Instances›AWS EC2›c6a›c6a.4xlarge
Compute
vCPUs16
Memory32 GiB
Mem / vCPU2.00 GiB
ProcessorEPYC 7R13 Processor
Clock speed3.6 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
PerformanceUp to 12.5 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
c6a.large2 vCPU · 4 GiB
c6a.xlarge4 vCPU · 8 GiB
c6a.2xlarge8 vCPU · 16 GiB
c6a.4xlarge16 vCPU · 32 GiB
c6a.8xlarge32 vCPU · 64 GiB
c6a.12xlarge48 vCPU · 96 GiB
c6a.16xlarge64 vCPU · 128 GiB
c6a.24xlarge96 vCPU · 192 GiB
c6a.32xlarge128 vCPU · 256 GiB
c6a.48xlarge192 vCPU · 384 GiB
c6a.metal192 vCPU · 384 GiB
c6a.4xlarge

The c6a.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, "a" marks AMD processors and "4xlarge" is the size within the c6a family. It runs on AMD EPYC 7R13 Processor at 3.6 GHz, and AWS introduced it in February 2022. AWS has since shipped c7a, c8a and c9g; c7a.4xlarge is the direct replacement at this size, scoring 514,497 CoreMark/s against this instance's 332,450 — roughly 55% 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.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$0.612$0.251$0.405$0.269$0.041
$0.571 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.111
Hong Kong$0.778$0.514$0.353$0.041
$0.737 savings
Sydney, Australia$0.799$0.375$0.528$0.363$0.041
$0.758 savings
London, UK$0.727$0.267$0.480$0.331$0.131
$0.596 savings
US West, San Jose$0.763$0.240$0.504$0.347$0.002
$0.761 savings
US Central, Dallas 2no AWS region$0.122
US East, N. Virginia 2$0.612$0.251$0.405$0.269$0.162
$0.450 savings
When to use it
Good for
  • ●Video encoding and transcoding
  • ●High-traffic web and API serving
  • ●Scientific modelling and simulation
  • ●Workloads that fit inside 32 GiB of RAM
  • ●Parallel work that can occupy 16 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 12.5 Gigabit
Avoid if
  • ●Starting a new deployment. c7a.4xlarge is the newer generation at this size.
  • ●The working set needs more than 32 GiB of RAM
  • ●GPU or FPGA acceleration is needed
  • ●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.
c6a.4xlarge runs $447/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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