These 65W products have reached some end-users and in Asia the overclock results aren't bad at all. A Core i7-5775C on an ASRock Z97 OC Formula reached 5.00 GHz clock speeds on air-cooling, that is at a core voltage of 1.419V though. The PC wasn't stable enough for benchmarking but did boot into Windows 7 and finished a CPU-Z screenshot.
The Core i7-5775C has a default core clock of 3.3 GHz and 3.7 GHz turbo frequency. The chip is a quad core model with hyper threading enabled and features 6 MB of L3 cache. Overclocked at a 4.8 GHz the system was stable and able to finish a 32M wPrime run in 4.399 seconds. Have a peek at some of the screenshots below, courtesy of Hong Kong-based HKEPC.