done a try to OC a bit now. from 1080 core til 1150 core volt +25 and power limit +50
did go from 28.4 to 30.3Mhs
temps are around 70-72c with fans on auto around 45%
that didnt go so well for me  computer hung after 20min will give a bit lower oc and see if that works Try 1100, -100mV to core & aux + tap user defined fan profile. Leave power limit as it is. -100mV to core & aux set. but i see some black lines on the screen when i have 1100 like the graphics tear. get lower temps 64c now at 1080 didnt see much diffrence when i had it at 1100 -100 gave me black screen after a few mins. What brand is that card? And what PSU? |
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Oh yeah, that would be quite lucrative for any dev selling it.
And the price would be far from 0.1 BTC... Of course. But that would actually worth it. True. My bet is there aren't so many nvidia farms out there mining ETH. |
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done a try to OC a bit now. from 1080 core til 1150 core volt +25 and power limit +50
did go from 28.4 to 30.3Mhs
temps are around 70-72c with fans on auto around 45%
that didnt go so well for me computer hung after 20min will give a bit lower oc and see if that works Try 1100, -100mV to core & aux + tap user defined fan profile. Leave power limit as it is. |
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That's what I thought too after playing with nvidias. In fact I was running these amd's long time at 1600-1700 mem thinking it automatically gives me more hash.
Nvidia with 256-bit memory lane and 3,5-4GB is memory limited, amd with 384-bit and 3GB suffers from DAG-file size, amd with 512-bit and 8GB is begging for core overclock.
maxwell cores are typically overclocked/boosted from the factory so there may not be as much room left anyway compared to AMD's, but power to get there is still the differentiator. I don't see 390's with less than 8GB, or less than $300+ each... but at $12+/ETH, ROI is so short for anything these days.  Cheap 290 with 512-bit bus and 4GB does closer to 30MH. It just doesn't show me that memory controller load... |
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Oh yeah, that would be quite lucrative for any dev selling it.
And the price would be far from 0.1 BTC... |
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Gamers report a lot of coil whine issues with that cheap XFX Nano. How is it with your Nano army?
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Can you speculate why the 390x is not faster than the 390 at the same frequency. It has more core, 2816 vs. 2560.
I have no idea. 10% difference should be easy to see, anyone with both 390 and 390x? Memory speed may have as much or more to do with it, as well as bandwidth, since the DAG is hashed purely in gpu memory. Don't know about AMD, but GTX responds much better to maxing memclock vs any bump in core clock. That's what I thought too after playing with nvidias. In fact I was running these amd's long time at 1600-1700 mem thinking it automatically gives me more hash. Nvidia with 256-bit memory lane and 3,5-4GB is memory limited, amd with 384-bit and 3GB suffers from DAG-file size, amd with 512-bit and 8GB is begging for core overclock. |
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Can you speculate why the 390x is not faster than the 390 at the same frequency. It has more core, 2816 vs. 2560.
I have no idea. 10% difference should be easy to see, anyone with both 390 and 390x? |
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i'm wasting 166w per card , 970 for mining ethereum with 22mega
someone has a better performance?
Sure Nano's.. well it cost 60% more, so it's not that better, you pay upfront the electricity for 1 year I have seen some retailers selling XFX Nano for 399€ |
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What was the aux voltage before the cleaning? Do you believe it is due to the memory frequency going down from 1500 to 1200? Did you see the difference in power in/out?
aux -100mV adds another 15W of powersaving, from 540 to 525W. Memory downclock savings are minimal, hard to see at the wall. No difference in power in/out. 1125/1200 is the ratio where memory controller load is 96-97%. I thought the IC power consumption is linearly proportional to the circuit frequency. Why the drop from 1500 to 1200 MHz has not effect? I thought so too but it looks like we were wrong. It does have an effect as long as core can utilize memory controller 100%. Lower mem - lower hash and power consumption, higher mem - nothing happens, mc just sits and waits for work. I went so far that I tested 720/750, again same ratio, mc load close to 100%. I didn't have time to verify this but it looks like 390 could be the first no Nano 20MH/100W card. 310W from the wall and ethminer hashrate somewhere at 40MH area. From your observation, the hash rate is limited by the Core frequency. The more core, the better. So the 390x should have higher hash rate, but it is at best same as 390. Quite strange. It is. Based on my tests to get mc 100% loaded at 1500MHz you would need 1400 core which is obviously impossible. |
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Etherum just passed 1 billion dollars in market cap. Who wan't to be the first altcoin billionaire?
2 Ethereum Ethereum $ 1,033,758,698 $ 13.30 77,701,680 ETH $ 44,587,500 17.83 %
Jump on the train. A ticket to the moon.
One etherum coin can be worth 1000$ in a few years just like bitcoin.
Volume already passed BTC |
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What was the aux voltage before the cleaning? Do you believe it is due to the memory frequency going down from 1500 to 1200? Did you see the difference in power in/out?
aux -100mV adds another 15W of powersaving, from 540 to 525W. Memory downclock savings are minimal, hard to see at the wall. No difference in power in/out. 1125/1200 is the ratio where memory controller load is 96-97%. I thought the IC power consumption is linearly proportional to the circuit frequency. Why the drop from 1500 to 1200 MHz has not effect? I thought so too but it looks like we were wrong. It does have an effect as long as core can utilize memory controller 100%. Lower mem - lower hash and power consumption, higher mem - nothing happens, mc just sits and waits for work. I went so far that I tested 720/750, again same ratio, mc load close to 100%. I didn't have time to verify this but it looks like 390 could be the first no Nano 20MH/100W card. 310W from the wall and ethminer hashrate somewhere at 40MH area. |
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Do you use Windows MSI Afterburner to undervolate the 390? What is the undervolate level? What is the maximum you can do? Is that over -100 mV?
Yes, afterburner. Maximum is -100mV on both cards. How much is your power consumption for the XFX 390 cards? What is your clock frequency and the power consumption read from the GPUZ? I did a test, took one old s775 mobo with E8400 + 2 x 2GB DDR2, slammed in two 390's (8GB each), laptop hdd. PSU is not rated corsair CX750M, voltage 228V. Windows 7 x64. Asus has hynix memory and xfx elpida. Clocks 1125/1500, limiting factor is core. Memory controller load is max 80%. From the wall: idle ~100W mining 680W mining -100mV 580W Hashrate 30MH+ 30MH- around 30MH/card. Block . The Power in is 136W, 2x = 272W, 580-272 = 310W, the idle = 100w, so there is 210W difference. Are they from the fans or you have a very inefficient power supply? I don't trust software when calculating power consumption, they always show too low numbers, both nvidia&amd. Took another card out and power consumption went down 280W. At those loads cx750m efficiency is ~86%. -edit- Did some cleaning. Idle 90W, mining 1125/1200, core & aux -100mV, 525W from the wall. What was the aux voltage before the cleaning? Do you believe it is due to the memory frequency going down from 1500 to 1200? Did you see the difference in power in/out? aux -100mV adds another 15W of powersaving, from 540 to 525W. Memory downclock savings are minimal, hard to see at the wall. No difference in power in/out. 1125/1200 is the ratio where memory controller load is 96-97%. |
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sp_ have you tested your dcr mod on 980?
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Do you use Windows MSI Afterburner to undervolate the 390? What is the undervolate level? What is the maximum you can do? Is that over -100 mV?
Yes, afterburner. Maximum is -100mV on both cards. How much is your power consumption for the XFX 390 cards? What is your clock frequency and the power consumption read from the GPUZ? I did a test, took one old s775 mobo with E8400 + 2 x 2GB DDR2, slammed in two 390's (8GB each), laptop hdd. PSU is not rated corsair CX750M, voltage 228V. Windows 7 x64. Asus has hynix memory and xfx elpida. Clocks 1125/1500, limiting factor is core. Memory controller load is max 80%. From the wall: idle ~100W mining 680W mining -100mV 580W Hashrate 30MH+ 30MH- around 30MH/card. Block . The Power in is 136W, 2x = 272W, 580-272 = 310W, the idle = 100w, so there is 210W difference. Are they from the fans or you have a very inefficient power supply? I don't trust software when calculating power consumption, they always show too low numbers, both nvidia&amd. Took another card out and power consumption went down 280W. At those loads cx750m efficiency is ~86%. -edit- Did some cleaning. Idle 90W, mining 1125/1200, core & aux -100mV, 525W from the wall. |
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You said the limiting factor is the Core frequency. Does it mean if we use the 390x, we can achieve better hash with the same or lower core frequency?
Higher core means more hash. You can underclock mem to some point without loosing performance, 390x might be different but I don't have one to test. |
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Do you use Windows MSI Afterburner to undervolate the 390? What is the undervolate level? What is the maximum you can do? Is that over -100 mV?
Yes, afterburner. Maximum is -100mV on both cards. How much is your power consumption for the XFX 390 cards? What is your clock frequency and the power consumption read from the GPUZ? I did a test, took one old s775 mobo with E8400 + 2 x 2GB DDR2, slammed in two 390's (8GB each), laptop hdd. PSU is not rated corsair CX750M, voltage 228V. Windows 7 x64. Asus has hynix memory and xfx elpida. Clocks 1125/1500, limiting factor is core. Memory controller load is max 80%. From the wall: idle ~100W mining 680W mining -100mV 580W Hashrate 30MH+ 30MH- around 30MH/card. Block . What is the temperature? When you use -100mV, does it work at 1125 MHz? Do you notice the change if you change the memory frequency from 1500 to 1250 or 1000MHz? Temperatures 65 and 63C, they are mining -100mV/1125 as we speak. Lowering mem speed rises memory controller load, at 1200MHz load is 100%. Lower more and hash starts declining. Overclocking mem to 1600MHz does nothing but drops MCL closer to 70%. Hashrate has stabilized to 61MH. When you lower the memory speed from 1500 to 1200MHz, does it affect the power consumption? Where do you see the memory controller load? No it doesn't, well maybe 0-5W. GPUZ shows it on sensors but only with 390. On 7970 or 290 it isn't listed. |
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Do you use Windows MSI Afterburner to undervolate the 390? What is the undervolate level? What is the maximum you can do? Is that over -100 mV?
Yes, afterburner. Maximum is -100mV on both cards. How much is your power consumption for the XFX 390 cards? What is your clock frequency and the power consumption read from the GPUZ? I did a test, took one old s775 mobo with E8400 + 2 x 2GB DDR2, slammed in two 390's (8GB each), laptop hdd. PSU is not rated corsair CX750M, voltage 228V. Windows 7 x64. Asus has hynix memory and xfx elpida. Clocks 1125/1500, limiting factor is core. Memory controller load is max 80%. From the wall: idle ~100W mining 680W mining -100mV 580W Hashrate 30MH+ 30MH- around 30MH/card. Block . How do you find the memory controller load? In which software? In GPUZ, what is the power in and power out? GPUZ shows it with 390's. Average in/out 136/107W. |
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Do you use Windows MSI Afterburner to undervolate the 390? What is the undervolate level? What is the maximum you can do? Is that over -100 mV?
Yes, afterburner. Maximum is -100mV on both cards. How much is your power consumption for the XFX 390 cards? What is your clock frequency and the power consumption read from the GPUZ? I did a test, took one old s775 mobo with E8400 + 2 x 2GB DDR2, slammed in two 390's (8GB each), laptop hdd. PSU is not rated corsair CX750M, voltage 228V. Windows 7 x64. Asus has hynix memory and xfx elpida. Clocks 1125/1500, limiting factor is core. Memory controller load is max 80%. From the wall: idle ~100W mining 680W mining -100mV 580W Hashrate 30MH+ 30MH- around 30MH/card. Block . What is the temperature? When you use -100mV, does it work at 1125 MHz? Do you notice the change if you change the memory frequency from 1500 to 1250 or 1000MHz? Temperatures 65 and 63C, they are mining -100mV/1125 as we speak. Lowering mem speed rises memory controller load, at 1200MHz load is 100%. Lower more and hash starts declining. Overclocking mem to 1600MHz does nothing but drops MCL closer to 70%. Hashrate has stabilized to 61MH. |
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I use windows to mine on 4x gpu. No issues. Have tried both ubuntu and windows and decided to just stick on windows.
Fyi those 7970 lighnings go like bats out of caves. You can overclock to 1200 core easy for 27+hash.
This one goes to the same category with GTX 970 doing 21.5MH at 110W. |
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