Overclock.net › Forums › Graphics Cards › AMD/ATI › Help with 7950 crossfire temps
New Posts  All Forums:Forum Nav:

Help with 7950 crossfire temps

post #1 of 6
Thread Starter 
My sig rig should be showing but here's my issue. I've got two Sapphire 7950 Boost edition GPU's in crossfire at 1100/1575 stable, but the temps while in game are getting a bit high. I use afterburner to set the speeds at 85 but even after playing bioshock infinite for almost 30 minutes the top card has already hit 68C while the bottom card sits at high 50's. I know that the top card will be hotter but i don't want it getting that hot especially after only 30 minutes of playing.

I also have not touched any voltage's, the overclocks are both on stock voltage.

They idle at 28C top and 26C bottom, but when i'm not gaming i don't have them overclock at all and fan speed is on auto.

I've got a HAF 932 Advanced case and i'd rather not water cool the cards, so i'm looking for suggestions on bringing the temperature down. One of my thoughts was to replace the side fan with 4 of these cooler master R4's and use them as intake on the side but i'm not sure if that would bring the temperature down or not?

Any help would be much appreciated, i'm just worried that with extended gaming periods that top card is going to get even hotter frown.gif
post #2 of 6
68C isn't that bad. Reference coolers hit around 64C without crossfire and without an OC, so you are doing fine. Some cards are a bit cooler than others even of the exact same type. You can figure out if one card has a cooling defect by swapping them. If the top card is still the hottest by the same amount, then it is a location issue and not a card issue. The top card is pulling air from around the bottom card's PCB, so it is going to run hotter.

If you determine that it is a location issue then you can start trying to alleviate the problem by blowing a case fan towards the cards to increase circulation. If the bottom card has a backplate, then you could take that off to get more room between the cards.

Of course, watercooling would bring them both down to the 30's under load smile.gif
 
Current PC - 550D
(27 items)
 
CPUMotherboardGraphicsRAM
Intel 3570k Asrock Z77E Gigabyte 7970 G Skill RipJaws X 
Hard DriveHard DriveCoolingCooling
Seagate Green Intel 320 SSD XSPC Raystorm Koolance 7970 Waterblock 
CoolingCoolingCoolingCooling
XSPC 1650RPM Fan Alphacool XT45 Laing DDC Bitspower 80mm Reservoir 
CoolingCoolingCoolingCooling
3/8" Copper Tubing Push-to-fit Connectors Bitspower Fittings Tygon Black Tubing 
OSMonitorMonitorKeyboard
Windows 8 Pro Viewsonic VP2770 LED Catleap Coolermaster Storm 
PowerCaseMouseOther
Seasonic 660XP2 Case Labs S3 Logitech G500 MDPC-X Sleeving 
OtherOther
Lamptron FC5 Bitspower Temperature Probes 
CPUMotherboardGraphicsGraphics
Intel 4820k Asus Rampage Gene IV MSI GTX 970 Gaming MSI GTX 970 Gaming 
RAMHard DriveHard DriveCooling
Mushkin Radioactive Intel 320 Seagate Green Laing DDC Pump 
CoolingCoolingCoolingCooling
XSPC Acrylic DDC Top 2x Alphacool XT45 240mm XSPC Fans Bitspower Silver Comp Fittings 
CoolingCoolingCoolingCooling
Tygon Black Tubing Bitspower Reservoir XSPC Raystorm EK FC-Titan Waterblock 
OSMonitorMonitorKeyboard
Windows 7 64 bit Viewsonic VP2770-LED Yamakasi Catleap  Coolermaster Storm Mechanical 
PowerCaseMouseMouse Pad
Seasonic 660W Platinum Corsair 550D Logitech G400 None 
AudioAudioAudio
Pioneer Premier Receiver Paradigm Atoms Polk Subwoofer 
  hide details  
Reply
 
Current PC - 550D
(27 items)
 
CPUMotherboardGraphicsRAM
Intel 3570k Asrock Z77E Gigabyte 7970 G Skill RipJaws X 
Hard DriveHard DriveCoolingCooling
Seagate Green Intel 320 SSD XSPC Raystorm Koolance 7970 Waterblock 
CoolingCoolingCoolingCooling
XSPC 1650RPM Fan Alphacool XT45 Laing DDC Bitspower 80mm Reservoir 
CoolingCoolingCoolingCooling
3/8" Copper Tubing Push-to-fit Connectors Bitspower Fittings Tygon Black Tubing 
OSMonitorMonitorKeyboard
Windows 8 Pro Viewsonic VP2770 LED Catleap Coolermaster Storm 
PowerCaseMouseOther
Seasonic 660XP2 Case Labs S3 Logitech G500 MDPC-X Sleeving 
OtherOther
Lamptron FC5 Bitspower Temperature Probes 
CPUMotherboardGraphicsGraphics
Intel 4820k Asus Rampage Gene IV MSI GTX 970 Gaming MSI GTX 970 Gaming 
RAMHard DriveHard DriveCooling
Mushkin Radioactive Intel 320 Seagate Green Laing DDC Pump 
CoolingCoolingCoolingCooling
XSPC Acrylic DDC Top 2x Alphacool XT45 240mm XSPC Fans Bitspower Silver Comp Fittings 
CoolingCoolingCoolingCooling
Tygon Black Tubing Bitspower Reservoir XSPC Raystorm EK FC-Titan Waterblock 
OSMonitorMonitorKeyboard
Windows 7 64 bit Viewsonic VP2770-LED Yamakasi Catleap  Coolermaster Storm Mechanical 
PowerCaseMouseMouse Pad
Seasonic 660W Platinum Corsair 550D Logitech G400 None 
AudioAudioAudio
Pioneer Premier Receiver Paradigm Atoms Polk Subwoofer 
  hide details  
Reply
post #3 of 6
Thread Starter 
Quote:
Originally Posted by subyman View Post

68C isn't that bad. Reference coolers hit around 64C without crossfire and without an OC, so you are doing fine. Some cards are a bit cooler than others even of the exact same type. You can figure out if one card has a cooling defect by swapping them. If the top card is still the hottest by the same amount, then it is a location issue and not a card issue. The top card is pulling air from around the bottom card's PCB, so it is going to run hotter.

If you determine that it is a location issue then you can start trying to alleviate the problem by blowing a case fan towards the cards to increase circulation. If the bottom card has a backplate, then you could take that off to get more room between the cards.

Thanks for the quick response. I'm fairly certain the temperature is higher because of crossfire because before i crossfired them the top card (original card) wouldn't get that hot but once i got the second card the temperatures started to go up. I've already got a fan mounted on the bottom to blow air onto the cards, i just feel like this big fan on the side isn't moving much air lol.
post #4 of 6
Have you tried switching them around?

Sometimes the TIM application and cooler seating can be different between the 2 identical cards. The bottom card might actually cool better if it's at 58*c when you're playing.

When I play BioShock, my 7950s get up to 75*c / 74*c (top / bottom). Pretty much even between the two.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by F4ze0ne View Post

Have you tried switching them around?

Sometimes the TIM application and cooler seating can be different between the 2 identical cards. The bottom card might actually cool better if it's at 58*c when you're playing.

When I play BioShock, my 7950s get up to 75*c / 74*c (top / bottom). Pretty much even between the two.

Nope never considered switching them around. I know the bottom is cooler since its got a cooler right under it blowing cool air onto it. I may have to open things up and see if i can move things around smile.gif
post #6 of 6
I don't have 7950's in Crossfire, but rather two 7970 GHz Editions. When Crossfired, the top cards temperature reaches roughly 10 to 12°C more than being just used in a single-card setup. The fans are spinning faster too. Just to give you a comparison:
My top XFX card gets roughly 78-80°C hot during a long Bioshock Infinite session, the lower card tops out at 69°C. Fanspeeds would be 65-70% for the top, and a roughly 50% for the bottom. In Crossfire one card usually always gets hotter than the other, especially with most custom designed coolers like your or my cards are using. The reason is simple - the bottom card spreads its hot air right into the case, while the top card sucks in the already heated air to cool the GPU down. While the bottom card actually gets some sort of cool air, the top one has almost no chance to bypass the heat emitted by its lower brother.

There are a couple of ways to help this:
- Undervolt the cards
- Try to improve the airflow, fans blowing on top of the cards as well as in between them from their ends help. Two top fans for exhaust help too.
- If possible, give them space to "breathe", one slot-bracket between the cards is IMO the minimum for custom coolers, two slot-brackets would be better
- Replacing the TIM is not a bad idea in most cases, mind your warrenty though!
- Test both cards installed in single-mode. If one appears to be hotter than the other, use that hotshot as the bottom card.

In the end a temperature in the high 60°C ain't bad at all for a Crossfire setup on air! Even though you set 85% fanspeed. You simply won't get them to run at single temperatures, unless you watercool. Maybe if you take off the cases sidepanel...
Sapsan
(14 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8150 @stock Asus Sabertooth 990FX XFX Radeon 7970 GHz Edition DD XFX Radeon 7970 GHz Edition DD 
RAMRAMCoolingCooling
Corsair XMS3 4GB 1600MHz Corsair XMS3 4GB 1600MHz Corsair H100i Noiseblocker eLoop 1300rpm 
CoolingCoolingOSMonitor
2x Enermax Cluster PWM 2x Enermax TB Silence PWM Windows 8 64bit HP LP2475w 
PowerCase
Corsair HX1000W Antec P280 
  hide details  
Reply
Sapsan
(14 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8150 @stock Asus Sabertooth 990FX XFX Radeon 7970 GHz Edition DD XFX Radeon 7970 GHz Edition DD 
RAMRAMCoolingCooling
Corsair XMS3 4GB 1600MHz Corsair XMS3 4GB 1600MHz Corsair H100i Noiseblocker eLoop 1300rpm 
CoolingCoolingOSMonitor
2x Enermax Cluster PWM 2x Enermax TB Silence PWM Windows 8 64bit HP LP2475w 
PowerCase
Corsair HX1000W Antec P280 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD/ATI
Overclock.net › Forums › Graphics Cards › AMD/ATI › Help with 7950 crossfire temps