://avatars.discourse-cdn.com/v4/letter/r/0ea827/32.png) [@R0m4n](https://forum.zcashcommunity.com/u/R0m4n)\ **Post date:** [November 7, 2016, 9:15pm UTC](https://forum.zcashcommunity.com/t/solved-2-identical-cpus-i7-6700-gives-different-results/7568/18 "2016-11-07T21:15:12Z")
yes, looks just fine