Heat must be horrendous between those cards no?
I space my cards on 3 levels, they are spaced well apart.
GPU | Temp | Fan | GPU Clock | Power
0 | 60 'C | 80 | 1999 MHz | 154.35 W
1 | 61 'C | 80 | 2012 MHz | 133.77 W
2 | 48 'C | 80 | 2037 MHz | 153.98 W
3 | 47 'C | 80 | 1961 MHz | 127.53 W
4 | 55 'C | 80 | 1936 MHz | 120.60 W
5 | 47 'C | 80 | 1987 MHz | 157.31 W
6 | 60 'C | 80 | 1961 MHz | 140.76 W
7 | 54 'C | 80 | 1923 MHz | 133.96 W
8 | 53 'C | 80 | 1987 MHz | 167.75 W
9 | 51 'C | 80 | 2025 MHz | 131.68 W
10 | 59 'C | 80 | 2025 MHz | 143.68 W
11 | 57 'C | 80 | 1949 MHz | 157.05 W