Pic 1 below shows the heatsink fan design of your EVGA GTX560Ti.
Notice 2 things:-
(i) 2 heatpipes run to the front while 1 heatpipe runs to the rear
(ii) the fins direction
These 2 imply that about 2/3 of the heat is being dumped inside the case, primarily through the front of the card. Note the red arrows.
Pic 2 below shows how this amount of heat moves once it is expelled out.
3 possible routes:-
(i) going up and possibly sucked by the CPU intake fan, through the CPU heatsink and then escape through the rear of the case. Obviously, this affect the CPU's cooling negatively. (Edit 1)
(ii) being pushed back into the opening by a strong front airflow (orange arrows in pic) generated by the 2 intake case fans. This produces higher GPU temp.
(iii) going down and then being sucked back into the card by the card's intake fan. This also produces higher GPU temp.
I suspect it is a combination of these 3 factors that cause a relatively high temp of your card. When the card is idle, hot air exhausted is small and does not matter much. When the card is under load, both the volume and temp of the hot exhausted air increase substantially.
OP, please excuse me for OT.
Edited by windfire - 5/11/11 at 5:38am