- May 18, 2010
"However, Petersen quickly pointed out an important detail about AMD's "free sync" demo: it was conducted on laptop systems. Laptops, he explained, have a different display architecture than desktops, with a more direct interface between the GPU and the LCD panel, generally based on standards like LVDS or eDP (embedded DisplayPort). Desktop monitors use other interfaces, like HDMI and DisplayPort, and typically have a scaler chip situated in the path between the GPU and the panel. As a result, a feature like variable refresh is nearly impossible to implement on a desktop monitor as things now stand.I think Koduri might have been misquoted. I read that he was asked why nVidia needed extra hardware and he said that he didn't know why, but it's possible that their GPU's don't support VBLANK.
That, Petersen explained, is why Nvidia decided to create its G-Sync module, which replaces the scaler ASIC with logic of Nvidia's own creation. To his knowledge, no scaler ASIC with variable refresh capability existsand if it did, he said, "we would know." Nvidia's intent in building the G-Sync module was to enable this capability and thus to nudge the industry in the right direction."