The Results

With the fan placed between the radiator fins and the heatsink base
showing the delta between GPU temp. and ambient temp.

Normal : 412MHz core and 375MHz RAM @ 1.6V
OV+OC : 460MHz core and 340MHz RAM @ 2.0V

As you can see from the chart above, the results were very impressive! Let's start with the GPU running at the stock voltage of 1.6V and clock speeds of 412MHz core and 375MHz RAM; and the fan placed in the middle position.

When mounted with TT-8025T, the SI-97 cooler managed to cool the GPU about 11.2°C better than the Jetart JACSH1! However, the fan was very noisy.

When mounted with the ACR BF5620, the GPU was 6.4°C cooler with the SI-97 cooler than with the Jetart JACSH1.

Overvolting greatly increases the amount of heat your graphics card produces. But even at 2.0V (460MHz core/340MHz RAM), the SI-97 with the TT-8025 fan managed to keep my card 5.6°C cooler than Jetart JACSH1. In fact, the SI-97 with TT-8025T was still able to keep the GPU cooler than when it was paired with the ACR BF5620 at stock voltage and lower clock speeds!

With the fan placed on top of the radiator fins
showing the delta between GPU temp. and ambient temp.

Normal : 412MHz core and 375MHz RAM @ 1.6V
OV+OC : 470MHz core and 340MHz RAM @ 2.0V

When I changed the position of the fans from the middle to the top of the radiator fins, I was able to squeeze an extra 10MHz out of the GPU!

At stock voltage and clock speeds, the SI-97 equipped with TT-8025 managed to keep the core 13.92°C cooler than the Jetart JACSH1! Even when the card was overvolted and overclocked further, the SI-97 and TT-8025 combination managed to keep the core 8.64°C cooler than Jetart JACSH1.

From what I can see, switching the fan from the middle position to the top position will reduce the GPU temperature by around 3°C.

Comparing the temperature results of SI-97 with the Jetart JACSH1 should give you a rough idea on how well this modded cooler performs against common GPU coolers like the Zalman ZM80D-HP, since the JACSH1's performance is very close to that of the ZM80D-HP.

For more information, read our reviews of the Jetart JACSH1 and Zalman ZM80D-HP.