Historic video game modification, Portal: Prelude, crafted by Nicolas "Nyk018" Grevet, has been given a significant modern-day upgrade 15 years post its original inception. The remastered edition contains full path tracing, DLSS 3, and Nvidia Reflex capabilities. Furthermore, it became the pioneer game to implement the revolutionizing RTX IO – a framework designed to accelerate texture loading times and shrink file sizes significantly.

It is worthy of mention that these modern enhancements are not simply patches to the original mod but are a dramatic leap technologically and visually. The full path tracing introduces vastly improved lighting and shadow effects into the game. Besides that, DLSS 3 takes deep learning super-sampling technology to a new level with better framerate optimization, thus ensuring smooth gameplay.

But where Nvidia's Reflex enters the mix is where this gets really groundbreaking–a tool aimed at decreasing latency for competitive gamers. It measures system latency – essentially how long it takes for your mouse movements to reflect on your screen – providing players with the edge they need in fast-paced play environments.

The ground-breaking RTX IO is, without any doubt, one of the most crucial highlights of this remaster, making Portal: Prelude the first game(mod) ever to gain support from this innovation. Launched by Nvidia for GPUs featuring RTX branding, this technology aims to hugely revamp texture load times and drastically cut down on file sizes ensuring rapid responsiveness for games.

In conclusion, starting today, avid gamers can experience these enhancements by downloading Portal: Prelude RTX on Steam. The minimum requirement for experiencing these updates on max quality would require at least an RTX 2060 branded GPU unit; however, stronger hardware might be needed for tapping into path tracing to its full potential. This revamp serves as a testament to the continual evolution in gaming technology, constantly pushing boundaries for a more immersive gameplay experience.