I have done some undervolting and overclocking to see what happens with temp and hashrate.
core i7 920 @ 3.0 GHz, 6 GB RAM @ 1600 MHz
GTX 580, 3 GB 384 bit, Core: 844, Mem: 2055, Shader: 1688
-i 0 -H 1 -C 1 -l F16x16
307.11 khash/s | 74 °C
Would it be helpfull if I try to compile CudaMiner myself for Fermi Kernel?
compare with 2013-12-10 release for reference..
things that changed:
cuda 5.5 instead of 5.0
compiled with -arch sm_20 and maxrregcount 63 instead sm_10 and maxrregcount 124
not sure yet what caused the extra heat. Maybe the default -H 2 option instead of -H 1 previously