Instances›AWS EC2›c6i›c6i.4xlarge
Compute
vCPUs16
Memory32 GiB
Mem / vCPU2.00 GiB
ProcessorXeon 8375C
Clock speed3.5 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
c6i.large2 vCPU · 4 GiB
c6i.xlarge4 vCPU · 8 GiB
c6i.2xlarge8 vCPU · 16 GiB
c6i.4xlarge16 vCPU · 32 GiB
c6i.8xlarge32 vCPU · 64 GiB
c6i.12xlarge48 vCPU · 96 GiB
c6i.16xlarge64 vCPU · 128 GiB
c6i.24xlarge96 vCPU · 192 GiB
c6i.32xlarge128 vCPU · 256 GiB
c6i.metal128 vCPU · 256 GiB
c6i.4xlarge

c6i.4xlarge is AWS's compute-optimized EC2 size at 16 vCPU and 32 GiB. In the name, "c" stands for compute, "6" is the generation, "i" marks Intel processors and "4xlarge" is the size within the c6i family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in October 2021. AWS has since shipped c7i, c8i and c9g; c7i.4xlarge is the direct replacement at this size, scoring 382,775 CoreMark/s against this instance's 276,865 — roughly 38% more throughput for the same vCPU count. On Rackspace Spot the same shape is ch.vs1.2xlarge — 16 vCPU, 32 GiB, matched on both dimensions, about 94% 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$0.680$0.436$0.450$0.299$0.041
$0.639 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.111
Hong Kong$0.864$0.572$0.392$0.041
$0.823 savings
Sydney, Australia$0.888$0.339$0.586$0.404$0.041
$0.847 savings
London, UK$0.808$0.269$0.533$0.367$0.131
$0.677 savings
US West, San Jose$0.848$0.280$0.560$0.386$0.002
$0.846 savings
US Central, Dallas 2no AWS region$0.122
US East, N. Virginia 2$0.680$0.436$0.450$0.299$0.162
$0.518 savings
When to use it
Good for
  • ●High-traffic web and API serving
  • ●Scientific modelling and simulation
  • ●Ad serving and real-time bidding
  • ●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. c7i.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.
Stop overpaying AWS. This compute costs $496/mo on AWS vs $30/mo on Rackspace Spot.
  • 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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