AMD MI455X
vs
Nvidia RTX 4090
The MI455X is newer, with 18x the memory and 23x the bandwidth. 5 providers list it, against 20 for the RTX 4090.
At a glance
Memory
18x more on MI455X
- MI455X
- 432 GB
- RTX 4090
- 24 GB
Memory bandwidth
23x higher on MI455X
- MI455X
- 23.30 TB/s
- RTX 4090
- 1.01 TB/s
Cheapest on-demand
MI455X is not sold on demand
- MI455X
- --
- RTX 4090
- $0.33 /GPU/hr
Price comparison
Median price per GPU per hour by billing type, with the cheapest listing under it.
| Billing | MI455X | RTX 4090 | Difference |
|---|---|---|---|
| On-demand | No on-demand listings | $0.44 /GPU/hr from $0.33 | |
| Reserved | No reserved listings | $0.52 /GPU/hr from $0.37 (6 mo) | |
| Spot | No spot listings | $0.38 /GPU/hr from $0.16 |
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 RTX 4090 price history
Weekly median on-demand price per GPU per hour
Specs comparison
| Spec | MI455X | RTX 4090 | Difference |
|---|---|---|---|
| Memory | |||
| Capacity | 432 GB HBM4 | 24 GB GDDR6X | 18x more on MI455X |
| Bandwidth | 23,300 GB/s | 1,010 GB/s | 23x higher on MI455X |
| Bus width | 384-bit | ||
| Compute · dense | |||
| FP4 | 40,265 TFLOPS | Not supported | MI455X only |
| FP8 | 20,133 TFLOPS | 330.3 TFLOPS | 61x higher on MI455X |
| FP16 / BF16 | 5,033 TFLOPS | 165.2 TFLOPS | 30x higher on MI455X |
| INT8 | 5,033 TOPS | 660.6 TOPS | 7.6x higher on MI455X |
| FP32 | 315 TFLOPS | 82.6 TFLOPS | 3.8x higher on MI455X |
| Platform | |||
| Interconnect | Infinity Fabric 3,600 GB/s | PCIe only | Infinity Fabric on MI455X only |
| Released | Q3 2026 | Q4 2022 | 4 years newer on MI455X |
| Precision | |||
| Supported formats | FP4FP6FP8FP16BF16FP32INT8 | FP8FP16BF16TF32FP32INT4INT8 | |
Compute: Vendor peak figures, dense and per GPU. Not measured throughput.
Source: MI455X datasheet and RTX 4090 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 | RTX 4090 |
|---|---|---|
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
|
-- | $0.33 /GPU/hr On-demand |
Vast.ai
USA
|
-- | $0.37 /GPU/hr On-demand |
Theta EdgeCloud
Distributed
|
-- | $0.38 /GPU/hr On-demand |
Packet·ai
USA
|
-- | $0.39 /GPU/hr On-demand |
GPU.ai
UAE
|
-- | $0.41 /GPU/hr On-demand |
Runcrate
USA
|
-- | $0.44 /GPU/hr On-demand PCIe |
Sesterce
France
|
-- | $0.44 /GPU/hr On-demand |
Lium
Distributed
|
-- | $0.55 /GPU/hr On-demand |
5 providers list the MI455X and 20 the RTX 4090. Every listing is on the MI455X page and the RTX 4090 page.
Similar GPUs
Other comparisons in the same class.
-
Nvidia B300
288 GB HBM3e · 66% less bandwidth than the MI455X
From $4.99 /GPU/hr Compare
-
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 RTX 5090
32 GB GDDR7 · 77% more bandwidth than the RTX 4090
From $0.35 /GPU/hr Compare
-
Nvidia L40S
48 GB GDDR6 · 14% less bandwidth than the RTX 4090
From $0.55 /GPU/hr Compare
Our data for AMD MI455X was last updated on Sept. 14, 2026, and for Nvidia RTX 4090 on Sept. 14, 2026.