The MI455X is newer, with 27x the memory and 37x the bandwidth.
At a glance
Memory
27x more on MI455X
- MI455X
- 432 GB
- Radeon RX 7800 XT
- 16 GB
Memory bandwidth
37x higher on MI455X
- MI455X
- 23,300 GB/s
- Radeon RX 7800 XT
- 624 GB/s
Cheapest on-demand
MI455X is not sold on demand
- MI455X
- --
- Radeon RX 7800 XT
- $0.13 /GPU/hr
Price comparison
Median price per GPU per hour by billing type, with the cheapest listing under it.
| Billing | MI455X | Radeon RX 7800 XT | Difference |
|---|---|---|---|
| On-demand | No on-demand listings | -- /GPU/hr from $0.13 | |
| Spot | No spot listings | -- /GPU/hr from $0.04 |
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 on-demand and spot on the Radeon RX 7800 XT: we only show one when at least 3 providers list the GPU on that billing type. Verify before provisioning. More on how we price.
Specs comparison
| Spec | MI455X | Radeon RX 7800 XT | Difference |
|---|---|---|---|
| Memory | |||
| Capacity | 432 GB HBM4 | 16 GB GDDR6 | 27x more on MI455X |
| Bandwidth | 23,300 GB/s | 624 GB/s | 37x higher on MI455X |
| Bus width | 256-bit | ||
| Compute · dense | |||
| FP4 | 40,265 TFLOPS | Not supported | MI455X only |
| FP8 | 20,133 TFLOPS | Not supported | MI455X only |
| FP16 / BF16 | 5,033 TFLOPS | 74.6 TFLOPS | 67x higher on MI455X |
| INT8 | 5,033 TOPS | 74.6 TOPS | 67x higher on MI455X |
| FP32 | 315 TFLOPS | 37.3 TFLOPS | 8.4x higher on MI455X |
| Platform | |||
| Interconnect | Infinity Fabric 3,600 GB/s | PCIe only | Infinity Fabric on MI455X only |
| Released | Q3 2026 | Q3 2023 | 3 years newer on MI455X |
| Precision | |||
| Supported formats | FP4FP6FP8FP16BF16FP32INT8 | FP16BF16FP32INT4INT8 | |
Compute: Vendor peak figures, dense and per GPU. Not measured throughput.
Source: MI455X datasheet and Radeon RX 7800 XT 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 | Radeon RX 7800 XT |
|---|---|---|
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 | -- |
Salad
Distributed
|
-- | $0.13 /GPU/hr On-demand |
Similar GPUs
Other comparisons in the same class.
-
-
Nvidia GB300
288 GB HBM3e · 66% less bandwidth than the MI455X
On-demand from $18.00 /GPU/hr -
-
-
AMD Radeon RX 9060 XT
16 GB GDDR6 · 49% less bandwidth than the Radeon RX 7800 XT
On-demand from $0.13 /GPU/hr
Our data for AMD MI455X was last updated on Sept. 14, 2026, and for AMD Radeon RX 7800 XT on Nov. 13, 2026.