Topic: 6990 temperature 100 (Read 6416 times)

I tryed this fan along with its 2 slot cousin and found them worthless. They just dont move enough air and they block airflow already used by the on board cooler. I did end up removing all the case fans from my dual 6990 miner and placing a normal house box fan facing in on top of it, cooling solved. Hottest core 80 oC in a 84 oF room. I will likely explore all passive cooling of this nature soon.

You needa get one of those PCI express extender cables + get air blowing on the cards. Mine are in a closed case with a fan blowing air onto the top of the cards, and one blowing air from inside the case towards the back of the case across the cards. There is a few inches between them, and they top out at 90 Celsius for a few hours on a hot day, core clock OC'd to 940. Each GPU is generally 70 to 75.

I also have some of those PCI slot coolers that suck air and blow it out of the case spaced under each card. The amount of HOT air blowing out of the back of this case is like 10 blow driers. I try to keep it pointed out the sliding glass door when I'm home. I'll have a good heater when winter comes along again though. It sucks 11 amps from the wall socket in full operation too.

Edit:

This is the PCI slot cooler I'm talking about.
http://amzn.to/jcJdZS

I had a big discussion with Sapphire support about this same issue, they told me as long as the card is under 102 oC and I am not having any performance issues, all is well. In my case one of my 6990's currently is at 79.5 and 83.5 oC and the other in the same box are both at 93.5  oC. There was a wide range between the two cores on the hot card but they match each others temp after I replaced the thermal grease.

Was thinking more along the lines of 5870s but whatever floats your boat.

Spontaneous combustion of most solid materials doesn't occur until at least 500-600 degrees celcius.

yepp, thinking about a barbie doll....

Send the 6990s back and get something else.  They're unbelievably loud. 

thx, yes i think the main problem that there is only a little space between the cards...but if i was mining with 1 card the temp was still too high....i can only reduce the temp, if i send "more air through the card". sorry for my english, it is a little complicated write down, what i want to say...

i cannot downclcok the memory. i tried with aticonfig --od-setclocks, but i cannot. i read somewhere, i have to flash the bios of the card. but i will lost so the warranty...

thx,

gedeon

Downclock the memory to as low as you can go without crashing, it should lower the temps a bit. Also if the 2 cards have very little room in between each other use something to space them out, not sure if you know what I mean. Some pics of rigs using pieces of plastic or w/e just to give them that extra centimeter of space help quite alot.

Have a look at my 6990 guide for Phoenix

Also if i go below 550 memory, my card screws up and you have to reinstall the driver

hola,

i set the ventillators on 100 %. now it is louder as my girlfriend's hairdryer, but adapter 1 is on 73C adapter 2 is on 68C. i thinking about watercooling....

could you tell me some advice, with wich triggers should i use poclbm?

thx,

gedeon

i tried with one card only. the same. now the airflow should be ok. maybe the triggers?  --plattform 1 -d0 -v -f10

any suggestion?

thx

gedeon

100c lol. Just run it stock unless you want to ruin your card before it mines any coins

a Couple of photos of the rig would go a long way in letting the forum uses give improvement suggestions.

There are Differnt Video cards that use Airflow Differntly

its better to use those LONG video cards, that Pull Air from the END

and not the Graphics cards that Pull air from the "Bottom" of it

you CAN put a FAN on the Side case to cool it down i guess

just get a BAD ass 60 to 80 cfm airflow fan or something

there should be like a 75 or 85 airflow on newegg

not sure what the size of it is, but if your side panel has holes/slots for 2 fans, top and bottom, and the fan is extra big, just turn it sideways and use 2 or 3 case screws instead

thx all,

i think the main problem, that there is not so much space between the cards....there is no block at the end of the cards, i have an ssd hdd, and ventillators from the front and side takeing the fresh air in.

i am not overdriveing my cards, i am under factory settings, 600/1250 (gpu/mem) to wich value should i go down? i would be very happy if my cards would be around 75C. i see only one solution, i think, to take out a card, and try it so.

gedeon

100c is too high for my tastes. I try to keep my cards within the 65-75c range max.

 Things to make sure :
1) the airflow out of the BACK of the card is sufficient : Make sure there is nothing impeding the air flow that comes out of the back of the card where the monitor(s) plug in. Most cards have the exhaust vent on this part of the card, if you have your computer backed up against a wall try moving it so that air can move freely our of the back.
2 ) Intake air should not be recycled from the exhaust : Make sure that the air that is flowing into the card is fresh cool room air. If you have a 7k or 10k rpm hard drive that is in the direct air flow from the front of your case to the video card, you may consider moving that drive(s).  If you can get a large 120 mm (or larger fan) that acts as the intake to directly hit the video card with out other components getting in the way this is the best solution.
3) Check your software flags and overclocking : If you are getting to hot (85c+) lower your overclocking until you can get it reasonable. Change the flags you have on your software lower some settings and play with it until you can get the temperatures down.

  In the end you don't want to be running a card to hot. You will prematurely cook the card and that will cost you possibly more in the long run that just lowering your settings a little bit. IMO.

See if you can go down to 300, though I hear from some people 6xxx series isnt stable that low, but its worth a try.

still working, now stable 82 at 600mhz, to wich value should i downclock the memory?

I wonder if 100C is enough to ignite dust laying on the heatsink?