New
#1
Need advice on cooling graphics cards in SLI.
I just purchased another GTX670 2GB (2 fan ASUS) to go with the one that's been in my system (3 fan Gigabyte Windforce). Both cards do rather well thermally in the Valley benchmark with the Gigabyte reaching 59C and the ASUS 63C when they're in the box alone. Things become uncomfortably warm when I hook them up in SLI as they are extremely close together and there is little room for the Gigabyte (top card) fans to blow its air out. When in SLI the Gigabyte hits 77C and the ASUS 67C. The first time I ran it in this configuration the PC crashed during the benchmark. Afterward I increased the speed on the two front intake fans and it was able to complete the test multiple times.
I attached some photos of the rig and would like some suggestions on what I can do to cool the top card. I don't think putting the ASUS on top would work because it's the warmer of the two cards to begin with, has a metal fan shroud (which could short the back of the Gigabyte), and the longer Gigabyte needs the space up there.
Fan setup is as follows:
2 fans in the front sucking air in over the HDs. They are on a manual fan controller.
1 side fan blowing air in between the power supply and the graphics cards, also on a manual fan controller (should it be blowing out?)
1 fan blowing air through the CPU heatsink (CPU_FAN control)
1 case fan blowing air out of the case on the other side of the CPU heatsink
1 case fan blowing air up and out of the tower (2 position speed switch)
1 bottom mounted power supply blowing air out of the back of the tower