Why We Optimize Natively: Hardware Block Compression Over Neural Upscaling

Direct empirical bake-off between open GPU block compression (BCn) and neural texture codecs (NTC).

Core Finding:Neural texture compression (NTC) and temporal upscaling promise massive memory reductions, but introduce proprietary SDK dependencies and neural reconstruction overhead. In direct empirical bake-offs on 2048² PBR maps, standard GPU hardware block compression achieved a 6.4x VRAM reduction while outperforming neural codecs on normal and height fidelity.

Payload Reduction

6.4x (84.4%)

Payload reduced from 85.3 MiB (RGBA8 level-0+mips) to 13.34 MiB (.ktx2).

Height Map Fidelity

58.12 dB (BC4)

BC4 PSNR was 58.12 dB vs NTC low (50.46 dB) and NTC default (53.90 dB).

Normal Map Fidelity

57.77 dB (BC5)

BC5 PSNR was 57.77 dB vs NTC low (48.07 dB) and NTC default (53.30 dB).

Device VRAM Saved

960 -> 736 MiB

Engine device VRAM dropped by 224 MiB (23.3% heap savings) on identical scenes.

Empirical Findings Table

Compression ratio, PSNR fidelity, and VRAM residency on 2048² PBR asset sets

Telemetry Metric	Measured Value	Context & Observability
Payload Reduction	6.4x (84.4%)	Payload reduced from 85.3 MiB (RGBA8 level-0+mips) to 13.34 MiB (.ktx2).
Height Map Fidelity	58.12 dB (BC4)	BC4 PSNR was 58.12 dB vs NTC low (50.46 dB) and NTC default (53.90 dB).
Normal Map Fidelity	57.77 dB (BC5)	BC5 PSNR was 57.77 dB vs NTC low (48.07 dB) and NTC default (53.30 dB).
Device VRAM Saved	960 -> 736 MiB	Engine device VRAM dropped by 224 MiB (23.3% heap savings) on identical scenes.

Engineering Action Directives

Standard GPU hardware block compression formats (BC4/BC5) can achieve higher mathematical reconstruction fidelity on geometric maps than neural texture compression, with zero runtime SDK dependency.
Native hardware formats eliminate proprietary driver lock-in while reducing VRAM footprints by over 80%.

Methodology Boundaries & Limits

Asset scope: Evaluated on four 2048² Substance-baked PBR maps; highly complex organic or photographic texture sets may exhibit different compression trade-offs.
Fixed resolution: Benchmarked at native 2048² texture resolution; does not measure extreme mipmap streaming under severe memory oversubscription.