[QUOTE=petrw1;391287]I don't think these are allowed in Canada. I'll have to check.[/QUOTE]

I have one. I'm in Canada.

[url]http://www.newegg.ca/Product/Product.aspx?Item=N82E16882715001[/url] has them for the cheapest price I've seen right now.

[QUOTE=petrw1;391287]I don't think these are allowed in Canada. I'll have to check.[/QUOTE]

The law would presumably be there because of fire hazard. I would certainly advise against running that kind of power through it 24/7 but I would also not be concerned with using it for long enough to get an idea of power consumption.

[QUOTE=petrw1;391287]I don't think these are allowed in Canada. I'll have to check.[/QUOTE]

Why would they be disallowed? It's just another appliance.

[QUOTE]The law would presumably be there because of fire hazard. I would certainly advise against running that kind of power through it 24/7 but I would also not be concerned with using it for long enough to get an idea of power consumption.[/QUOTE]

Funny you should mention that. I took mine out of constant use after discovering that it was melting and browning around the outlet part. It is a bit puzzling. I am not sure of their current rating, but I never exceeded 1000W going through it, and mostly it was around 800W.

[QUOTE=stars10250;391282]CPU (4 LL) + GTX 780 (1 CL) + GTX 780Ti (1 CL) 640 Watts[/QUOTE]
In Saskatchewan they call that a small space heater. It might be ok for a closet.

[QUOTE=Uncwilly;391369]In Saskatchewan they call that a small space heater. It might be ok for a closet.[/QUOTE]

Heat and overclocking are more complicated with these two cards. The cards seem to draw air at the face of the fans and exhaust it out what would be the front and back of the computer. Each card has two fans. One card draws fresh air while the other draws heated air from between the two cards. This makes their temperature different by about 10 degrees Celsius. I'm surprised they don't make the cards "mirror imaged," but then you'd have to buy a right and left card. I'm trying to balance overclock, temperature, and fan noise. I've decided on an acceptable fan noise which is 47% fan full rpm (fairly quiet), and an acceptable temperature limit which I picked as 75 degrees Celsius. The hotter card can't handle much of an overclock, and the cooler one I can overclock until it produces errors. By the way, on the topic of errors, this looks highly nonlinear. My error for that card is consistently 0.03 and then when the overclock is ever so slightly too high it jumps past 0.35. The calculation goes from being fine to critical without much in between. I'm using MSI Afterburner software to overclock, and GPUz as a secondary metric. I tried using ASUS GPU Tweak but it wouldn't let me control the overclock to the cards independently. It has a setting for syncing the cards or controlling them independently, but it always synced them in my case. Yes, this thing has become a California space heater and I'll likely need to slow it down in hot months. I think this is about the best I can do right now. The 970/980 are great for TF but the performance page lists them as slower for LL which is my interest. Titan is crazy expensive.

[QUOTE=stars10250;391372]The hotter card can't handle much of an overclock, and the cooler one I can overclock until it produces errors. By the way, on the topic of errors, this looks highly nonlinear. My error for that card is consistently 0.03 and then when the overclock is ever so slightly too high it jumps past 0.35. The calculation goes from being fine to critical without much in between. [/QUOTE]

There shouldn't be any 'in-between' for errors. The 0.03 is a roundoff error caused by the Fourier transforms used to do the calculation quickly. A larger FFT will have lower error, while a too-small FFT will have errors large enough that rounding might make the result off by 1 (and thus invalid). Errors jumping to 0.35 show you that you're getting calculation errors from the overclock, which are unacceptable in that any bitflip can produce an incorrect result. There is no rate of acceptable-bitflip errors but none, but there is a rate of acceptable roundoff errors (below 0.4, since a result of 0.5 is unclear which way to round). Your sudden 0.35 roundoff errors indicate bitflip errors from overclocking, and you should back well off from that edge of bad calculation.

Fan positioning is having a huge effect on temperatures. I tried six configurations of an extra fan. Five of the positions had almost no impact, one position dropped the temperature of the hot card by 13 degrees Celsius. Running one video card wasn't this complicated. Now the cards are running in the 60's C.

[QUOTE=stars10250;391431]Fan positioning is having a huge effect on temperatures. I tried six configurations of an extra fan. Five of the positions had almost no impact, one position dropped the temperature of the hot card by 13 degrees Celsius. Running one video card wasn't this complicated. Now the cards are running in the 60's C.[/QUOTE]

That sounds very good for two cards. The one on top will always tend to be hotter, but if they are reasonably close together in temps, that's fantastic.

Well, keep in mind this was a case-less setup. Today I mounted everything in an Antec 900 case and what a disaster that turned into. The video cards dwarfed everything else in the case and it took forever to get the wiring all neat and out of the airflow paths. I booted up and played with the fans for several hours but the card temps stayed around 77C. Keep in mind this is a case with 5 fans, one of which is 7" diameter. I was so mad I took everything out and set it back up on my desk the way I had it and card temps are both 65C again. I like it better this way. I can monitor dust buildup and I'm a lot closer to notice if anything is acting up.

[QUOTE=stars10250;391579]Well, keep in mind this was a case-less setup. Today I mounted everything in an Antec 900 case and what a disaster that turned into. The video cards dwarfed everything else in the case and it took forever to get the wiring all neat and out of the airflow paths. I booted up and played with the fans for several hours but the card temps stayed around 77C. Keep in mind this is a case with 5 fans, one of which is 7" diameter. I was so mad I took everything out and set it back up on my desk the way I had it and card temps are both 65C again. I like it better this way. I can monitor dust buildup and I'm a lot closer to notice if anything is acting up.[/QUOTE]

I think I will assemble my next system on an open frame.

I would search bitcoin mining forums for case/frame ideas.