Which is better for ai & machine learning: NVIDIA A40 or NVIDIA B300?

NVIDIA B300 performs better for ai & machine learning, winning 9 of 9 benchmarks in our suite with an average 478.3% advantage.

What are the main hardware differences between NVIDIA A40 and NVIDIA B300?

NVIDIA A40 has 48GB VRAM and a 300W TDP, while NVIDIA B300 has 288GB VRAM and a 1400W TDP.

Does VRAM matter more than speed between NVIDIA A40 and NVIDIA B300?

For AI, yes, NVIDIA A40 fits 2 more of our 12 workloads than NVIDIA B300. A model that exceeds VRAM doesn't run slower, it doesn't run at all, so the card that fits the model wins that workload outright.

Where is the biggest performance difference between NVIDIA A40 and NVIDIA B300?

Z-Image Turbo: NVIDIA B300 leads by roughly 1130% (3.225 vs 39.675 images/min) in our testing.

NVIDIA A40 vs NVIDIA B300, AI & Machine Learning Comparison

NVIDIA B300 wins 9 of 9 benchmarks, averaging 478.3% faster.

NVIDIA A40's numbers are anchored estimates calibrated against our measured cards, pending first-party measurement. Treat small gaps as ties.

What the numbers say

The gap is widest in Z-Image Turbo, where NVIDIA B300 leads by 1130% (3.225 vs 39.675 images/min); the closest fight is Qwen3 4B (107% apart); VRAM decides part of this one: NVIDIA A40 runs 140 of our 12 AI workloads while the other card runs 8, models that don't fit score zero.

Benchmark results head-to-head

Benchmark	NVIDIA A40	NVIDIA B300	Difference
Qwen3 4B tok/s	160.79	333.34	-52%
Llama 3.1 8B tok/s	106.18	287.23	-63%
Qwen2.5-Coder 14B tok/s	57.85	158.49	-63%
Qwen3 32B tok/s	26.89	83.68	-68%
Llama 3.3 70B tok/s	0	47.97	n/a
Stable Diffusion XL images/min	9.2	29.2	-68%
Z-Image Turbo images/min	3.225	39.675	-92%
FLUX.1 dev images/min	1.95	20.807	-91%
Wan 2.2 5B (720p) frames/s	0.31	2.94	-89%

Whole-job comparison

How long each card takes to finish a complete pipeline, not just one model. NVIDIA A40 is faster on 0 of 3; NVIDIA B300 on 3.

Workflow	NVIDIA A40	NVIDIA B300	Difference	Cost per run
24-frame storyboard	10.2 min	1.5 min	NVIDIA B300 6.81x faster	$0.060 vs $0.174
Full codebase review	17.3 min	6.3 min	NVIDIA B300 2.74x faster	$0.101 vs $0.730
10 short social clips	33.4 min	4.7 min	NVIDIA B300 7.05x faster	$0.195 vs $0.548

Renting by the hour, NVIDIA A40 finishes 3 of 3 cheaper. The quicker card is not automatically the cheaper way to get the work done.

Cost to rent

Card	Per hour
NVIDIA A40	$0.350
NVIDIA B300	$6.940

NVIDIA A40 is 19.83x cheaper per hour. Cheapest on-demand rate we see across RunPod and Vast.

Specifications compared

	NVIDIA A40	NVIDIA B300
VRAM	48GB	288GB
Architecture	Ampere	Blackwell Ultra
Memory bandwidth	696 GB/s	8 TB/s
Boost clock	1,740 MHz	n/a
TDP	300 W	1400 W
Launch MSRP	$5,000	$40,000
Release	2020-10-05	2025-11-01

FAQ

Which is better for ai & machine learning: NVIDIA A40 or NVIDIA B300?: NVIDIA B300 performs better for ai & machine learning, winning 9 of 9 benchmarks in our suite with an average 478.3% advantage.
What are the main hardware differences between NVIDIA A40 and NVIDIA B300?: NVIDIA A40 has 48GB VRAM and a 300W TDP, while NVIDIA B300 has 288GB VRAM and a 1400W TDP.
Does VRAM matter more than speed between NVIDIA A40 and NVIDIA B300?: For AI, yes, NVIDIA A40 fits 2 more of our 12 workloads than NVIDIA B300. A model that exceeds VRAM doesn't run slower, it doesn't run at all, so the card that fits the model wins that workload outright.
Where is the biggest performance difference between NVIDIA A40 and NVIDIA B300?: Z-Image Turbo: NVIDIA B300 leads by roughly 1130% (3.225 vs 39.675 images/min) in our testing.

NVIDIA A40 full review · NVIDIA B300 full review · All AI & Machine Learning rankings