Overview
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.
Nvidia K620
The Nvidia K620 is a workstation GPU on the Maxwell architecture, released Q3 2014, with 2 GB DDR3 and 29 GB/s memory bandwidth.
Memory per GPU
144x more on GB300
GB300
K620
Memory bandwidth
276x higher on GB300
GB300
K620
GPU interconnect
GB300
K620
Peak performance (FP32)
93x higher on GB300
GB300
K620
Vendor peak figures, dense and per GPU. Not measured throughput.
FP32 per watt
3x higher on GB300
GB300
K620
Board power
31x higher on GB300
GB300
K620
Precision support
GB300
K620
Highlighted formats are supported by only one of the two.
Architecture
GB300
K620
Released
11 years newer on GB300
GB300
K620
Source: GB300 datasheet and K620 datasheet.
Price comparison
Cheapest on-demand
GB300
K620
Typical rate
GB300
K620
Median across providers, one vote each, so a large catalog does not outweigh a small one.
Providers listing it
GB300
K620
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.
GB300 Offers
0 of 6 providers report available stock.
K620 Offers
No provider publishes a stock status.
No active offerings found
Similar GPUs
Other comparisons in the same class:
Our data for Nvidia GB300 was last updated on Aug. 31, 2026, and for Nvidia K620 on Aug. 31, 2026.