AMD MI455X vs Nvidia A800

The MI455X is newer, with 11x the memory and 15x the bandwidth.

At a glance

Memory

11x more on MI455X

MI455X: 432 GB

A800: 40 GB

Memory bandwidth

15x higher on MI455X

MI455X: 23.30 TB/s

A800: 1.55 TB/s

Cheapest on-demand

MI455X is not sold on demand

MI455X: --

A800: $1.18 /GPU/hr

Price comparison

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

Billing	MI455X	A800	Difference
On-demand	No on-demand listings	-- /GPU/hr from $1.18

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 on the A800: 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

MI455X vs A800 price history

Weekly median on-demand price per GPU per hour

Last 12 months

Aggregating historical prices...

Specs comparison

Spec	MI455X	A800	Difference
Memory
Capacity	432 GB HBM4	40 GB HBM2	11x more on MI455X
Bandwidth	23,300 GB/s	1,555 GB/s	15x higher on MI455X
Bus width		5,120-bit
Compute · dense
FP4	40,265 TFLOPS	Not supported	MI455X only
FP8	20,133 TFLOPS	Not supported	MI455X only
FP16 / BF16	5,033 TFLOPS	312 TFLOPS	16x higher on MI455X
INT8	5,033 TOPS	623.5 TOPS	8.1x higher on MI455X
FP32	315 TFLOPS	19.5 TFLOPS	16x higher on MI455X
FP64	Not supported	9.7 TFLOPS	A800 only
Platform
Interconnect	Infinity Fabric 3,600 GB/s	NVLink 400 GB/s	9x higher on MI455X
Released	Q3 2026	Q4 2022	4 years newer on MI455X
Precision
Supported formats	FP4FP6FP8FP16BF16FP32INT8	FP16BF16TF32FP32FP64INT4INT8

Figures are for each model's headline configuration. Where a form factor carries a different number, it is named under the figure.

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

Source: MI455X datasheet and A800 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	A800
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	--
GPUhub Singapore	--	$1.18 /GPU/hr On-demand NVL