Wow! That's a Fractal Design R4! That's what I have. I used to have the bottom intake until I got a monster PSU that was longer than I expected. I am hoping that I can turn my large drive bay back the way you have yours. I had to turn it sideways while I had the Asus 580 in residence. I think I would get more air through, even with all the drives in there.

[QUOTE=James Heinrich;394328]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]

OW! This Texas Gulf Coast native would suffer under those conditions. Chicago stresses me enough as it is.

[QUOTE=kladner;394391]Wow! That's a Fractal Design R4! That's what I have. I used to have the bottom intake until I got a monster PSU that was longer than I expected. I am hoping that I can turn my large drive bay back the way you have yours. I had to turn it sideways while I had the Asus 580 in residence. I think I would get more air through, even with all the drives in there.[/QUOTE]

Yep! And my desktop at home is encased in a white R4. Good case.

Turning the drive cage and putting the front fan in the upper position helped tremendously with air flow. More than I expected it would. I had to move the rubber grommets in the sleds to the other position to get them to sit deep enough to not collide with the 580's. I'm not sure how well it would work if there were actually drives in the cage. At home I have the cage populated and turned in the "normal" position, but I've also only got a third of the heat to deal with.

I think I have pretty much solved the issue of the GTX 570 slowing down 20-22 GHz-d/d from its starting speed. First, I experimented extensively with GPU Sieve Primes. While the 580 seems to do best at the default of 82485, the 570 proved to like 55605 better. 45365 is too low.

I have long run GPUSieveSize=128, and that turns out to be the best for both cards.

The change which really reduced the speed drop was changing GPUSieveProcessSize from 8 to 16. The top speed fell off at 24. 16 also benefited the 580, but only by a few GHz-d/d. However, though throughput was improved, the temperature actually dropped a degree C or two. The upshot is that the cards are running such that their total throughput is now about 915 GHz-d/d instead of the ~860 I was getting before, while the temps are slightly better. The 850 is now running at 823 MHz at 81 C, and producing 545 GHz-d/d. The 570 at 872 MHz is putting out ~452 GHz-d/d and holding at 70 C. While the 570 is the bottom card, it is interesting that it is running 11 C cooler for essentially the same throughput.

The attachment shows the 570 at startup with P95 fully engaged with two DCs and six P-1s, which include two or three doing Stage 2, with the assigned memory fully occupied. As I said before, P95 takes off about 5-7 GHz-d/d off for each GPU, but this is the best tuned I've ever had the combination of GPUs and CPU.

[QUOTE=kladner;394499]The change which really reduced the speed drop was changing GPUSieveProcessSize from 8 to 16. The top speed fell off at 24. 16 also benefited the 580, but only by a few GHz-d/d. However, though throughput was improved, the temperature actually dropped a degree C or two. The upshot is that the cards are running such that their total throughput is now about 915 GHz-d/d instead of the ~860 I was getting before, while the temps are slightly better. The 850 is now running at 823 MHz at 81 C, and producing 545 GHz-d/d. The 570 at 872 MHz is putting out ~452 GHz-d/d and holding at 70 C. While the 570 is the bottom card, it is interesting that it is running 11 C cooler for essentially the same throughput.[/QUOTE]

Have you had any success in lowering the temperatures by reducing the memory clock? I've not played around with the clocks in my graphics cards, but I'm getting tempted to install the updated Nvidia drivers for Linux that enable clock changing. I'm only getting 424 and 428 or so out of my GTX 580's. Seems I am leaving a lot on the table!

[QUOTE=kladner;394499]The change which really reduced the speed drop was changing GPUSieveProcessSize from 8 to 16. The top speed fell off at 24. 16 also benefited the 580, but only by a few GHz-d/d. However, though throughput was improved, the temperature actually dropped a degree C or two.[/QUOTE]

Changing GPUSieveProcessSize from 8 to 16 slowed down each half of my 690 by 30 for a total loss of 60 GHzD/D. Wish we had a configuration utility that would work through all the various settings and come up with the best setting.

[QUOTE=Mark Rose;394506]Have you had any success in lowering the temperatures by reducing the memory clock? I've not played around with the clocks in my graphics cards, but I'm getting tempted to install the updated Nvidia drivers for Linux that enable clock changing. I'm only getting 424 and 428 or so out of my GTX 580's. Seems I am leaving a lot on the table![/QUOTE]

The memory is at 1598 MHz for both cards. I would have to experiment to see how much effect that is having. I have had that setting since hot weather.

[QUOTE=kladner;394499][B]The 850 is now running at 823 MHz at 81 C, and producing [U]545[/U] GHz-d/d.[/B].[/QUOTE]

Oops. I think I transposed numbers. I have the.....wait a minute. I don't think I would have committed [I]two transpositions [/I]in the same sentence.


The [B][U]580[/U][/B] is indeed running at 823 MHz ATM, and putting out [B][U]456[/U][/B] GHz-d/d. It is at 80 C.

Until I changed it for this test, it was running at 844 MHz, mfaktc reporting 469 GHz-d/d, at 81 C. :smile:

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

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]

Looking at your case photos and reading your descriptions, I can say that one big factor is that I have more powerful case fans. I have both front fan slots filled with [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835553007"][B]Cougar[/B] [/URL]1200 rpm fans, which are relatively subdued but put out a lot. They have a lot of the aerodynamic bells and whistles, and built-in anti-vibration mounts. These are kind of my basic minimum intake fans. I have them hooked up to the built-in fan controller.

But before that, I would say to put something even stronger in the side port. By this I mean something like [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835608044"]Noctua[/URL] or [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835132023"]BGears[/URL].[URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835608044"]
[/URL]
You may think this will add a lot of noise. I would argue that it will be less offensive noise than your centrifugal sirens. Also, this (side) fan would not be running flat out, unless you wanted it to. Adding more power to the bottom intake couldn't hurt, either. At this point you would have so much air coming in that the case would be pressurized, and perhaps feed the GPUs more forcefully.

[QUOTE=kladner;394681]Looking at your case photos and reading your descriptions, I can say that one big factor is that I have more powerful case fans. I have both front fan slots filled with [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835553007"][B]Cougar[/B] [/URL]1200 rpm fans, which are relatively subdued but put out a lot. They have a lot of the aerodynamic bells and whistles, and built-in anti-vibration mounts. These are kind of my basic minimum intake fans. I have them hooked up to the built-in fan controller.

But before that, I would say to put something even stronger in the side port. By this I mean something like [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835608044"]Noctua[/URL] or [URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835132023"]BGears[/URL].[URL="http://www.newegg.com/Product/Product.aspx?Item=N82E16835608044"]
[/URL]
You may think this will add a lot of noise. I would argue that it will be less offensive noise than your centrifugal sirens. Also, this (side) fan would not be running flat out, unless you wanted it to. Adding more power to the bottom intake couldn't hurt, either. At this point you would have so much air coming in that the case would be pressurized, and perhaps feed the GPUs more forcefully.[/QUOTE]

The four case fans are [url=http://www.fractal-design.com/home/product/case-fans/silent-series-r2-140mm]Fractal Design Silent Series R2 140mm[/url], pushing up to 66 CFM, at under 19 dB. With three intakes, that's about 200 CFM. Come to think of it, I could get more air flow by removing the dust filters, which actually capture quite a bit.

The R4 case shields most of the centrifugal sirens' noise. I would say over half the subjective sound is the rushing of air in general. The most noticeable fan now is the power supply fan, which buzzes a little.

Okay can the title changes *please* stay in the Soap Box or otherwise near the bottom of the front page list? This is a bit ridiculous.