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AMD 7990

The 7990 not only exhasuts heat from the rear of the card to outside the case but also from the sides of the card to inside the case. If you are running an air cooled CPU also to quite an overclock you'll need excellent case airflow. I found a negative pressure worked best on mine. Then I got an H100i to cool the CPU. I have a big case and modded an extra fan into the window next to the card so it puts cool air directly at the fans.

At the top of this page you overclocking the 7990 too and running benchmarks? It's gonna get hot and it's a hot card. Havent gone right through the thread but what case you using?

It will run hot with 2x7970Ghz GPU's on the same board. especially benchmarking. Even gaming mine will run close to 90 degrees in the summer. Remeber to include the ambient temperature of the room your PC is in. It's warmer this week.

The 7990 is a warm card. You need to undervolt to drop the temps. If you bought it to run cool then the 7990 was never a cool card as all the reviews say.
 
Mal X said:
i'm not happy with the 7990 !!!! there's a pool of very hot air around the first fan, (the closest fan to the rear panel)...... it's running at 97 degrees in Heaven

all i've done is to up the overclock from 4.5 to 4.6

the exit fan isn't removing this pool of heat, it's blasting out to the side level with the back plate...........the 7970 was nothing like this :mad:

i think 4.6 is effecting it too much
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Can we have some photos of your system to see positioning and see were you have fans on your case and weather they are intakes or exhausts fans ?
 
i aimed a 90 cfm fan at it and it didn't drop the temperature at all, not even by one degree and the fan was running at 2000 rpm

the pc has a 140mm intake and below that two 120 mm so that's 3 fans in the front panel, nothing blocking them,:eek: it has a 120mm exhaust and a 90mm under the card on the rear panel...........but the case fans are running quite slow, they dont speed up as the GPU does...... they're linked to the CPU

But these 3 intakes are only Corsairs
 
Mal X said:
i aimed a 90 cfm fan at it and it didn't drop the temperature at all, not even by one degree and the fan was running at 2000 rpm

the pc has a 140mm intake and below that two 120 mm so that's 3 fans in the front panel, nothing blocking them,:eek: it has a 120mm exhaust and a 90mm under the card on the rear panel...........but the case fans are running quite slow, they dont speed up as the GPU does...... they're linked to the CPU

But these 3 intakes are only Corsairs
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You are probably running positive pressure as you have more air coming in than going out if you calculated the cfm for each fan and rpm. Running the fan at. I'd turn the added fan around so it becomes an exhaust. I take it the CPU is air cooled.

So you have no fans in the roof of the case? I'd mod 2 120mm's into that if it were me.

I have a Silverstone Temjin TJ10 which is quite a large case. I have 2 in and 3 out case fans plus what the card exhausts. My PSU daws from the bottom and exits the back so heat is never shared in the case bar some latent PSU case heat.

My intake fans are relatively low in the case drawing the cooler air at floor level in the front one from either side of the case both these point at the card. The two fans in the roof are for the H100i CPU cooler but draws air from the case. I changed the stock fans for gentle typhoons and the rear case fan is in the top half of the rear of the case again exhausting. Hot air rises so roof fans make sense.

Change your exhaust fans to be controlled by something else. If you are benching have them high rpm especially if they are slow. Create a negative pressure case with more exhaust than intake.

To me the problem isn't with teh 7990 it's with the airflow in your case. Check where you CPU air and PSU air goes also. Or leave the side off your case and have all fans exhaust.
 
Mal X said:
i'm not happy with the 7990 !!!! there's a pool of very hot air around the first fan, (the closest fan to the rear panel)...... it's running at 97 degrees in Heaven

all i've done is to up the overclock from 4.5 to 4.6

the exit fan isn't removing this pool of heat, it's blasting out to the side level with the back plate...........the 7970 was nothing like this :mad:

i think 4.6 is effecting it too much
Click to expand...

I have suffered with the 1st gpu and the only "fix" I could suggest is using a stick to prop up the end of the card. With mine, the card was flexing under it's own weight/length and it was breaking the connection between the heatsink and gpu.

When propping up the card, you don't need to lift it up much, it shouldn't feel forced up, because then you are likely just flexing the card the other way. It should have little resistance and would only need to rise a few millimetres I would say.

It's not ideal and not particularly a fix either. Whilst it did help me with my temps, it doesn't sit right with me that this is how I have had to continue to use my card without it hitting that dreaded 102 degree's limit. I also lowered the voltage to the lowest point, where it continued to be stable.

Here is a an example of what I was facing before the "fix"

Here is an example of the result of the "fix"

As you see, whilst not perfect by any means. It made things manageable, but again despite the fact the card itself is a bit of a beast, I am overall very unsatisfied with the purchase and am awaiting something killer so I can replace the bleeding thing. The card certainly has a lot of potential (especially when I bought it over a year ago, but it's definitely more trouble than it's worth).

*EDIT* To note, before the fix, I tried multiple things, I changed the thermal compound several times, but it didn't make any noticeable difference what so ever, however I did notice thins were bent toward the centre of the card which hinted towards the card flexing causing problems. The thins being bent are not an issue in their own right, but were a very clear visual sign of the card flexing beyond it's means.
 
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i switched from a very large lian li pc A 10 to a much smaller Cooler Master Silenco , the mobo inside the lian looks tiny, the lian has a much larger internal volume, plus has twin 140mm Viper Apache venum intakes

the psu in the lian was underneath in a separate compartment, the silenco definitely looks too small inside

anything else ?............. it's at 4.6 now, it was at 4.5

i might switch back to the lian

the cpu is at 28 to 30 degrees right now on idle.....gpu about 30 to 40
 
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Th0nt said:
According to some posts lately matt you absolutely do not need all that wattage, especially on single GPU. ;)



I returned my one too, one core used to run 10c+ hotter than the other and had big coil whine -was great for mining though. The XFX 750w black edition was the weak link having to send that back later, the modular connections were not that good.
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Did the RMA go through?

Mine has similar issues but not sure if I want to go through the process.
 
Woodsta888 said:
The 7990 is a warm card. You need to undervolt to drop the temps. If you bought it to run cool then the 7990 was never a cool card as all the reviews say.
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Yeah the review samples all ran cool and quiet, the retail boards are the exact opposite, hot and loud :(
 
i've improved it quite a lot

voltage = 1095
core clock = 971
mem = 1480

in normal heaven it's about 75 degrees but in Heaven Benchmark it gets to about 93 degrees, i tried a lower voltage than 1095 but it didn't like it.

so it's deffo cooler than before but not by much

i put a 90 cfm fan 2300 rpm all around it, i tried every angle and it made no difference at all and that fan is really powerful..... so there's no way that i can improve its cooling with fans.
 
the heat from this card is excessive, no thermal paste/super fast fan will solve this.

but luckily the rig looks far better/ runs cooler with the side panel off, i love looking inside.......... i'm thinking of a custom work bench or an ``open pc``
 
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whilst gaming the fans are racing on and off all the time, especially when you suddenly go into the menu, it woooooshes stops woooooshes stops, it's getting a bit annoying, plus a bit disturbing ...........this is only Sniper Elite 3.

the 295 X2 is beginning to make sense
 
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Mal X said:
whilst gaming the fans are racing on and off all the time, especially when you suddenly go into the menu, it woooooshes stops woooooshes stops, it's getting a bit annoying...........this is only Sniper Elite 3.

the 295 X2 is beginning to make sense
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Not at the current prices it doesn't.

Set a custom fan profile.
 
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