Pictures of your mining rigs!

[forcefedvr6]

Have more recently added a second (identical) fan at the other end, and put 25mm risers on the m-board to lift it slightly

this is the newer configuration with risers and second fan (also, PSU is lit up)
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Adding a second fan in that configuration is actually reducing your total volume of airflow through the housing.  You would need to make a larger housing and position the fans next to each-other at one end of the housing if you want a larger volume of air to pass over the card.  You are probably seeing an increase in air velocity due to the restriction that you have employed,  but you could achieve that same effect by using one fan and reducing diameter of the housing at the exhaust end. 

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[rampalija]

Have more recently added a second (identical) fan at the other end, and put 25mm risers on the m-board to lift it slightly

this is the newer configuration with risers and second fan (also, PSU is lit up)

Adding a second fan in that configuration is actually reducing your total volume of airflow through the housing.  You would need to make a larger housing and position the fans next to each-other at one end of the housing if you want a larger volume of air to pass over the card.  You are probably seeing an increase in air velocity due to the restriction that you have employed,  but you could achieve that same effect by using one fan and reducing diameter of the housing at the exhaust end. 
[/quote]



Remove the housing, cuz the hot air is lighter than cold air. And hot air goes up

[Trillium]

Assuming the fans are both orientated in identical directions, eg  --> and --> then the overall flow will be very slightly improved. I disagree with the comment above that it is actually reducing it: you are creating suction on one end not in fact restricting flow in any way, it is actually enhancing flow through the mid point of the tube.

You can see the same effect with tower CPU coolers that are designed to accept fans mounted on either side. In summary:

Code:

▓ = heatsink, ▌= fan
--> direction of airflow in below diagrams

Code:

▐▓ gives good performance
▐▓▌gives very slightly better performance than above
 ▓▌(suction-only through heatsink) gives poor performance

The benefit of using the configuration shown in the middle is so small, that usually its not even worth the extra money for a second fan. In all the overclocked rigs I've setup, it usually offers no more than 1-2 degrees C lower temps when under load. I should add though, that the dual-fan configuration is beneficial in case a fan fails: if the single fan dies while you are not paying attention then your miner will possibly get really hot (and maybe burn out, depending on what it is).

Remove the housing, cuz the hot air is lighter than cold air. And hot air goes up

Yes, that will help you pass junior grade physics, but in practical small scale applications like this, air density effects make very little difference when it is being forced by fans.

[whitemage]

...
The back of one of my GPUs looked like this after a capacitor randomly fired a stream of sparks at me and burst into flames.

Did you try just replacing the cap?

I wouldn't know what value cap to replace it with, what would you suggest? It's a HIS HD5830 if that makes any difference.

It looks like that you will have to buy a new one

That sucks, is it still under RMA?

[Sythyn]

Took the arctic freezer pro off of my BE in order to make it look like a mini blade!


It sits on top of this, (old pic, more fans and closed case now)


The back of one of my GPUs looked like this after a capacitor randomly fired a stream of sparks at me and burst into flames.

Is this Gigabyte GPU? Most graphic card that have this problem is Gigabyte, they seem to lack the quality....

[malevolent]

although as that card was never very popular with either gamers or miners your chances here are not great either. 

HD 5830 actually was actually quite popular among the miners, it usually had a good price:speed ratio, though there was less demand for it at times when the BTC price:difficulty ratio was getting worse because 5830 is a power hungry GPU.

[whitemage]

although as that card was never very popular with either gamers or miners your chances here are not great either. 

HD 5830 actually was actually quite popular among the miners, it usually had a good price:speed ratio, though there was less demand for it at times when the BTC price:difficulty ratio was getting worse because 5830 is a power hungry GPU.

You mean like few years back? I though HD 5850 and HD 5870 is much better in term of hash/price?

[forcefedvr6]

[/quote]

Assuming the fans are both orientated in identical directions, eg  --> and --> then the overall flow will be very slightly improved. I disagree with the comment above that it is actually reducing it: you are creating suction on one end not in fact restricting flow in any way, it is actually enhancing flow through the mid point of the tube.

What you are missing is that the fan blades of the second fan are actually causing a huge restriction in that configuration.

Your example of a push/pull configuration in a box/tower is creating more internal turbulence than a single fan, and you are probably getting more complete air movement *within* the box,  but if the box is otherwise sealed, you certainly aren't moving any more air in or out of the box due to having a second fan placed in the exhaust port. In fact you are moving much less out of it due to the fan being there and causing a restriction.

If you want to increase CFM with multiple fans,  then you would have to provide an individual matched intake and exhaust port for *each* fan.  Always have matched ports for each fan or expect to pay significant penalties in the form of CFM.

[malevolent]

although as that card was never very popular with either gamers or miners your chances here are not great either. 

HD 5830 actually was actually quite popular among the miners, it usually had a good price:speed ratio, though there was less demand for it at times when the BTC price:difficulty ratio was getting worse because 5830 is a power hungry GPU.

You mean like few years back? I though HD 5850 and HD 5870 is much better in term of hash/price?

HD 5870 weren't usually that good in terms of speed/price but they were quite good in terms of speed/power draw, and using them meant savings on motherboards/RAM/CPU because there's a limited amount of free PCI-E slots on each motherboard.

I'm not saying it was always like that with 58xx GPUs, but in general it was how I described.

5830 were cheap but not so appealing when it meant they would take up more space and draw more power.
5870 were expensive but they would take up a lot less space.
5850 were a good balance between those two.

[qwertzlcoatl]

A way to use waste heat from an ASIC to keep an aquaponics fish tank from freezing: https://www.youtube.com/watch?v=Zsh-vbgwKNE

 

[molecular]

A way to use waste heat from an ASIC to keep an aquaponics fish tank from freezing: https://www.youtube.com/watch?v=Zsh-vbgwKNE

 

very cool shit, bro!

somet grabs from the vid:

[klondike_bar]

Assuming the fans are both orientated in identical directions, eg  --> and --> then the overall flow will be very slightly improved. I disagree with the comment above that it is actually reducing it: you are creating suction on one end not in fact restricting flow in any way, it is actually enhancing flow through the mid point of the tube.

What you are missing is that the fan blades of the second fan are actually causing a huge restriction in that configuration.

Your example of a push/pull configuration in a box/tower is creating more internal turbulence than a single fan, and you are probably getting more complete air movement *within* the box,  but if the box is otherwise sealed, you certainly aren't moving any more air in or out of the box due to having a second fan placed in the exhaust port. In fact you are moving much less out of it due to the fan being there and causing a restriction.

If you want to increase CFM with multiple fans,  then you would have to provide an individual matched intake and exhaust port for *each* fan.  Always have matched ports for each fan or expect to pay significant penalties in the form of CFM.

the reason for my setup is that the exhaust fan was accidentally attached to the housing in a pull direction, rather than a push as i would have preferred (and im too lazy to spend 20min fixing it the other way lol). The fan on the left (push) is actually at about a 30 degree angle so that not only does it direct the entering airflow onto the back of the board and its heatsinks, but there is a gap available in the opening so that if the fans run different speeds, some airflow can enter/escape there to minimise any issues with mismatched CFM. putting my hand by it indicates that there is no noticed flow/scution at the gap so the CFM of the 2 fans must be very similar.  in either case, im able to push the card for almost all its potential - theres maybe 1-2GH more i could squeeze if my living room wasnt 22 degrees (C) and was just a bit cooler - but not a big deal IMO

[rupy]

The three elements; bitcoin, fire and water. Heating the house is complex noise-wise, going to try and rotate the aluminium heatsinks 90 degrees soon so I can remove the sideways fan.

[rampalija]

Without this everything would be almost impossible

[maxl]

And never forget this  :

[rampalija]

And never forget this  :

and that AMERICAN TAPE is so good and strong tape. Not good look but it does the job

[arklan]

American tape?

[rampalija]

American tape?

TRY google it!

Yeah, that is the name of this one in my country!

[pontiacg5]

This is what I've been working on all weekend.

Winwoes is fighting like a beast, so I'm having to learn new things to get this going.








And of course the initial design 



My services are always for hire, too 

[Cablez]

Are those USB to PCIE 1x risers?  Cool.  Where did you source those?