The HT link speed is a measure of theoretical bandwidth
At 32-bit HT2 is something like 11GB/s and HT3 is 22GB/s. HT2 will not hold you back much, if anything. The only way you will come 'close' is if you crank the IMC/NB to 2500MHz with the HT2 at 1000MHz.
A PhII 945 at 14x250MHz --- 2500MHz IMC/NB:
At stock it is 9-10GB/s and 'normal' OC 11-12GB/s. 13.79GB/s was a lucky shot -- not very typical even with an OC.