1. T-Rad2 is said to support SLI and Cross Fire mode. What about for 3 SLI or even for 4 Cross Fire?
   
   

2. T-Rad2 has a surface area greater than any other average GPU heatsink and has more fins but can it be run passively without any fans?
   
   
3. A serious problem with VGA coolers that have the option to install two fans is the SLI bridge. With two fans, it is just virtually impossible to install the SLI bridge. Does T-Rad2 have this same problem?
   
   
4. Can you please tell me what's going on if one VGA card appears to be hotter than the other VGA card, when I am in SLI mode with T-rad2 installed on both VGA card? Is it normal? Or I might have installed the heatsink incorrectly.
   

Installing T-Rad2 with fan will take up 3 PCI slots (assuming the height of fan is 25mm). Currently there are no motherboards that provide such extravagant spacing for T-Rad2 to work in such configuration setup. Simply put, a typical ATI HD 3870 with its stock cooler will take up two PCI slots. Replace stock cooler with T-Rad2, three slots will be taken.

Even though in our lab tests running the 3D Mark, the T-Rad2 is found to be better than stock cooling at 81 Celsius degrees without any fans, we still recommend installation of a fan unless you have a side panel case fan. As each environment is unique with various factors to account for, a CPU fan is still the best option to go for.

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Rest assured that T-Rad2 was specifically designed around the needs of the enthusiasts. Trouble installing the SLI bridge is usually when the heatsink is built over the size limit of SLI and CF thus hindering the installation of SLI bridge. T-Rad2 does not have this problem and is well inside the size limitation. You can install all types of SLI bridge without any difficulties.

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Can you please tell me what's going on if one VGA card appears to be hotter than the other VGA card, when I am in SLI mode with T-rad2 installed on both VGA card? Is it normal? Or I might have installed the heatsink incorrectly.

When running under SLI or CF mode for your VGA card, even with Stock cooler, it would have different temperature readings, this is due to different ratio of GPU usage, usually the first VGA card will have more GPU usage, this problem will show greater difference when running in SLI mode, the other problem would be the air intake area, which the first VGA card's air intake will be blocked by the second VGA card, so the temperature rises over time, please see below for the picture taken in our lab testing, GTX280 in SLI mode on Intel X58 motherboards, here we can see that the distance between the first VGA and the second VGA are of 3 PCI slots away from each other, and the temperature difference are around 10 degrees celcius.

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