if comparing, have to consider both ambients and TDP of particular processor and settings.
At 1.3 vcore and 4.2 ghz, my i950 TDP with IBT load is 120W and 92amps (according to GB DES chip accessed by everest, which is fairly accurate) see first pic.
ambients, 27C IBT load 64C max in first couple minutes.
At 1.34 vcore and 4.4ghz, my i950 TDP is 184W and 136 amps, see second pic.
ambients 27C, IBT load 73C max in first couple minutes.
So increase from 4.2ghz 1.3 vcore to 4.4 ghz 1.34 vcore increased TDP by 64W and amps by 44, and increased load temps 9C.
OP may get another 2-3C with better block or another 2-3C with 2nd rad, and maybe 1-2C with better tim, but wont perform miracles at high TDP.