[QUOTE=TheJudger;393851]Compute Capability 3.[B][COLOR="Red"]7[/COLOR][/B] anyone? Seems I was right, Tesla K80 is 3.7. So K80 is not Titan Z?![/QUOTE]I've added some Tesla's to my [url=http://www.mersenne.ca/mfaktc.php]mfaktc performance chart[/url]. Assuming mfaktc performance is the same between Compute 3.5 and 3.7 K80 comes slightly ahead of Titan-Z for only 300% the price :smile:
Since you seem curious about it, [url=http://www.anandtech.com/show/8729]this article[/url] covers the K80 specifically.

[QUOTE=tha;393867]- What does the -v(erbose) option do, I did not notice a difference between 0 and 1?[/QUOTE]
Changes the verbosity (NOT the per class status line)
[QUOTE=tha;393867]- How do I limit the output to say once per 20% progress instead of 0,1%?[/QUOTE]
Actually it is every ~0.1041667% (exact 1/960) but that's not the point. You can't change without code changes.

Oliver

Now that I am once again running a GTX 580 and a 570, I am reminded of an odd-seeming phenomenon. In the attached shot, one can see that the 570 actually starts a bit faster than the 580 (it is clocked higher.) In the first few minutes it looses about 20 GHz-d/d, while the 580 holds fairly steady. This is without P95 running, which takes off about 5 GHz-d/d from both processors. That I can live with, though it is puzzling, as mfaktc instances seem to use no more that 0.06% CPU time.

The more substantial reduction on the secondary card (570) bothers me more. Both cards are reported running at 16x PCIe. The 570 runs ~10 C cooler than the 580, (70 vs. 80 C), so it doesn't seem that heat should be involved.

Is this a known behavior of which I have missed the discussion? Could it be specific to the GTX 570 architecture? I'd love to get that 20 GHz-d/d full time, if I can.

Something similar happens with the 570 running solo. The GHz-d/d stabilized at ~434 with Sieve Primes at both 82485 (default,) and 75061.

Damn... I gotta look into overclocking my 580's.

[QUOTE=kladner;394286]Is this a known behavior of which I have missed the discussion? Could it be specific to the GTX 570 architecture? I'd love to get that 20 GHz-d/d full time, if I can.[/QUOTE]
I never met that phenomenon. I "cycled" many 580's through my hands, and few 570's too, and currently have 4 pieces of 580's, all factory overclocked at 781MHz, all water cooled, running very stable at 428-433 GHzD/D, with P95 running. Unfortunately they are not mfaktc-ing all the time, sometime they do real life work...

[QUOTE=Mark Rose;394295]Damn... I gotta look into overclocking my 580's.[/QUOTE]

This one is factory OC at 797 MHz. It can run at 844 solo, though as the top card in the case, it starts creeping past 85 C with both running. :no:

EDIT: That is all at stock voltage. As the only card where heat was less of a problem, I had an Asus 580 which would run at 861 @ stock V, and 872 @ the smallest available voltage increment up. Unfortunately, it suffered some kind of damage during a major case reorganization. It will still boot into Windows, but falls apart if I try to run mfaktc on it. I'm now running an EVGA card with an aftermarket cooler.

[QUOTE=kladner;394298]This one is factory OC at 797 MHz. It can run at 844 solo, though as the top card in the case, it starts creeping past 85 C with both running. :no:

EDIT: That is all at stock voltage. As the only card where heat was less of a problem, I had an Asus 580 which would run at 861 @ stock V, and 872 @ the smallest available voltage increment up. Unfortunately, it suffered some kind of damage during a major case reorganization. It will still boot into Windows, but falls apart if I try to run mfaktc on it. I'm now running an EVGA card with an aftermarket cooler.[/QUOTE]

How do you get them so cold? :D

My top GTX 580 at 772 MHz is running at 89C.

My bottom GTX 580 at 797 MHz is running at 92C (factory OC).

Both are shrouded EVGA devices.

[QUOTE=Mark Rose;394299]How do you get them so cold? :D

My top GTX 580 at 772 MHz is running at 89C.

My bottom GTX 580 at 797 MHz is running at 92C (factory OC).

Both are shrouded EVGA devices.[/QUOTE]

I've never had a shrouded card (assuming that means "single blower, rear exhaust"). I am a little surprised at those numbers. I have always assumed that, with less GPU heat dumped in the case, such cards have an advantage. (I also thought that Canadian room temperatures would keep those bad boys cool as cucumbers. :razz:)

I currently have two 140mm front intakes, and a 140mm side intake. I try to maintain positive pressure in the case, so a bit of hot air gets forced out directly from the cards. I have two 80mm Antec "spot fans" in the case. For a long time, both of those were set to blow air between the cards. Right now, I am experimenting with the spot fan which is right in line with the side intake blowing in, and the one nearer the front of the case drawing air out from between and throwing it upward.

The exhausts are a 140mm top rear, two 120mm radiator fans blowing out the top, and the PSU. Consequently, I'm only dealing with GPU heat and some minor sources in the case. My present setup is the result of obsessive tweaking, especially of the spot fans. Positioning relative to the GPU fans makes a big difference.

Without knowing what your arrangement is, I would venture that forcing more air into the case, either from the front or the side panel, might help. Water cooling the CPU with the radiator fan(s) exhausting would reduce internal heat load, but you have to have enough intake flow to feed all those "suckers."

Then too, water cooling plates for the GPUs turn up fairly often on Ebay. Even doing one of the cards could make a difference.

It is weird, to me, that the bottom card is hotter. That makes it seem that it may be starved for fresh air.

I have tried for a long time to imagine an air source whose output matches the critical "between the cards" space. Given the limited space between the tops of the cards and the side panel, this would almost have to be a centrifugal blower with a customized duct shaped to the narrow opening. If I went that far, it would make the most sense to arrange the blower to draw outside air.

[QUOTE=kladner;394317]I also thought that Canadian room temperatures would keep those bad boys cool as cucumbers. :razz:[/QUOTE]My pair of GTX 670s are running at 73°C / 75°C (the hotter one is factory-clocked a bit faster), if that makes you feel any better.
I'm also sitting here in a coat and toque, with a portable heater pointed at my keyboard to keep my fingers defrosted. :rajula:

[QUOTE=kladner;394317]I've never had a shrouded card (assuming that means "single blower, rear exhaust"). I am a little surprised at those numbers. I have always assumed that, with less GPU heat dumped in the case, such cards have an advantage. (I also thought that Canadian room temperatures would keep those bad boys cool as cucumbers. :razz:)[/quote]

This is the office computer. The room temperature is about 22°C. Shroud coolers make sense in theory, in that they dump air outside of the case, but the amount of air they move is less than two or three fan coolers. Plus they are noisy (centrifugal fans are kind of shaped like air raid sirens).

[quote]
I currently have two 140mm front intakes, and a 140mm side intake. I try to maintain positive pressure in the case, so a bit of hot air gets forced out directly from the cards. I have two 80mm Antec "spot fans" in the case. For a long time, both of those were set to blow air between the cards. Right now, I am experimenting with the spot fan which is right in line with the side intake blowing in, and the one nearer the front of the case drawing air out from between and throwing it upward.

The exhausts are a 140mm top rear, two 120mm radiator fans blowing out the top, and the PSU. Consequently, I'm only dealing with GPU heat and some minor sources in the case. My present setup is the result of obsessive tweaking, especially of the spot fans. Positioning relative to the GPU fans makes a big difference.

Without knowing what your arrangement is, I would venture that forcing more air into the case, either from the front or the side panel, might help. Water cooling the CPU with the radiator fan(s) exhausting would reduce internal heat load, but you have to have enough intake flow to feed all those "suckers."
[/quote]

I have a 140 mm exhaust fan at the top back, a 140 mm intake in front of the power supply, a 140 mm intake in front of the upper 3.5" bays, and a 140 mm intake on the door that blows approximately between the two cards (perhaps a little more on the top one). I've removed all the extra PCI covers to let air blow over the cards and to increase airflow through the case. The CPU, a 4770, run 3 cores of mprime. The power supply vents out the back but also produces about 150 watts of waste heat to produce the 600 or so watts consumed by the system, and some of that radiates inside the case. Its top side is also cooled somewhat by the airflow of the door fan. The air coming out of the cards feels approximately the same speed as the air coming out of the PCI slots.

[quote]
Then too, water cooling plates for the GPUs turn up fairly often on Ebay. Even doing one of the cards could make a difference.
[/quote]

I looked into it when LaurV was threatening to give away two water cooled GTX 580's. The cost of the additional water cooling components would be almost as much as buying two new GTX 580's.

[quote]
It is weird, to me, that the bottom card is hotter. That makes it seem that it may be starved for fresh air.
[/quote]

It's clocked slightly higher and has hot components on both sides. The top card only had the bottom card to contend with. The CPU heatsink is relatively cool in comparison.

Oh, and the bottom card is a PNY. I thought it was EVGA. I bought it and plugged it in and forgot about it :D