I did some testing of 4.4 HT On vs 4.5 HT Off in wPrime 1024M and Vantage CPU test to confirm my findings which I saw when running Vantage with HT On vs HT Off. Here are the results which show a big difference favoring the lower clock speed with HT ON.

4523Mhz HT OFF wPrime 1024M



4438Mhz HT ON wPrime 1024M



4523Mhz HT OFF Vantage




4438Mhz HT ON Vantage