Higher TDP will give higher power consumption, clearly.
Intel don't publish the maxium power consumption, "Intel's TDP is a "round up" average of power measurements of processor intensive benchmarks." (from AnandTech)
However looking at the technical spec's for the processors they say that the max voltage for an i7 920 is 1.375V and current draw is 145A this give a max power draw of 200W and for the i7 750 it's 1.4V and 110A this gives 154W
I think that these would be virtually impossiable to achive though, which is why Intel publish the TDP which is a realistic value based on actual measurements.
