Help needed to send modulated signal to usrp continuously with a higher IQ rate than 200kS/s

[johndoe00770077]

Hi I am using Two USRPs (2944R) to send a continuous signal. While implementing my design using 2 outputs on one USRP I could get a maximum IQ rate of 500k, however when I add another USRP to the mix (meaning two USRPs 4 outputs) I can't get the IQ rate to be higher than 200k. I wanted to know if the method I have used is ideal or is there a better method to implement this?

Currently what I do is Load the I and Q files for my model, this is then inputted into a mathscript node which generates the signal for it.

If there is a better way to do this i would greatly appreciate any input on how I can make this better. USRP Synchronisation