AMD MI455X
vs
Nvidia B300
The MI455X is newer, with 50% more memory and 2.9x the bandwidth. 5 providers list it, against 33 for the B300.
At a glance
Memory
50% more on MI455X
- MI455X
- 432 GB
- B300
- 288 GB
Memory bandwidth
2.9x higher on MI455X
- MI455X
- 23.30 TB/s
- B300
- 8.00 TB/s
Cheapest on-demand
MI455X is not sold on demand
- MI455X
- --
- B300
- $4.99 /GPU/hr
Price comparison
Median price per GPU per hour by billing type, with the cheapest listing under it.
| Billing | MI455X | B300 | Difference |
|---|---|---|---|
| On-demand | No on-demand listings | $7.94 /GPU/hr from $4.99 | |
| Reserved | No reserved listings | $6.50 /GPU/hr from $4.25 | |
| Spot | No spot listings | $5.41 /GPU/hr from $4.48 |
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. Verify before provisioning. More on how we price.
Price history
MI455X vs B300 price history
Weekly median on-demand price per GPU per hour
Specs comparison
| Spec | MI455X | B300 | Difference |
|---|---|---|---|
| Memory | |||
| Capacity | 432 GB HBM4 | 288 GB HBM3e | 50% more on MI455X |
| Bandwidth | 23,300 GB/s | 8,000 GB/s | 2.9x higher on MI455X |
| Bus width | 8,192-bit | ||
| Compute · dense | |||
| FP4 | 40,265 TFLOPS | 14,000 TFLOPS | 2.9x higher on MI455X |
| FP8 | 20,133 TFLOPS | 4,500 TFLOPS | 4.5x higher on MI455X |
| FP16 / BF16 | 5,033 TFLOPS | 2,250 TFLOPS | 2.2x higher on MI455X |
| INT8 | 5,033 TOPS | 153.5 TOPS | 33x higher on MI455X |
| FP32 | 315 TFLOPS | 75 TFLOPS | 4.2x higher on MI455X |
| FP64 | Not supported | 1.2 TFLOPS | B300 only |
| Platform | |||
| Interconnect | Infinity Fabric 3,600 GB/s | NVLink 1,800 GB/s | 2x higher on MI455X |
| Released | Q3 2026 | Q1 2025 | 16 months newer on MI455X |
| Precision | |||
| Supported formats | FP4FP6FP8FP16BF16FP32INT8 | FP4FP6FP8FP16BF16TF32FP32FP64INT8 | |
Compute: Vendor peak figures, dense and per GPU. Not measured throughput.
Source: MI455X datasheet and B300 datasheet.
Where to rent them
Providers that rent these GPUs, with each one's cheapest rate. No provider we track offers both right now.
| Provider | MI455X | B300 |
|---|---|---|
Azure
USA
|
On request Custom | -- |
Cirrascale
USA
|
On request Custom | -- |
Oracle Cloud
USA
|
On request Custom | -- |
TensorWave
USA
|
On request Custom | -- |
Vultr
USA
|
On request Custom | -- |
Runpod
USA
|
-- | $7.89 /GPU/hr On-demand SXM |
Lyceum
Germany
|
-- | $7.99 /GPU/hr On-demand |
Lium
Distributed
|
-- | $8.25 /GPU/hr On-demand SXM |
Verda
Finland
|
-- | $8.29 /GPU/hr On-demand SXM |
Vast.ai
USA
|
-- | $13.13 /GPU/hr On-demand |
EmpirioLabs AI
USA
|
-- | $16.50 /GPU/hr On-demand |
Spheron
Singapore
|
-- | $5.81 /GPU/hr Spot SXM |
GPUaaS
USA
|
-- | On request Custom SXM |
5 providers list the MI455X and 33 the B300. Every listing is on the MI455X page and the B300 page.
Similar GPUs
Other comparisons in the same class.
-
AMD MI355X
288 GB HBM3e · 66% less bandwidth than the MI455X
From $5.99 /GPU/hr Compare
-
Nvidia GB300
288 GB HBM3e · 66% less bandwidth than the MI455X
From $18.00 /GPU/hr Compare
-
Nvidia H100
80 GB HBM3 · 58% less bandwidth than the B300
From $1.30 /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
Our data for AMD MI455X was last updated on Sept. 14, 2026, and for Nvidia B300 on Sept. 14, 2026.