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My PC is overheating

post #1 of 9
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My case (a Lian Li PC-A70F) has two 140mm fans for intake, but only a single 120mm fan for exhaust. It is filled with dual GPUs and an 8320 FX, and they get a bit warmer than I would like under load. I know that I'm going to need to mod the case to add some more exhaust fans, but I'm wondering where the best place to put them would be.

Should I put an exhaust fan (or two, or three) at the top? Do I need a side panel exhaust (or intake) as well? I know this is an issue of simply not having enough ventilation, as the temperatures (CPU in particular) are significantly lower if I just take the side panel off.

Any ideas or tips for adding extra fans? I've included a couple pics so you have an idea of what I'm working with.

Stock case:


With components:
Lian Li
(21 items)
 
  
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AMD FX-8320 ASUS M5A99X EVO AM3+ AMD 990X XFX 7970 Double Dissipation XFX 7970 Double Dissipation 
RAMHard DriveHard DriveHard Drive
16gb G Skill Ripjaws SanDisk Extreme SDSSDX-240G-G25 Seagate ST375064 Seagate ST2000DM 
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SAMSUNG HD103SI Seagate ST3400633AS Lite-On Lightscribe DVD RW HR-02 Macho 
OSMonitorMonitorMonitor
Windows 7 ASUS VS239H-P ASUS VS239H-P ASUS VS239H-P 
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Das Keyboard S Thermaltake Toughpower XT 775W Lian Li PC-A70F Razer Mamba 
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Func Surface 
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Lian Li
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AMD FX-8320 ASUS M5A99X EVO AM3+ AMD 990X XFX 7970 Double Dissipation XFX 7970 Double Dissipation 
RAMHard DriveHard DriveHard Drive
16gb G Skill Ripjaws SanDisk Extreme SDSSDX-240G-G25 Seagate ST375064 Seagate ST2000DM 
Hard DriveHard DriveOptical DriveCooling
SAMSUNG HD103SI Seagate ST3400633AS Lite-On Lightscribe DVD RW HR-02 Macho 
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Windows 7 ASUS VS239H-P ASUS VS239H-P ASUS VS239H-P 
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Das Keyboard S Thermaltake Toughpower XT 775W Lian Li PC-A70F Razer Mamba 
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post #2 of 9
If you have a lowly 50 CFMs going through the case, that's changing all the air in the case 10-12 times per minute.

Your problem isn't how much air as much as it is where the air is blowing inside the case.

Try adding a fan inside the case blowing into the corner of the case where the video cards are mounted to get all the hot air out of that dead spot..
My System
(15 items)
 
  
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FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
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Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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My System
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FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
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Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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post #3 of 9
What are your temperatures? Ambient, CPU and GPU.

You have 2x water cooler on your 2x GPUs. What direction are they blowing?
post #4 of 9
cant really find the problem with the build... what exactly are your temps anyway? i can't see it being that bad with your build.

if anything i'd put another 120mm intake in the front 5.25 bays to supply more cool air to your macho, but your current build shouldn't be that bad.

ideally you want to put the top GPU rad on the 120mm exhaust port since it has no problems reaching. this way you cut half of the heat from inside the case. you don't need push/pull on that rad, very little is gained from push/pull anyway. a good push fan like a scythe GT should do the job.
post #5 of 9
I would try to mount the CLC's up top or somewhere else where they're not actively restricting airflow to such a huge amoun.
   
Z77 Bench-a-lot
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Z77 Bench-a-lot
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WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
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Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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post #6 of 9
I heard somewhere that GPUs use more watts than CPUs, and there are two of them in there. Now.....

You have cool air coming in from those two fans on the right that is being pushed to that radiator and its fans. That cool air gets turned into hot air anf moves back and up. What is back and up? Those hot video cards that are now running in a hot environment, which makes them run hotter, which makes the radiator radiate more hot air..........

That hot air then moves up to the vacuum created by the fan on the front of that white box, meaning that the CPU is running in a hot environment, making it run hotter.

Then that triple heated air finally gets expelled out the back.

I would suggest putting that radiator on top and exhaust that hot air out the top.
Blackie
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Blackie
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post #7 of 9
if you look at the pic's. the CLC wont reach the roof of the case. only the top CLC would reach the rear 120mm exhaust port. but the bottom CLC has to stay where it is since the tubes are too short to reach anywhere else. i suppose he can cut a hole on the floor of the case and mount the CLC as an intake (with filter) but not everyone wants to do that type of work on their case so i'll leave it to the OP on his decision.

yes typically GPU use 2 to 3 times as much power as CPU (if not more) for example. an ivybridge is a 77w chip while a GTX780 is a 250w card. so there is significantly higher thermal load on the GPU then the CPU. the OP is smart enough to realize this and has put the GPU on CLC while remaining air on CPU.(as opposed to everyone else who put CPU on CLC and leave the GPU on air biggrin.gif ) what he's doing is very smart
post #8 of 9
You can tell I've never watercooled anything. rolleyes.gif

Looking at this with a babies eyes, how about rotating the CLC 90 degrees and have them exhausting out the side panel, and then adding 1 or 2 intakes on the top or side to balance the flow?
Blackie
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Blackie
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post #9 of 9
Quote:
yes typically GPU use 2 to 3 times as much power as CPU (if not more) for example. an ivybridge is a 77w chip while a GTX780 is a 250w card

But then again, for example, 770's are volt locked at 1.2 (or 1.212) volts (i'm not sure what you have to do to bypass that) and dont hit 200w even on max oc for stock volts, while a haswell i7 with a good oc will be sat at like 150w, and 8-core piledriver at like double that, cpu's are more sensitive to temperatures too i'd guess, or maybe that's just my priority
Insert Name Here
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Insert Name Here
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