Question 1

How much VRAM does Phi-4-reasoning need?

Accepted Answer

Phi-4-reasoning (14.7B) requires approximately 32.76655197143555 GB of VRAM at full precision (FP16), 16.4 GB at 8-bit quantization (Q8), and 8.2 GB at 4-bit quantization (Q4). The actual VRAM usage may be slightly higher due to KV cache and runtime overhead.

Question 2

What GPUs can run Phi-4-reasoning?

Accepted Answer

We have 10 compatible GPUs indexed for Phi-4-reasoning, including A40, L40S, L40, A100 40GB, RTX A6000 and 5 more. Compatibility is determined by whether the GPU's VRAM can fit the model's memory footprint, potentially using quantization to reduce memory usage.

Question 3

What is the cheapest GPU to run Phi-4-reasoning?

Accepted Answer

The cheapest GPU to run Phi-4-reasoning in the cloud is the A40 at $0.44/hr. Other affordable options include L40S ($0.60/hr) and L40 ($0.82/hr). Prices reflect the lowest on-demand rate across cloud providers.

Question 4

Can Phi-4-reasoning run on consumer hardware?

Accepted Answer

Yes, Phi-4-reasoning can run on consumer GPUs like the RTX A6000 (48 GB VRAM) at full precision (FP16).

Question 5

What quantization options are available for Phi-4-reasoning?

Accepted Answer

Phi-4-reasoning supports the following quantization levels: FP16 (full precision): ~32.76655197143555 GB, Q8 (8-bit): ~16.4 GB, Q6 (6-bit): ~12.3 GB, Q4 (4-bit): ~8.2 GB. Lower quantization reduces VRAM usage at the cost of some quality loss. Q8 offers a good balance between quality and memory savings, while Q4 provides maximum compression.

GPU	VRAM	Best Quant	From	Rent
A40	48 GB	FP16	$0.44/hr	Rent
L40S	48 GB	FP16	$0.60/hr	Rent
L40	48 GB	FP16	$0.82/hr	Rent
A100 40GB	40 GB	FP16	$0.93/hr	Rent
RTX A6000	48 GB	FP16	$1.09/hr
A100 80GB PCIe	80 GB	FP16	$1.39/hr	Rent
A100 80GB	80 GB	FP16	$1.39/hr	Rent
H100 MEGA	80 GB	FP16	$1.80/hr	Rent
H100 SXM	80 GB	FP16	$1.80/hr	Rent
H100 NVL	94 GB	FP16	$1.80/hr	Rent

Phi-4-reasoning

VRAM Requirements

Compatible GPUs

Phi-4-reasoning FAQ

VRAM requirements for Phi-4-reasoning at different quantization levels
Quantization	VRAM Required
FP16	32.8 GB
Q8	16.4 GB
Q6	12.3 GB
Q4	8.2 GB