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Define R4 + SLI airflow questions - Page 2

post #11 of 16
As aesthetically unpleasing as it may be, I would try removing the slot covers and placing a 120mm fan on the outside of them blowingaway ffrom the case, thus pulling any stagnant air out and away.
   
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Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
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  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
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 #12 of 16
Have you raised your case up so bottom fans have good airflow?
A 120mm fan is 113 sq cm in area.
A 120mm cylinder 3cm long is 113sq cm in area
But 25% of that cylinder cannot draw air to fan because it is facing the PSU fan.
75% of 120mm cylinder 4cm long is 113 sq cm in area.

We could subtract 12-13 sq cm for the fan motor hub in middle but if we are going to be that technical we will need to add more sq cm to intake area to compensate for resistance caused by turning air 90 degrees to go into fan.. among many other things.

I use a caster base. Gives bottom clearance and makes it easy to move case too.
post #13 of 16
dbl post
post #14 of 16
Thread Starter 
Quote:
Originally Posted by doyll View Post

Have you raised your case up so bottom fans have good airflow?
A 120mm fan is 113 sq cm in area.
A 120mm cylinder 3cm long is 113sq cm in area
But 25% of that cylinder cannot draw air to fan because it is facing the PSU fan.
75% of 120mm cylinder 4cm long is 113 sq cm in area.

We could subtract 12-13 sq cm for the fan motor hub in middle but if we are going to be that technical we will need to add more sq cm to intake area to compensate for resistance caused by turning air 90 degrees to go into fan.. among many other things.

I use a caster base. Gives bottom clearance and makes it easy to move case too.
I have not, the case is just on the standard feet, which only gives it 1-2cm of clearance I think.
I'll prop the case up and see how that changes the results.
post #15 of 16
old thread but hopefully not to old to add to.

There is one option I see that you haven't even yet considered. The mid-level HDD bay you removed can be installed sideways (yes, it's a case feature). In the booklet it says this configuration can be used to funnel the top fan air towards the primary GPU.

I'm curious to how much of a difference it could make. You should try that :d
post #16 of 16
Thread Starter 
Thanks for the suggestion Rylt. I totally forgot that the drive cage could be rotated 90 degrees.
The thing is I have no need for the cage and prefer the clean look without it.
I've also since moved to a single GPU solution, so cooling is much less of a concern.
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