The B300 is newer, with 12x the memory and 8.5x the bandwidth. The RTX 3090 is typically cheaper.
At a glance
Memory
12x more on B300
- B300
- 288 GB
- RTX 3090
- 24 GB
Memory bandwidth
8.5x higher on B300
- B300
- 8,000 GB/s
- RTX 3090
- 936 GB/s
Cheapest on-demand
98% cheaper on RTX 3090
- B300
- $4.99 /GPU/hr
- RTX 3090
- $0.10 /GPU/hr
Price comparison
Median price per GPU per hour by billing type, with the cheapest listing under it.
| Billing | B300 | RTX 3090 | Difference |
|---|---|---|---|
| On-demand | $8.50 /GPU/hr from $4.99 | $0.19 /GPU/hr from $0.10 | 98% cheaper on RTX 3090 |
| Reserved | $6.25 /GPU/hr from $4.25 | -- /GPU/hr from $0.06 (1 mo) | |
| Spot | $5.07 /GPU/hr from $2.99 | -- /GPU/hr from $0.07 |
Heads up: A provider's own page may quote a different figure, for example on tax, region or a promotion. A monthly-only plan shows a derived hourly rate. Medians are across providers, one vote each, so a large catalog does not outweigh a small one. No median for reserved and spot on the RTX 3090: we only show one when at least 3 providers list the GPU on that billing type. Verify before provisioning. More on how we price.
Price history
B300 vs RTX 3090 price history
Weekly median on-demand price per GPU per hour
Specs comparison
| Spec | B300 | RTX 3090 | Difference |
|---|---|---|---|
| Memory | |||
| Capacity | 288 GB HBM3e | 24 GB GDDR6X | 12x more on B300 |
| Bandwidth | 8,000 GB/s | 936 GB/s | 8.5x higher on B300 |
| Bus width | 8,192-bit | 384-bit | 21x wider on B300 |
| Compute · dense | |||
| FP4 | 14,000 TFLOPS | Not supported | B300 only |
| FP8 | 4,500 TFLOPS | Not supported | B300 only |
| FP16 / BF16 | 2,250 TFLOPS | 71.2 TFLOPS | 32x higher on B300 |
| INT8 | 153.5 TOPS | 284.7 TOPS | 85% higher on RTX 3090 |
| FP32 | 75 TFLOPS | 35.6 TFLOPS | 2.1x higher on B300 |
| FP64 | 1.2 TFLOPS | Not supported | B300 only |
| Platform | |||
| Interconnect | NVLink 1,800 GB/s | NVLink 112 GB/s | 16x higher on B300 |
| Board power | 1,100 W | 350 W | 3.1x higher on B300 |
| Released | Q1 2025 | Q3 2020 | 4 years newer on B300 |
| Precision | |||
| Supported formats | FP4FP6FP8FP16BF16TF32FP32FP64INT8 | FP16BF16TF32FP32INT4INT8 | |
Compute: Vendor peak figures, dense and per GPU. Not measured throughput.
Source: B300 datasheet and RTX 3090 datasheet.
Where to rent them
Providers that rent these GPUs, with each one's cheapest rate. Providers that rent both are listed first.
| Provider | B300 | RTX 3090 |
|---|---|---|
Lium
Distributed
|
$7.85 /GPU/hr On-demand SXM | $0.16 /GPU/hr On-demand |
Vast.ai
USA
|
$9.94 /GPU/hr On-demand | $0.11 /GPU/hr On-demand |
GPU.ai
UAE
|
$7.89 /GPU/hr On-demand SXM | $0.15 /GPU/hr On-demand |
Runpod
USA
|
$7.89 /GPU/hr On-demand SXM | $0.22 /GPU/hr On-demand |
Daytona
USA
|
$7.10 /GPU/hr On-demand | -- |
EmpirioLabs AI
USA
|
$16.00 /GPU/hr On-demand | -- |
Lyceum
Germany
|
$2.99 /GPU/hr Spot | -- |
Spheron
Singapore
|
$5.81 /GPU/hr Spot SXM | -- |
HyperAI
Hong Kong
|
-- | $0.10 /GPU/hr On-demand |
Salad
Distributed
|
-- | $0.17 /GPU/hr On-demand |
SwissGPU
Switzerland
|
-- | $0.30 /GPU/hr On-demand |
TensorDock
Distributed
|
-- | $0.31 /GPU/hr On-demand |
34 providers list the B300 and 9 the RTX 3090. Every listing is on the B300 page and the RTX 3090 page.
Similar GPUs
Other comparisons in the same class.
-
Nvidia H100
80 GB HBM3 · 58% less bandwidth than the B300
From $1.60 /GPU/hr Compare -
Nvidia B200
180 GB HBM3e · released Q1 2024
From $3.75 /GPU/hr Compare
-
Nvidia H200
141 GB HBM3e · 40% less bandwidth than the B300
From $2.09 /GPU/hr Compare
-
Nvidia RTX 5090
32 GB GDDR7 · 91% more bandwidth than the RTX 3090
From $0.35 /GPU/hr Compare
-
Nvidia RTX 4090
24 GB GDDR6X · PCIe only
From $0.33 /GPU/hr Compare
Our data for Nvidia B300 was last updated on Sept. 14, 2026, and for Nvidia RTX 3090 on Sept. 14, 2026.