Instances›AWS EC2›c6gn›c6gn.4xlarge
Compute
vCPUs16
Memory32 GiB
Mem / vCPU2.00 GiB
ProcessorGraviton2 Processor
Clock speed2.5 GHz
Architecturearm64
Storage
TypeEBS only
Bandwidth9,500 Mbps
Throughput1187.5 MB/s
IOPS40,000
Networking
Performance25 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
c6gn.medium1 vCPU · 2 GiB
c6gn.large2 vCPU · 4 GiB
c6gn.xlarge4 vCPU · 8 GiB
c6gn.2xlarge8 vCPU · 16 GiB
c6gn.4xlarge16 vCPU · 32 GiB
c6gn.8xlarge32 vCPU · 64 GiB
c6gn.12xlarge48 vCPU · 96 GiB
c6gn.16xlarge64 vCPU · 128 GiB
c6gn.metal64 vCPU · 128 GiB
c6gn.4xlarge

The c6gn.4xlarge is a compute-optimized AWS EC2 instance: 16 vCPU and 32 GiB of memory, 2.00 GiB per vCPU. In the name, "c" stands for compute, "6" is the generation, "gn" marks AWS Graviton (ARM) processors and enhanced networking and "4xlarge" is the size within the c6gn family. It runs on AWS Graviton2 Processor at 2.5 GHz, and AWS introduced it in December 2020. AWS has since shipped c7gn, c8gn and c9g; c7gn.4xlarge is the direct replacement at this size. Rackspace Spot's ch.vs1.2xlarge is a like-for-like substitute at 16 vCPU and 32 GiB, about 94% below the US East (N. Virginia) on-demand rate.

Match qualityx86 substitution

c6gn.4xlarge is Graviton (arm64). Rackspace Spot does not have arm64 servers, so ch.vs1.2xlarge is an x86_64 substitute with similar specs.

You will need x86 builds of your container images. Most software rebuilds without changes, but anything with compiled native code needs a real rebuild rather than a retag. Speed per core also differs between the two chips, so it is worth testing before deciding how many nodes to run.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$0.691$0.230$0.436$0.297$0.041
$0.650 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.111
Hong Kong$0.916$0.575$0.423$0.041
$0.875 savings
Sydney, Australia$0.904$0.325$0.571$0.419$0.041
$0.863 savings
London, UK$0.820$0.130$0.517$0.410$0.131
$0.689 savings
US West, San Jose$0.864$0.260$0.546$0.410$0.002
$0.862 savings
US Central, Dallas 2no AWS region$0.122
US East, N. Virginia 2$0.691$0.230$0.436$0.297$0.162
$0.529 savings
When to use it
Good for
  • ●Batch processing and CI/CD runners
  • ●Video encoding and transcoding
  • ●High-traffic web and API serving
  • ●Workloads that fit inside 32 GiB of RAM
  • ●Parallel work that can occupy 16 vCPU
  • ●Network-heavy services — AWS rates this size at 25 Gigabit
Avoid if
  • ●Starting a new deployment. c7gn.4xlarge is the newer generation at this size.
  • ●The working set needs more than 32 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●Memory-hungry applications. A memory-optimized family gives more RAM per dollar.
  • ●More than 2.00 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●The work is single-threaded. Most of these 16 vCPU would sit idle.
c6gn.4xlarge runs $505/mo on AWS on-demand. The equivalent on Rackspace Spot: $30/mo.
  • Spot sells spare capacity at market prices. It is the cheapest compute on the internet.
  • Prices are set by supply and demand. You pay what the market decides.
  • Compute is delivered as fully managed Kubernetes. All infrastructure is taken care of.
  • Egress costs $0.01/GB after the free allowance. AWS charges $0.09/GB.
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