AMD MI455X vs AMD Radeon RX 7900 XTX

The MI455X is newer, with 18x the memory and 24x the bandwidth.

At a glance

Memory

18x more on MI455X

MI455X: 432 GB

Radeon RX 7900 XTX: 24 GB

Memory bandwidth

24x higher on MI455X

MI455X: 23,300 GB/s

Radeon RX 7900 XTX: 960 GB/s

Cheapest on-demand

MI455X is not sold on demand

MI455X: --

Radeon RX 7900 XTX: $0.17 /GPU/hr

Price comparison

Median price per GPU per hour by billing type, with the cheapest listing under it.

Billing	MI455X	Radeon RX 7900 XTX	Difference
On-demand	No on-demand listings	-- /GPU/hr from $0.17
Spot	No spot listings	-- /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 on-demand and spot on the Radeon RX 7900 XTX: 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 7900 XTX	Difference
Memory
Capacity	432 GB HBM4	24 GB GDDR6	18x more on MI455X
Bandwidth	23,300 GB/s	960 GB/s	24x higher on MI455X
Bus width		384-bit
Compute · dense
FP4	40,265 TFLOPS	Not supported	MI455X only
FP8	20,133 TFLOPS	Not supported	MI455X only
FP16 / BF16	5,033 TFLOPS	123 TFLOPS	41x higher on MI455X
INT8	5,033 TOPS	123 TOPS	41x higher on MI455X
FP32	315 TFLOPS	61.4 TFLOPS	5.1x 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	FP16BF16FP32INT4INT8

Compute: Vendor peak figures, dense and per GPU. Not measured throughput.

Source: MI455X datasheet and Radeon RX 7900 XTX 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 7900 XTX
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	--	$0.17 /GPU/hr On-demand