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doof (OP)
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February 12, 2014, 03:09:26 AM |
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For light coin mining, I notice when i first start my 290x's the hash is very high, the quickly drops. Is this because of heat? Does investing in water cooling or novec improve the hash rate? And if so, by what coefficient? Just trying to work out ROI. Spend $300 on cooling, or just buy another GPU.
I've tried to find some tests, but can't find any good results online.
Im sure this has been discussed on here, but can't find a thread.
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backtrackit
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February 12, 2014, 03:11:08 AM |
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It's possible that your cards are throttling back the clocks. What temp does your card's hit
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wpgdeez
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February 12, 2014, 04:41:17 AM |
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You will get a more constant rate without throttling and a lower power draw at the wall.
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backtrackit
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February 12, 2014, 04:48:35 AM |
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You will get a more constant rate without throttling and a lower power draw at the wall.
How do you get lower power draw at the wall without throttling. Surely the card uses more power when running at 100%. |
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hurricandave
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February 12, 2014, 08:59:05 PM |
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Hash rate almost always appears high when you start GPU mining any coin. The more time you run the closer to actual speed the miner software gets. Keep an eye on the actual temps thru catalyst and you will see it quickly rise then even out. My exp. is a well placed case fan that helps feed the card cooling fan will help knock off 5-10 Celsius. Just don't get the idea that if you lower the temps that you can instantly increase accepts, you want to find your cards sweet spot, which means pumping up the speed won't always translate to more coin, work from 12 and 24 hour averages.
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sandor111
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February 13, 2014, 02:08:57 AM |
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Less heat means less power draw.
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backtrackit
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February 13, 2014, 02:39:50 AM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat |
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Winalunt
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February 13, 2014, 04:23:39 AM |
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Cooling is only prevent your graphic card get burned ... $300 to protect $1000 or more
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jongameson
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February 13, 2014, 12:47:07 PM |
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I destroyed my 7950 in less than a month by not cooling
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Gator-hex
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February 13, 2014, 01:02:37 PM |
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You can run higher clocks by increasing the cooling, but like you suspect, the return on investment is better served by running more cards slower.
I really recommend the R9 270, the two fan versions, it's 1280 SPUs, for only a single 75W 6-Pin PCI-E.
It's the number of SPU's you have that effect MH/s the most!
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nyana
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February 13, 2014, 01:10:26 PM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat He´s right...LESS HEAT = LESS POWER CONSUMPTION the electric resistance drops on colder GPU = lower power a hotter GPU needs more Energy for same work as a cold GPU nyana |
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backtrackit
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February 13, 2014, 04:57:00 PM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat He´s right...LESS HEAT = LESS POWER CONSUMPTION the electric resistance drops on colder GPU = lower power a hotter GPU needs more Energy for same work as a cold GPU nyana Yea if it's supercooled with nitrogen or something lol a few degrees c aint gonna make you use less power. |
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stephenm
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February 13, 2014, 07:23:30 PM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat He´s right...LESS HEAT = LESS POWER CONSUMPTION the electric resistance drops on colder GPU = lower power a hotter GPU needs more Energy for same work as a cold GPU nyana Lower die temperatures => lower electronic impedance => lower heat generated = lower current consumption (hence power draw). |
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stephenm
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February 13, 2014, 07:27:59 PM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat He´s right...LESS HEAT = LESS POWER CONSUMPTION the electric resistance drops on colder GPU = lower power a hotter GPU needs more Energy for same work as a cold GPU nyana Yea if it's supercooled with nitrogen or something lol a few degrees c aint gonna make you use less power. no need for exotic cooling. Any liquid cooling solutions will easily bring the GPU temperature by 30-40C or more depending on the block / gpu. not only this is noticeable reduction power draw in general, but this is especially true when we're talking about a rig working 24/7. Helps with the life of the GPU and it'll make the PC a lot less noisy. (just in case noobs with AIO coolers for their CPU come in claiming there is no 30-40C difference between their air cooled CPU and their now liquid cooled CPU: we're talking about GPU's here and that's completely different (if you don't know, just read about how widely different CPu and GPU thermal fluxes are). |
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backtrackit
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February 13, 2014, 08:19:59 PM |
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Less heat means less power draw.
lol it's the other way around, less power draw = less heat He´s right...LESS HEAT = LESS POWER CONSUMPTION the electric resistance drops on colder GPU = lower power a hotter GPU needs more Energy for same work as a cold GPU nyana Yea if it's supercooled with nitrogen or something lol a few degrees c aint gonna make you use less power. no need for exotic cooling. Any liquid cooling solutions will easily bring the GPU temperature by 30-40C or more depending on the block / gpu. not only this is noticeable reduction power draw in general, but this is especially true when we're talking about a rig working 24/7. Helps with the life of the GPU and it'll make the PC a lot less noisy. (just in case noobs with AIO coolers for their CPU come in claiming there is no 30-40C difference between their air cooled CPU and their now liquid cooled CPU: we're talking about GPU's here and that's completely different (if you don't know, just read about how widely different CPu and GPU thermal fluxes are). So the water cooling uses no power then? I really doubt you get lower power draw just from water cooling especially taking into account the extra wattage from water pump and extra fans not in a measurable way. |
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stephenm
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February 13, 2014, 09:51:15 PM |
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of course the pump will add some power draw but not as much as what you are gaining from the lower GPU temperatures.
plenty of GPU reviews that show power draw and temperatures you'll see the correlation. a quick search shows that on a R9-290X, 20C differences can reduce the power draw by up to 30W (on load of course). Multiply that by a few graphics cards, add a CPU in the loop and you can see relevant drops in power draw.
Note that LC pumps are typically 12-15W at full speed, but you'll see if you actually get into it someday that you don't need the pump running higher than half speed - especially on a GPU.
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haploid23
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February 13, 2014, 10:07:53 PM |
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Yea if it's supercooled with nitrogen or something lol a few degrees c aint gonna make you use less power.
So the water cooling uses no power then? I really doubt you get lower power draw just from water cooling especially taking into account the extra wattage from water pump and extra fans not in a measurable way.
Hey dude stop talking out of your ass. It's a known fact that cooler dies draw less power because of thermal resistivity. I personally watched a 55w power drop in a GTX480 as it was cooled from 100C down to 65C. To answer the OP directly, you don't get a higher hash rate if you run your cards cooler, as long as temps aren't high enough where your cards will throttle. You do however save on power consumption, or give you a little more headroom for overclocking and stability. |
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