It’s been a confounding few years for PC gaming enthusiasts. Graphics cards have bloated in size as power and performance surged, with triple-slot-plus monstrosities virtually the norm in the mid-range and above. But itty-bitty small form factor PCs have been enjoying a renaissance of their own — and they’re not always able to fit today’s behemoth GPUs. Nvidia’s new “SFF-Ready Enthusiast GeForce Card” guideline, announced during Nvidia’s Computex livestream, hopes to eliminate consumer confusion when the two trends collide. It’s a pretty straightforward certification plan. Nvidia’s guideline i…