Instances›AWS EC2›c8ib›c8ib.4xlarge
Compute
vCPUs16
Memory32 GiB
Mem / vCPU2.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth25,000 Mbps
Throughput3125 MB/s
IOPS120,000
Networking
PerformanceUp to 33.33 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
c8ib.large2 vCPU · 4 GiB
c8ib.xlarge4 vCPU · 8 GiB
c8ib.2xlarge8 vCPU · 16 GiB
c8ib.4xlarge16 vCPU · 32 GiB
c8ib.8xlarge32 vCPU · 64 GiB
c8ib.12xlarge48 vCPU · 96 GiB
c8ib.16xlarge64 vCPU · 128 GiB
c8ib.24xlarge96 vCPU · 192 GiB
c8ib.32xlarge128 vCPU · 256 GiB
c8ib.48xlarge192 vCPU · 384 GiB
c8ib.metal-48xl192 vCPU · 384 GiB
c8ib.96xlarge384 vCPU · 768 GiB
c8ib.metal-96xl384 vCPU · 768 GiB
c8ib.4xlarge

c8ib.4xlarge is AWS's compute-optimized EC2 size at 16 vCPU and 32 GiB. In the name, "c" stands for compute, "8" is the generation, "ib" marks Intel processors and block-storage optimisation and "4xlarge" is the size within the c8ib family. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in April 2026. AWS has since shipped c9g; c9g.4xlarge is the direct replacement at this size. On Rackspace Spot the same shape is ch.vs1.2xlarge — 16 vCPU, 32 GiB, matched on both dimensions, $1.09/hr on AWS in US East (N. Virginia), from $0.041/hr on Rackspace Spot.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$1.089$0.470$0.041
$1.048 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.111
Hong Kong$0.041
Sydney, Australia$0.041
London, UK$0.131
US West, San Jose$0.002
US Central, Dallas 2no AWS region$0.122
US East, N. Virginia 2$1.089$0.470$0.162
$0.927 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 33.33 Gigabit
Avoid if
  • ●The working set needs more than 32 GiB of RAM
  • ●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.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
  • ●Memory-hungry applications. A memory-optimized family gives more RAM per dollar.
Stop overpaying AWS. This compute costs $795/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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