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Title: Vega 64 low hashrate Post by: jimmy_007vn on February 03, 2018, 05:49:20 PM Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue? I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me :'( Update: No matter how i set my cards, there is always one card that dropped down to 1200H/s. Sometime that card reach 1500H/s then other 3 other drops total of 300H/s. So, total hashrate of all 4 cards in any case always around 7200H Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 12:31:32 AM Up. i will reward 0.002btc for whoever help me fix this issue.
Title: Re: Vega 64 low hashrate Post by: krylz on February 04, 2018, 01:12:05 AM What motherboard are you using?
Title: Re: Vega 64 low hashrate Post by: Juggar on February 04, 2018, 01:32:52 AM Wasn't it the FE Vegas that had a hard ceiling of like 9000 H/s or something? Do you have any of those?
Title: Re: Vega 64 low hashrate Post by: Undefined31415 on February 04, 2018, 01:37:09 AM Hi all, I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue? I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me :'( What mining software are you using? Title: Re: Vega 64 low hashrate Post by: CryptoPlay on February 04, 2018, 03:08:44 AM Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY. So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that. If you was getting 2k, its not windows or bios. It is temp. You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry. http://vega.miningguides.com/p/tuning.html good luck Title: Re: Vega 64 low hashrate Post by: P00P135 on February 04, 2018, 03:56:34 AM Hi all, I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue? I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me :'( Make sure crossfire is disabled, might have to modify your registry. Title: Re: Vega 64 low hashrate Post by: Digital Drug Lord on February 04, 2018, 04:23:14 AM Hi all, I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue? I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me :'( powersupply my BTC address 3Bt8AxDFP7DZoqwsivpSA8L8be1SnV4pFy Title: Re: Vega 64 low hashrate Post by: Toughit on February 04, 2018, 04:28:15 AM Try one more stick of 4gb ram as a test, make sure you have 60gb virtual memory. Try the ram first, dont do both at once
Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 04:46:32 AM Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 04:47:19 AM Hi all, I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue? I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me :'( What mining software are you using? Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 04:48:12 AM Set min fan speed to 3000. HBM are all below 75. It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY. So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that. If you was getting 2k, its not windows or bios. It is temp. You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry. http://vega.miningguides.com/p/tuning.html good luck Title: Re: Vega 64 low hashrate Post by: bubbagump on February 04, 2018, 05:53:15 AM Does your BIOS have a setting for "4g decoding" or a setting for changing the PCIE version to use?
Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 06:13:01 PM Does your BIOS have a setting for "4g decoding" or a setting for changing the PCIE version to use? I have 4G option on, and tried both gen 1 or 2 for pcie. Also i added 4G ram to my rig this morning make it to 8G ram, 200G virtual ram. still sign of improvement. Title: Re: Vega 64 low hashrate Post by: treanski on February 04, 2018, 06:27:54 PM Set min fan speed to 3000. HBM are all below 75. It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY. So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that. If you was getting 2k, its not windows or bios. It is temp. You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry. http://vega.miningguides.com/p/tuning.html good luck hbm temp needs to be below 70°C, make sure you disable/enable all vegas in device manager before mining. use registry powerplay tables. flash your 56 vegas with 64 bios for better hashrate read this guide, every word! http://vega.miningguides.com/ Title: Re: Vega 64 low hashrate Post by: Toughit on February 04, 2018, 06:47:32 PM Set min fan speed to 3000. HBM are all below 75. It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY. So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that. If you was getting 2k, its not windows or bios. It is temp. You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry. http://vega.miningguides.com/p/tuning.html good luck I run my vegas at a temp target of 62 with 3000 rpm fan I think you said it is just the one card. Can you run it alone again and set the temp target really low and the fan really high? Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 04, 2018, 07:03:20 PM Set min fan speed to 3000. HBM are all below 75. It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY. So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that. If you was getting 2k, its not windows or bios. It is temp. You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry. http://vega.miningguides.com/p/tuning.html good luck I run my vegas at a temp target of 62 with 3000 prm fan I think you said it is just the one card. Can you run it alone again and set the temp target really low and the fan really high? yea, its just one card. Before it was the Red Devil 64. Since i switched it to other pcie slot, now the vega 56 has a low hashrate. Title: Re: Vega 64 low hashrate Post by: bubbagump on February 05, 2018, 11:05:10 AM Is it always the same slot that has the underperforming card? Is it the same riser each time? Also, did you try a different power supply?
Title: Re: Vega 64 low hashrate Post by: jimmy_007vn on February 06, 2018, 04:27:30 AM Is it always the same slot that has the underperforming card? Is it the same riser each time? Also, did you try a different power supply? It's not always the same card. Every time i switch pcie slot, the underperforming card also switch. One thing i noted today, one of my cards always 15oC hotter then the rest of the rig. But today, i unplugged that card, the other 3 become weird. One card was mining at lower hashrate. one card became hotter. The last one was normal. |