ROG Astral RTX 5090 OC vs GeForce RTX 5080

VRAM is fast on-card memory dedicated to the GPU. Modern AAA games at 4K with ray tracing comfortably exceed 12 GB; with frame generation enabled, 16 GB is the new comfortable floor.

How much you need

• 1080p high settings — 8 GB minimum, 12 GB comfortable.
• 1440p high — 12 GB minimum, 16 GB comfortable.
• 4K with RT — 16 GB minimum, 20 GB+ for headroom.
• AI / LLM inference — as much as you can buy; 24 GB unlocks 30B parameter models in 4-bit.

VRAM types

• GDDR6 — RTX 30, RX 6000/7000.
• GDDR6X — higher bandwidth, hotter; RTX 40/50.
• GDDR7 — RTX 50-series flagships.
• HBM3/HBM3e — pro/datacenter.

Bus width matters as much as capacity — a 12 GB card on a 128-bit bus often performs worse than an 8 GB card on a 256-bit bus.