Instances›AWS EC2›c6gd›c6gd.4xlarge
Compute
vCPUs16
Memory32 GiB
Mem / vCPU2.00 GiB
ProcessorGraviton2 Processor
Clock speed2.5 GHz
Architecturearm64
Storage
Type1 × 950 GB NVMe SSD
Bandwidth4,750 Mbps
Throughput593.75 MB/s
IOPS20,000
Networking
PerformanceUp to 10 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
c6gd.medium1 vCPU · 2 GiB
c6gd.large2 vCPU · 4 GiB
c6gd.xlarge4 vCPU · 8 GiB
c6gd.2xlarge8 vCPU · 16 GiB
c6gd.4xlarge16 vCPU · 32 GiB
c6gd.8xlarge32 vCPU · 64 GiB
c6gd.12xlarge48 vCPU · 96 GiB
c6gd.16xlarge64 vCPU · 128 GiB
c6gd.metal64 vCPU · 128 GiB
c6gd.4xlarge

The c6gd.4xlarge pairs 16 vCPU with 32 GiB of RAM, the 2.00 GiB-per-vCPU ratio that marks a compute-optimized instance. In the name, "c" stands for compute, "6" is the generation, "gd" marks AWS Graviton (ARM) processors and local NVMe storage and "4xlarge" is the size within the c6gd family. It runs on AWS Graviton2 Processor at 2.5 GHz, and AWS introduced it in July 2020. AWS has since shipped c7gd, c8gd and c9gd; c7gd.4xlarge is the direct replacement at this size, scoring 402,162 CoreMark/s against this instance's 311,425 — roughly 29% more throughput for the same vCPU count. ch.vs1.2xlarge on Rackspace Spot lines up one-for-one: 16 vCPU and 32 GiB, about 93% below the US East (N. Virginia) on-demand rate.

Match qualityx86 substitution

c6gd.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.

No local diskc6gd.4xlarge comes with 1 × 950 GB NVMe SSD attached to the machine. Spot nodes use network storage only, so that disk doesn't come with it. If you were using it as fast scratch space, you'd move to a persistent volume or object storage, which are slower to read.
Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$0.614$0.198$0.387$0.265$0.041
$0.573 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.111
Hong Kong$0.041
Sydney, Australia$0.808$0.255$0.504$0.346$0.041
$0.767 savings
London, UK$0.736$0.144$0.464$0.318$0.131
$0.605 savings
US West, San Jose$0.768$0.279$0.487$0.328$0.002
$0.766 savings
US Central, Dallas 2no AWS region$0.122
US East, N. Virginia 2$0.614$0.198$0.387$0.265$0.162
$0.452 savings
When to use it
Good for
  • ●Game servers and matchmaking
  • ●Batch processing and CI/CD runners
  • ●Video encoding and transcoding
  • ●Workloads that fit inside 32 GiB of RAM
  • ●Jobs that want 1 × 950 GB of local NVMe scratch space
  • ●Network-heavy services — AWS rates this size at Up to 10 Gigabit
Avoid if
  • ●Starting a new deployment. c7gd.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
  • ●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.
  • ●GPU or FPGA acceleration is needed
$449/mo on AWS on-demand against $30/mo on Rackspace Spot for the equivalent — market-priced, not list-priced.
  • 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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