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Author Topic: unexplainable slower hash rate  (Read 95 times)
alhashwhy
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February 10, 2018, 02:53:06 AM
 #1

This has been bugging my mind a lot, am not usually one to seek for help but i ran out of ideas.
Currently am mining zcash with a 1080 gtx using  EWBF's Zcash CUDA miner. 0.3.4b.
Problem is when the computer is in my bedroom it mines 600-620 sol/s, but when i go to sleep i move the computer to another room and the speed drops to 520-540 sol/s for no apparent reason,
the OC is the same,
 internet cable are the same cat6e connected to the same switch,
same energy cable,
gpu-z clocks are stable
reinstalled drivers (390.77)
settings are max performance on nvidia same on power plan on windows 10
I even tried using onboard gpu to display to monitor, same effect

Temps while i am in my room never surpass 62ºC, while on the another room they don't even surpass 55ºC


Any suggestion?
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OgNasty
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February 10, 2018, 07:34:32 AM
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Could it be attributed to luck, perhaps you are measuring it by the pool stats and not getting quite an accurate reading?

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February 10, 2018, 06:29:24 PM
 #3

This has been bugging my mind a lot, am not usually one to seek for help but i ran out of ideas.
Currently am mining zcash with a 1080 gtx using  EWBF's Zcash CUDA miner. 0.3.4b.
Problem is when the computer is in my bedroom it mines 600-620 sol/s, but when i go to sleep i move the computer to another room and the speed drops to 520-540 sol/s for no apparent reason,
the OC is the same,
 internet cable are the same cat6e connected to the same switch,
same energy cable,
gpu-z clocks are stable
reinstalled drivers (390.77)
settings are max performance on nvidia same on power plan on windows 10
I even tried using onboard gpu to display to monitor, same effect

Temps while i am in my room never surpass 62ºC, while on the another room they don't even surpass 55ºC


Any suggestion?


You're in the wrong forum, but like the other gentleman asked are you going by pool stats or ?? If you're going by pool stats then the time you're down moving between rooms and getting set up might be affecting the calculation.

alhashwhy
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February 11, 2018, 12:35:58 AM
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By what the miner says, the pools graphs also indicate the same decline, only difference i have in my room is that i plug in two monitors, but that should not make a difference and if it did it would degrade the performance, not improve it

Thank you for moving the topic
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February 11, 2018, 12:40:01 AM
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By what the miner says, the pools graphs also indicate the same decline, only difference i have in my room is that i plug in two monitors, but that should not make a difference and if it did it would degrade the performance, not improve it

Thank you for moving the topic

Only way to tell is to plug that 2nd monitor in when it's in the other room Smiley

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February 11, 2018, 02:13:31 AM
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did you check the risers? it can be a riser problem, unplug the riser slot under the gpu, (i mean pcie 16x slot). and check it with visual inspection. maybe it can be dusty, a small dust can do this. you can blow it with your mounth. mounty blowing is enough pressure for fix that.

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February 11, 2018, 05:39:24 AM
 #7

This has been bugging my mind a lot, am not usually one to seek for help but i ran out of ideas.
Currently am mining zcash with a 1080 gtx using  EWBF's Zcash CUDA miner. 0.3.4b.
Problem is when the computer is in my bedroom it mines 600-620 sol/s, but when i go to sleep i move the computer to another room and the speed drops to 520-540 sol/s for no apparent reason,
the OC is the same,
 internet cable are the same cat6e connected to the same switch,
same energy cable,
gpu-z clocks are stable
reinstalled drivers (390.77)
settings are max performance on nvidia same on power plan on windows 10
I even tried using onboard gpu to display to monitor, same effect

Temps while i am in my room never surpass 62ºC, while on the another room they don't even surpass 55ºC


Any suggestion?


what PSU are you using? try running the card under different rails even with a good PSU. compared the core clock for your GPU running in both rooms. You might not be thermal throttled but sound like the GPU driver is deciding your PSU can't supply stable power when in use outside your bedroom and lowered the core clock and caused hashrate drop.

I had similar experience with identical GPUs in a rig but one just decided to run 200 MHz lower on it's cclock (obviously, same OC settings) until I ditched the PSU's PCIe rail for an alternative rail via molex to PCIe connectors, basically just spread the load, even with a decent PSU that has enough power (wattage) rating.
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February 11, 2018, 07:09:21 AM
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Are the two rooms on the same circuit?  If not, is the ampere rating different?
alhashwhy
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February 11, 2018, 07:30:00 AM
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what PSU are you using? try running the card under different rails even with a good PSU. compared the core clock for your GPU running in both rooms. You might not be thermal throttled but sound like the GPU driver is deciding your PSU can't supply stable power when in use outside your bedroom and lowered the core clock and caused hashrate drop.

I had similar experience with identical GPUs in a rig but one just decided to run 200 MHz lower on it's cclock (obviously, same OC settings) until I ditched the PSU's PCIe rail for an alternative rail via molex to PCIe connectors, basically just spread the load, even with a decent PSU that has enough power (wattage) rating.


Good idea, mine is a TX 750W its quite dated but should handle sli, i will try to switch up psu


Are the two rooms on the same circuit?  If not, is the ampere rating different?

Yes, they are on the same circuit
Souran
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February 11, 2018, 08:54:02 AM
 #10

are you sure the OC is the same?

From what I know about nvidia's 10series, they will downclock/throttle themselves when the temps reach a certain degree regardless of your overclock profile

this could be the case, maybe the other room isnt as cold as the first?
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