A GPU upgrade is more than a faster card
Display goals, physical clearance, power and software checks in one place.
Start from the result you want
Choose a target game, resolution and quality level. Look for measured benchmarks under comparable conditions. A larger VRAM figure alone does not tell you which card is faster, and a generic bottleneck percentage is not a reliable purchasing decision.
Check the physical installation
Partner cards can differ in length, thickness and connector placement even when they use the same GPU. Check the exact card model against the case, radiator, expansion slots and cable-bend requirements. Leave the clearances specified by the manufacturer.
Check the whole power path
Follow the card manufacturer’s PSU recommendation and connector guidance. Verify that your PSU has supported cables. Never use a modular cable from a different power supply merely because it fits. Shut down and unplug before installing parts.
Measure before and after
Save a baseline benchmark before changing hardware. After installation, use official drivers and test the same game version, route and settings. Keep the return window in mind and investigate crashes or abnormal noise promptly.