It's still not something that should be generally recommended.
Hey, whatever floats your boat. I don't fall on the conservative side when it comes to OC recommendations. I'd hesitate to do it on a file server with multiple HDDs/SSDs, but for a home machine, it's actually quite safe and stable. 105 mhz bclk is really nothing. USB devices can be pushed wayyyyyyy out of spec and work okay, and in my experience, PCIe cards behave very well up until a bclk of 119-120 mhz.
SATA is a slightly different issue, though I have had no stability/corruption issues using HDDs on standard SATA connectors at a bclk up to 110 or so mhz. Granted, that's on FM2+, but the intrinsic issues are the same.
Intel systems crap out at bclk speeds well below where you're going to start getting problems with subsystems tied to the bclk.
Want to overclock? Just get a K. If you can already afford a 4790S, you can squeeze a 4790K in if you're going to OC, and get better stock performance too.
Some people just have an S for whatever reason. So if they wanna know how to OC one, there's two ways to go about it, both of which work together:
Set the CPU to max turbo frequency, and
raise bclk to 105 mhz.
Besides, doesn't overclocking kind of defeat the purpose of the CPUs 65W TDP?
Maybe. That's up to the end-user to decide. More speed = more watts.