B300 vs GB300
Both use Blackwell Ultra GPUs with 288GB HBM3e. The B300 ships in standard x86 systems, while the GB300 pairs the GPUs with Grace CPUs in a 72-GPU NVLink rack. Choose B300 for conventional server form factors, GB300 for rack-scale unified deployment.
Overview
Nvidia B300
The Nvidia B300 is a data center GPU on the Blackwell Ultra architecture, released Q1 2025, with up to 288 GB HBM3e and 8,000 GB/s memory bandwidth.
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.
Memory per GPU
Identical
B300
GB300
Memory bandwidth
Identical
B300
GB300
GPU interconnect
Identical
B300
GB300
Peak performance (FP4)
1.1x higher on GB300
B300
GB300
Vendor peak figures, dense and per GPU. Not measured throughput.
FP4 per watt
1.2x higher on B300
B300
GB300
Board power
1.3x higher on GB300
B300
GB300
Precision support
B300
GB300
Highlighted formats are supported by only one of the two.
Architecture
B300
GB300
Released
B300
GB300
Source: B300 datasheet and GB300 datasheet.
Price comparison
Cheapest on-demand
2.8x higher on GB300
B300
GB300
Typical rate
2.4x higher on GB300
B300
GB300
Median across providers, one vote each, so a large catalog does not outweigh a small one.
Spot floor
B300
GB300
Providers listing it
20 more on B300
B300
GB300
Price, last 90 days
B300
GB300
Change in the market-wide median, which moves when providers reprice and when cheaper or more expensive listings enter the market.
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:
- Availability: in stock, then waitlist, then not reported, then out of stock. A price you can act on outranks a cheaper one you cannot.
- 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.
- 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.
B300 Offers
5 of 26 providers report available stock.
GB300 Offers
0 of 6 providers report available stock.
Similar GPUs
Other comparisons in the same class:
Our data for Nvidia B300 was last updated on Aug. 31, 2026, and for Nvidia GB300 on Aug. 31, 2026.