This model is directly analagous to this Tesnsorflow's LM. In fact, the reader is directly taken from its older version
See this blogpost.
python ptb-lm.py --data=[PATH_TO_DATA]
Default params should result in Test perplexity of ~78.04. Your actual result will vary due to random initialization. This basically matches results from TF's tutorial, only faster.
On GTX 1080 I am getting around 7,400 wps.