What is the maximum fan speed acceptable ?

1337leet

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Quote from: Ayers on May 12, 2016, 01:02:12 AM

Quote from: 1337leet on May 11, 2016, 07:12:34 PM

Don't know if anyone came up with the argument that the cards consume less energy if they are colder.

I always run all my cards with 100% fanspeed.

My cards consume about 200 watts at 55 degrees celsius each. At 75 degrees it's more than 220 watts each.

With 5 cards you can save 100 watts just by running them at lower temoperatures.

oh didn't know about that, can you provide proof of this? temperature should not affect the consumption, otherwise all the big farm would consume a lot since they stack rig one above another

I do have a device that measures the energy consumtion at the wall.
I'm not quite sure how this works. But it's definitely fact that they consume less power if they are colder.

You can place rig over rig as long as the airtemperature is low.

I use a vent pointing at my rig to keep it cold. If I turn that vent off the temperature rises from like 55 to 70 degrees and I get ~ 100 watts more power consumption then.

QuintLeo

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Temperature DOES affect semiconductor power draw, hotter = more, this is actually very old news and is the cause of "thermal runaway" situations.

On realistic terms though, it's not a BIG effect. I'd worry more about "keep them cool to keep them lasting longer".

And like I've already mentions, GOOD fans don't die when run at 100% of design speed for quite a few YEARS - a good ball-bearing design should still be alive by the time the GPU it's on is almost worthless from being too old and outdated. It's the CHEAP sleeve bearing fans the DIE YOUNG (I count the derivitives as well, like "hyrdo" and such - they're stlll SLEEVE bering and reliant on being lubricated to not sieze up over time - ball bearing fans run FINE for long time with no lubrication at all, just don't let dust jam them up.

Ayers

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Quote from: 1337leet on May 11, 2016, 07:12:34 PM

Don't know if anyone came up with the argument that the cards consume less energy if they are colder.

I always run all my cards with 100% fanspeed.

My cards consume about 200 watts at 55 degrees celsius each. At 75 degrees it's more than 220 watts each.

With 5 cards you can save 100 watts just by running them at lower temoperatures.

oh didn't know about that, can you provide proof of this? temperature should not affect the consumption, otherwise all the big farm would consume a lot since they stack rig one above another

Tmdz

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Once you're in the green zone there is no point in over stressing the fans, the premature wear will cause the fan to die and put that card offline until you can acquire a new fan. That fan could also die and run hot enough to fry the board killing that gpu. So by trying to get a few C lower you could end up killing the board when you could have been kinder to the fan and gained longer life.

In a open air environment they should run very cool anyway unless the ambient is 80-90F

philipma1957

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Quote from: joblo on May 09, 2016, 05:16:56 PM

Quote from: philipma1957 on May 09, 2016, 04:25:06 PM

Quote from: Erkallys on May 09, 2016, 12:23:41 PM

Quote from: Ayers on May 09, 2016, 01:32:54 AM

i think 50-60, temp can rise to 70 without problem, gpu are build for higher temp, 50° is way too low as a margin i think, my fan are at 34% with additional external fan at 70%, temp is there at 65°

But isn't a lower temperature better ? I think, and it would sound pretty logical, that if it runs cooler, it will run also longer.

No No No No

^^For clear effect.^^

Too low due to maxing fans will kill the fans. 51 c is 10c too low. get a stable number at 60c to 65 c.

A little dramatic and misleading. Cooler HW is better period. It is better to wear out the fans than
burn out the GPU. Their cheaper to replace.

You make it seem like a cooler GPU is bad for the GPU which is just plain wrong. Over driving the fans
unneccessarily will shorten their life but won't hurt the GPU.

I said run your gpus at 61 to 65 c

If you think that is too high to run a gpu that's fine.

I owned about 75 mining gpus. Some of them where nuts to change out fans.

The hd7970 xfx was a beast to put on a new fan.

The hd7970 sapphires were easy to add heatsinks and fans.

I still run one sapphire hd7970 on eth coin now.
I mined btc then lite coin now eth coin with this card. I have a really good aftermarket cooler on it.

So a good deal is keep fans lower and cards warmer if they won't swap out when they die.

I never said run cards above 65c. Cards last years at 65c. Fans don't last years at 95 - 100 %

So if I have a choice running 51 c card with 100 % gpu fan

Or 63 c card with a 75% gpu fan and an external fan as I wrote in my post before .

I go for 63 c with a 75 % gpu fan and an external fan.

1337leet

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Don't know if anyone came up with the argument that the cards consume less energy if they are colder.

I always run all my cards with 100% fanspeed.

My cards consume about 200 watts at 55 degrees celsius each. At 75 degrees it's more than 220 watts each.

With 5 cards you can save 100 watts just by running them at lower temoperatures.

Unacceptable

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Merit: 1001

Quote from: Erkallys on May 11, 2016, 02:30:37 PM

Quote from: QuintLeo on May 11, 2016, 03:09:45 AM

Unless you can manage to get the card down to 0C ballpark (perhaps lower), there is no such thing as "too cold" - at worst, it's a tradeoff between "keep the fan alive" and "keep the card as cool as possible to improve card longevity".

Fans, relatively, are cheap - cards are NOT.

And yes, I've done the "twist tie a GOOD fan to a card with dead junk fans" trick a few times, most recently on most of my HIS HD 7750 cards (many of THOSE fans didn't last 6 months, but leftover Delta 60mm "CPU cooler for Athlon Thunderbird/XP" fans not only keep the cards noticeably cooler than the crap STOCK cooling ever managed, they should also last a VERY VERY long time even at the 100% can't control them speed they're running at.

The one HIS card I did NOT do that trick to died outright about 2 months after I bought the bloody thing - and it's still in the RMA process, HIS is BLOODY SLOW about that.

So I should increase the fan speed and change the fan once it died ? My hotter card is at 66°C. Is it too hot ?

I'd say yes Wink

Find fans on ebay via model # on the backside of the fan(mounting holes,fan diameter & amp draw,try to match this if model # can't be found),really cheap but most are in china & take awhile to get shipped to ya.

66c is ok,60c is better though Grin

My 7970 mines at 68c,anything below 70 is ok for me personally Wink

Erkallys

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Quote from: QuintLeo on May 11, 2016, 03:09:45 AM

Unless you can manage to get the card down to 0C ballpark (perhaps lower), there is no such thing as "too cold" - at worst, it's a tradeoff between "keep the fan alive" and "keep the card as cool as possible to improve card longevity".

Fans, relatively, are cheap - cards are NOT.

And yes, I've done the "twist tie a GOOD fan to a card with dead junk fans" trick a few times, most recently on most of my HIS HD 7750 cards (many of THOSE fans didn't last 6 months, but leftover Delta 60mm "CPU cooler for Athlon Thunderbird/XP" fans not only keep the cards noticeably cooler than the crap STOCK cooling ever managed, they should also last a VERY VERY long time even at the 100% can't control them speed they're running at.

The one HIS card I did NOT do that trick to died outright about 2 months after I bought the bloody thing - and it's still in the RMA process, HIS is BLOODY SLOW about that.

So I should increase the fan speed and change the fan once it died ? My hotter card is at 66°C. Is it too hot ?

Unacceptable

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Quote from: QuintLeo on May 11, 2016, 03:09:45 AM

Unless you can manage to get the card down to 0C ballpark (perhaps lower), there is no such thing as "too cold" - at worst, it's a tradeoff between "keep the fan alive" and "keep the card as cool as possible to improve card longevity".

Fans, relatively, are cheap - cards are NOT.

And yes, I've done the "twist tie a GOOD fan to a card with dead junk fans" trick a few times, most recently on most of my HIS HD 7750 cards (many of THOSE fans didn't last 6 months, but leftover Delta 60mm "CPU cooler for Athlon Thunderbird/XP" fans not only keep the cards noticeably cooler than the crap STOCK cooling ever managed, they should also last a VERY VERY long time even at the 100% can't control them speed they're running at.

The one HIS card I did NOT do that trick to died outright about 2 months after I bought the bloody thing - and it's still in the RMA process, HIS is BLOODY SLOW about that.

I wired the cpu fan to be fully controlled,a little solder & shrink tube Wink

PowerColor was a problem for me,RMA took 8 months..........never again Angry

QuintLeo

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Unless you can manage to get the card down to 0C ballpark (perhaps lower), there is no such thing as "too cold" - at worst, it's a tradeoff between "keep the fan alive" and "keep the card as cool as possible to improve card longevity".

Fans, relatively, are cheap - cards are NOT.

And yes, I've done the "twist tie a GOOD fan to a card with dead junk fans" trick a few times, most recently on most of my HIS HD 7750 cards (many of THOSE fans didn't last 6 months, but leftover Delta 60mm "CPU cooler for Athlon Thunderbird/XP" fans not only keep the cards noticeably cooler than the crap STOCK cooling ever managed, they should also last a VERY VERY long time even at the 100% can't control them speed they're running at.

The one HIS card I did NOT do that trick to died outright about 2 months after I bought the bloody thing - and it's still in the RMA process, HIS is BLOODY SLOW about that.

Erkallys

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Quote from: QuintLeo on May 10, 2016, 02:05:01 AM

It depends a TON on the fan itself. If it's a good ball-bearing design like all of my EVGA and Sapphire cards have had, or the blower in my HIS IceQ or ANY Delta fan I know of, it should last a very very long time even at 80-90% (my sapphire HD7750 has run 80 or 85% for almost 3 YEARS now no issues).

If it's a cheap non-ball-bearing fan like all of my other HIS cards used, 60% for less than a year might be enough to kill the bloody worthless things.

I have some Sapphire, so I should have this system. Does it mean that I can run it at 75% like I used to do ? If I put them at 55%, the cards jump at a temperature between 58°C for the cooler and 66°C for the hotter. Better ?

Unacceptable

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Quote from: Ayers on May 10, 2016, 01:36:19 AM

Quote from: Unacceptable on May 09, 2016, 04:34:22 PM

I guess I've been lucky,only 2 fans died out of 15-20 vid cards & one was an old 5870 squirrel fan from WAY back,both were run at about 80%.

but for how much they were running? i doubt they can last year in that condition, i like to set them at 50% if temp allow this, it's a good compromise i think

The XFX 5870 I had for 2 years(bought used on ebay,fan died a year after I bought it)sold on ebay,the XFX 6950 with one fan in the middle was 4 years,just ziptied a CPU fan to it.
5 other 6950's still worked fine when sold on ebay.

I had 6 XFX 6970's for 3 years & sold on ebay,fans still worked when sold.8 VisionTek 7970's for 3 years,fans worked when I sold 7 of em.Still have one for mining & gaming backup GPU.

The XFX 6950's & 6970's were lifetime guarantee's & haven't heard from anyone wanting me to send em back for repairs....yet Cheesy

QuintLeo

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It depends a TON on the fan itself. If it's a good ball-bearing design like all of my EVGA and Sapphire cards have had, or the blower in my HIS IceQ or ANY Delta fan I know of, it should last a very very long time even at 80-90% (my sapphire HD7750 has run 80 or 85% for almost 3 YEARS now no issues).

If it's a cheap non-ball-bearing fan like all of my other HIS cards used, 60% for less than a year might be enough to kill the bloody worthless things.

Cakalasia

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I will just use up to 50% for the fan to keep the temperature around 70 degree C. If it cannot, I will reduce the power consumption of the cards.

Ayers

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Quote from: Unacceptable on May 09, 2016, 04:34:22 PM

I guess I've been lucky,only 2 fans died out of 15-20 vid cards & one was an old 5870 squirrel fan from WAY back,both were run at about 80%.

but for how much they were running? i doubt they can last year in that condition, i like to set them at 50% if temp allow this, it's a good compromise i think

joblo

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Quote from: philipma1957 on May 09, 2016, 04:25:06 PM

Quote from: Erkallys on May 09, 2016, 12:23:41 PM

Quote from: Ayers on May 09, 2016, 01:32:54 AM

i think 50-60, temp can rise to 70 without problem, gpu are build for higher temp, 50° is way too low as a margin i think, my fan are at 34% with additional external fan at 70%, temp is there at 65°

But isn't a lower temperature better ? I think, and it would sound pretty logical, that if it runs cooler, it will run also longer.

No No No No

^^For clear effect.^^

Too low due to maxing fans will kill the fans. 51 c is 10c too low. get a stable number at 60c to 65 c.

A little dramatic and misleading. Cooler HW is better period. It is better to wear out the fans than
burn out the GPU. Their cheaper to replace.

You make it seem like a cooler GPU is bad for the GPU which is just plain wrong. Over driving the fans
unneccessarily will shorten their life but won't hurt the GPU.

Unacceptable

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I guess I've been lucky,only 2 fans died out of 15-20 vid cards & one was an old 5870 squirrel fan from WAY back,both were run at about 80%.

philipma1957

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Quote from: Erkallys on May 09, 2016, 12:23:41 PM

Quote from: Ayers on May 09, 2016, 01:32:54 AM

i think 50-60, temp can rise to 70 without problem, gpu are build for higher temp, 50° is way too low as a margin i think, my fan are at 34% with additional external fan at 70%, temp is there at 65°

But isn't a lower temperature better ? I think, and it would sound pretty logical, that if it runs cooler, it will run also longer.

No No No No

^^For clear effect.^^

Too low due to maxing fans will kill the fans. 51 c is 10c too low. get a stable number at 60c to 65 c.

Most of us have open case rig with risers. Use a box fan for extra cooling

or if you have a closed cased rig put in a strong exhaust fan in the case. like this one.

http://www.amazon.com/Sanyo-Denki-SAN-Ace-120mm/dp/B00YOC80IO?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

or this one

http://www.amazon.com/Scythe-DFS123812H-3000-Ultra-Kaze-120mm/dp/B001JKNMBE/

but do not use the motherboard to power it use a molex from the psu.

Unacceptable

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Quote from: Erkallys on May 09, 2016, 12:23:41 PM

Quote from: Ayers on May 09, 2016, 01:32:54 AM

i think 50-60, temp can rise to 70 without problem, gpu are build for higher temp, 50° is way too low as a margin i think, my fan are at 34% with additional external fan at 70%, temp is there at 65°

But isn't a lower temperature better ? I think, and it would sound pretty logical, that if it runs cooler, it will run also longer.

I've always kept my vid cards at 60c(try to,no higher than 68 on some),most my fans run 80% or less to do so.

That is where the sweet spot in temp is,I read this about 3-4 years ago in a tech review somewhere Wink

90c is the danger zone for sure,so as Ayers said 70 should be set as the max.

Erkallys

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Quote from: Ayers on May 09, 2016, 01:32:54 AM

i think 50-60, temp can rise to 70 without problem, gpu are build for higher temp, 50° is way too low as a margin i think, my fan are at 34% with additional external fan at 70%, temp is there at 65°

But isn't a lower temperature better ? I think, and it would sound pretty logical, that if it runs cooler, it will run also longer.

Topic: What is the maximum fan speed acceptable ? (Read 1561 times)