RigBase dataset: used RTX 3090 delivers 3x more tok/s per euro than RTX 5090

An analysis of the open RigBase dataset (117 home AI builds, 298 measured results, 48 models) divides tokens/sec by current GPU price. A used RTX 3090 at €1,248 gives 3.1–3.2x more tok/s per euro than an RTX 5090 at €7,140, which is only 1.76–1.86x faster. Speculative decoding yielded a median 1.76x speedup.

• RTX 5090 is 1.76–1.86x faster than a 3090 but costs about 5.7x more
• On gpt-oss 20B the €429 RTX 3060 leads value at 195.7 tok/s per €1,000
• Speculative decoding speeds generation 1.26–2.45x, median 1.76x
• Dataset: 117 builds, 298 results, 48 models, 33 sources, CC BY 4.0