Title: Claymore multi GPU mining performance differences Post by: kanick on November 18, 2016, 10:50:28 PM [Apologies if this has been addressed. If it has, I could not find it.]
*Two RX480 GPUs, detected and working on Win7. *16GB RAM; SSD; ASUS P8Z77M mobo. *Intel HD Graphics 4000 driver onboard video driver is active. *Both use their own 750W PSU. *Latest AMD driver (16.11.4) on both. Using Claymore Dual ETH v7.2. Claymore sees both Ellsmere GPUs fine. Mining function works as expected. But one GPU mines at ˜22MH/s, the other at ˜4MH/s. Same thing happens with ZEC mining (using Claymore v7.0 beta): GPU0 = ˜165 H/s; GPU1 = ˜37 H/s. I have tried changing the slots but the results are the same. When the GPUs are run in separate hosts using same Claymore miner, they perform equally well. How might I get GPU1 to perform as well as GPU0? Keywords: Claymore, Radeon, ETH, ZEC Title: Re: Claymore multi GPU mining performance differences Post by: adaseb on November 18, 2016, 10:51:39 PM Plug the 4MH/s GPU into a monitor or get a dummy plug or put in an old GPU inside that rig along with the current cards.
Title: Re: Claymore multi GPU mining performance differences Post by: kanick on November 18, 2016, 11:54:16 PM do you have a link for the dummy plug?
im not sure i want to try to rig one and the only pre-made dummy one im finding has 3 pins surrounding the flat bat that will prevent it from fitting the DVI port on my cards. http://www.ebay.com/itm/DVI-Graphics-Card-Display-GPU-Detection-Monitor-Dummy-Plug-Adapter-VE-D11-/271524944893 do i need one of these for all GPUs attached via riser and not connected to a monitor? many thanks. Title: Re: Claymore multi GPU mining performance differences Post by: xxcsu on November 21, 2016, 02:43:07 PM do you have a link for the dummy plug? many thanks. there is one from amazon : https://www.amazon.com/gp/product/B00FLZXGJ6/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1 (https://www.amazon.com/gp/product/B00FLZXGJ6/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1) and one from ebay : http://www.ebay.com/itm/191567271934?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT (http://www.ebay.com/itm/191567271934?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) you dont need a dummy plug if you have a monitor attached to any of your rx 480 , and the monitor is turned on all the time. you need a dummy plug if you are running a headless system , (no monitor attached to your computer , or if the monitor is not on during mining) and remotely controlling your setup , via remote desktop teamviewer ... [Apologies if this has been addressed. If it has, I could not find it.] *Two RX480 GPUs, detected and working on Win7. *16GB RAM; SSD; ASUS P8Z77M mobo. *Intel HD Graphics 4000 driver onboard video driver is active. *Both use their own 750W PSU. *Latest AMD driver (16.11.4) on both. Using Claymore Dual ETH v7.2. Claymore sees both Ellsmere GPUs fine. Mining function works as expected. But one GPU mines at ˜22MH/s, the other at ˜4MH/s. "Both use their own 750W PSU" Why are You using 2 x 750 watts psu for 2 x rx 480 setup ??? you should run your setup from 1 750 watts psu with 2 rx 480 card without any problem ! "one GPU mines at ˜22MH/s, the other at ˜4MH/s" 22MH/s is to low for the stock rx 480 , there is probably some driver or i/o conflict in your system that is why you get 4MH/s on the second card . Or you are using a wrong modded, flashed bios for your RX 480's [Apologies if this has been addressed. If it has, I could not find it.] How might I get GPU1 to perform as well as GPU0? 1st : - use 1 psu !!! - plug one of your RX 480 on the first pcie 16X slot , connect your monitor for the same card , (the longest blue one close to the cpu) via powered usb riser , leave the second one unplugged - go to your bios settings and disable on board graphic "Intel HD Graphics 4000 driver onboard video driver is active." - boot into windows 7 - dowload DDU (Display Driver Uninstaller )from here : http://www.wagnardmobile.com/?q=display-driver-uninstaller-ddu- (http://www.wagnardmobile.com/?q=display-driver-uninstaller-ddu-) - run DDU , option restart the pc in safe mode to remove the drivers .. remove all amd and intel drivers , reboot . - after reboot install the latest AMD driver , still only one of your rx 480 plugged in via powered riser http://support.amd.com/en-us/download (http://support.amd.com/en-us/download) - reboot .. wait till windows recognize and assign the driver to your card. - turn of your pc , connect the second rx 480 via powered usb riser to your computer , use the second slot on your motherboard ( pciexpress , blue 2nd from the cpu) - turn on your pc , and wait wait wait , windows sometimes need 5-10 minutes to assign the driver for your second card during this time your monitor screen maybe go dark going to flickering , dont Be panic , just wait .... just in case leave your pc running after reboot for a 5-10 minutes windows maybe working in the backround assigning the driver . - reboot , set virtual memory at least 16GB on your system http://www.online-tech-tips.com/computer-tips/simple-ways-to-increase-your-computers-performace-configuring-the-paging-file/ (http://www.online-tech-tips.com/computer-tips/simple-ways-to-increase-your-computers-performace-configuring-the-paging-file/) - reboot , use latest claymore miners for ETH or Zcash - make sure you place this into your start batch file : GPU_FORCE_64BIT_PTR 0 GPU_MAX_HEAP_SIZE 100 GPU_USE_SYNC_OBJECTS 1 GPU_MAX_ALLOC_PERCENT 100 GPU_SINGLE_ALLOC_PERCENT 100 2nd: If the first steps did not worked for you , i would suggest a fresh win 7 install , and follow the steps above except the Display Driver Uninstaller parts :) |