t1slotDid the opposite (2 to 3 slot) , and was not that hard. I removed my fan120aio, the struts on both sides and the psu & cables (had to reorganize to prepare for the 6800XT with 2x8pin,To verify the controller confuration, use the show controllers command : Router# show controllers t1 030 brief T1 030 is up. Applique type is A900-IMA16D Cablelength is long