MI455X vs GB300

Both target rack-scale deployments: the MI455X ships in 72-GPU Helios racks with UALink, while the GB300 NVL72 combines 72 Blackwell Ultra GPUs with Grace CPUs over NVLink. Choose MI455X for HBM4 capacity, GB300 for the CUDA ecosystem.

Overview

AMD logo AMD MI455X

The AMD MI455X is a data center GPU on the CDNA 5 architecture, released Q3 2026, with 432 GB HBM4 and 23,300 GB/s memory bandwidth.

High Performance Datacenter

Nvidia logo Nvidia GB300

The Nvidia GB300 is a data center GPU on the Grace Blackwell Ultra architecture, released Q1 2025, with 288 GB HBM3e and 8,000 GB/s memory bandwidth.

High Performance Datacenter

Memory per GPU

1.5x more on MI455X
AMD logo MI455X
432 GB HBM4
Nvidia logo GB300
288 GB HBM3e

Memory bandwidth

2.9x higher on MI455X
AMD logo MI455X
23,300 GB/s
Nvidia logo GB300
8,000 GB/s

GPU interconnect

2x higher on MI455X
AMD logo MI455X
Infinity Fabric 3,600 GB/s
Nvidia logo GB300
NVLink 1,800 GB/s

Peak performance (FP4)

2.7x higher on MI455X
AMD logo MI455X
40,265 TFLOPS
Nvidia logo GB300
15,000 TFLOPS

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

Precision support

AMD logo MI455X
FP4 FP6 FP8 FP16 BF16 FP32 INT8
Nvidia logo GB300
FP4 FP6 FP8 FP16 BF16 TF32 FP32 FP64 INT8

Highlighted formats are supported by only one of the two.

Architecture

AMD logo MI455X
CDNA 5
Nvidia logo GB300
Grace Blackwell Ultra

Released

16 months newer on MI455X
AMD logo MI455X
Q3 2026
Nvidia logo GB300
Q1 2025

Price comparison

Cheapest on-demand

AMD logo MI455X
--
Nvidia logo GB300
$18.00 / GPU / hr

Typical rate

AMD logo MI455X
--
Nvidia logo GB300
$18.00 / GPU / hr

Median across providers, one vote each, so a large catalog does not outweigh a small one.

Providers listing it

2 more on GB300
AMD logo MI455X
5
Nvidia logo GB300
7

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. Verify before provisioning. More on how we price.

Offers and availability

How this list works

Order

Each provider appears once per GPU. We pick the one configuration that speaks for that provider, and rank on it in this order:

  1. Availability: in stock, then waitlist, then not reported, then out of stock. A price you can act on outranks a cheaper one you cannot.
  2. Billing type: on-demand first, then reserved, then spot, then quote-only. On-demand leads because it is the only rate you can hold without committing to anything.
  3. Price: the lowest per-GPU hourly rate the provider lists, converted to USD.

The configuration we pick is chosen the same way, availability before billing before price. The rest of that provider's configurations are on the GPU's own page.

Ties sort alphabetically. Reserved rates are not separated by term length, so a three-year commitment can sit above a one-month one: the label beneath each price says which you are looking at. Providers who publish no rate are listed last within their group.

Transparency and funding

  • Ads and sponsors: Paid placements sit at the top of the list and are always labeled as sponsored content. Sponsorship never influences the organic ranking itself.
  • Affiliates: Affiliate links are marked. We may earn a commission if you click them, but commissions never affect the order.
  • Prices: Shown in USD, converted at daily reference rates where a provider publishes in another currency. A month means 720 hours. How we estimate costs.

Similar GPUs

Other comparisons in the same class:

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Our data for AMD MI455X was last updated on Sept. 3, 2026, and for Nvidia GB300 on Sept. 3, 2026.