Very interesting!Yes, that seems to be true. Out of curiosity, I popped open some of my HDMI to VGA converters to see what was inside. The overachieving Gembird converter is the one in the first photo and, as expected, it does not use CH7101 chipset as advertised. Does anybody know what this "LK7112" chip is? I couldn't find any info with some cursory Googling, but it is really good. It's better than both my Delock 62967 and Startech DP2VGAHD20 - as mentioned before it will go to 395 mhz before green pixels start to appear.
The second pic is from a Walmart brand HDMI converter that I've had for a while. This one really does use the CH7101, and performs about as well as Petrasescu_Lucian's unit. It tops out a little under 270 mhz and the most it can reliably display is 1920x1440 at 60hz.
2048x1536 at 86hz is the max resolution/refresh rate for the 2070SB as specified in the user manual. That's why I typically use it as a benchmark. In practice, though, I run it at 1440x1080 most of the time so everything on the desktop is the same size as my computer's main LCD.
Can you contact Gembird about this? It would be great if they could replace all their hdmi->vga converters with this LK7112 chip!