How much VRAM does openPangu-2.0-Flash need?

Its published quantizations range from 40.73 GiB to 188.04 GiB in weights alone, before KV cache and runtime overhead.

openPangu-2.0-Flash on Radeon RX 6500 XT

Can I run openPangu-2.0-Flash on a Radeon RX 6500 XT?

Q: Can I run openPangu-2.0-Flash on a Radeon RX 6500 XT?

No. No published quantization of openPangu-2.0-Flash fits a Radeon RX 6500 XT at any context with q4_0 KV cache.

Not at these settings. No indexed quantization of openPangu-2.0-Flash fits Radeon RX 6500 XT at any context we compute, with q4_0 KV. The smallest shipped quantization is 40.73 GiB in weights alone, against 3.72 GiB usable. CPU offload can still run it, slowly.

From the file· weights summed from filesFrom the file· KV computed per layerPredicted· speed and compute buffer

KV cache dtypef16 q8_0 q4_0— 4 GB card, 3.72 GiB usable after overhead

Every quantization at every context

total memory required; green fits, red does not

Quant	Weights●	4K◐	8K◐	16K◐	32K◐	64K◐	128K◐
BF16	188.04 GiB	189.0	189.1	189.2	189.4	189.9	190.8
Q8_0	99.98 GiB	100.9	101.0	101.1	101.3	101.8	102.7
Q4_K_M	56.71 GiB	57.7	57.7	57.8	58.1	58.5	59.4
Q3_K_M	40.73 GiB	41.7	41.7	41.9	42.1	42.5	43.5

●From the file◐Predictedwhat these mean

Figures are GiB of total memory: weights plus KV cache plus compute buffer and backend overhead. Weights and KV are near-exact; the overhead term is modeled. Hover any cell for the breakdown.

Why other calculators disagree

A parameters × bits ÷ 8 estimate ignores two things that dominate at long context. First, the weights themselves are not the nominal rate — quantizations are mixtures, so the real file is consistently larger than the label implies. Second, this model uses latent attention and allocates no V cache at all, so any formula reading num_key_value_heads overstates its cache by more than an order of magnitude.