Overview

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

Nvidia logo 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.

Budget Workstation

Memory per GPU

144x more on GB300
Nvidia logo GB300
288 GB HBM3e
Nvidia logo K620
2 GB DDR3

Memory bandwidth

276x higher on GB300
Nvidia logo GB300
8,000 GB/s
Nvidia logo K620
29 GB/s

GPU interconnect

Nvidia logo GB300
NVLink 1,800 GB/s
Nvidia logo K620
PCIe only

Peak performance (FP32)

93x higher on GB300
Nvidia logo GB300
80 TFLOPS
Nvidia logo K620
0.9 TFLOPS

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

FP32 per watt

3x higher on GB300
Nvidia logo GB300
0.06 TFLOPS/W
Nvidia logo K620
0.02 TFLOPS/W

Board power

31x higher on GB300
Nvidia logo GB300
1,400 W
Nvidia logo K620
45 W

Precision support

Nvidia logo GB300
FP4 FP6 FP8 FP16 BF16 TF32 FP32 FP64 INT8
Nvidia logo K620
FP32

Highlighted formats are supported by only one of the two.

Architecture

Nvidia logo GB300
Grace Blackwell Ultra
Nvidia logo K620
Maxwell

Released

11 years newer on GB300
Nvidia logo GB300
Q1 2025
Nvidia logo K620
Q3 2014

Price comparison

Cheapest on-demand

Nvidia logo GB300
$18.00 / GPU / hr
Nvidia logo K620
--

Typical rate

Nvidia logo GB300
$18.00 / GPU / hr
Nvidia logo K620
--

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

Providers listing it

Nvidia logo GB300
6
Nvidia logo K620
None

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 Nvidia GB300 was last updated on Aug. 31, 2026, and for Nvidia K620 on Aug. 31, 2026.