Instances›AWS EC2›c8ib›c8ib.32xlarge
Compute
vCPUs128
Memory256 GiB
Mem / vCPU2.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth100,000 Mbps
Throughput12500 MB/s
IOPS480,000
Networking
Performance133.33 Gigabit
Max ENIs16
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.32xlarge

The c8ib.32xlarge is a compute-optimized AWS EC2 instance: 128 vCPU and 256 GiB of memory, 2.00 GiB per vCPU. In the name, "c" stands for compute, "8" is the generation, "ib" marks Intel processors and block-storage optimisation and "32xlarge" 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. No single Spot node covers 128 vCPU and 256 GiB, so the equivalent is a fleet: 8 × ch.vs1.2xlarge, 128 vCPU and 256 GiB in total, $8.71/hr on AWS in US East (N. Virginia), from $0.328/hr on Rackspace Spot. Spot delivers compute as managed Kubernetes, so a node pool of that size is the native shape of the answer rather than a workaround — provided the workload scales horizontally.

Match qualityScale-out match

c8ib.32xlarge gives you 128 vCPU and 256 GiB in a single machine. The largest comparable Spot node, ch.vs1.2xlarge, is 16 vCPU and 32 GiB, so the equivalent here is 8 nodes rather than one.

Spot runs as managed Kubernetes, so a 8-node pool is the normal way to run things rather than a workaround. If your workload already sits behind a load balancer, a queue or a scheduler, it spreads across them without changes. If it needs all 128 cores and 256 GiB in one process, it does not.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$8.709$3.037$0.328
$8.381 savings
US Central, Chicagono AWS region$0.088
US Central, Dallasno AWS region$0.888
Hong Kong$0.328
Sydney, Australia$0.328
London, UK$1.048
US West, San Jose$0.016
US Central, Dallas 2no AWS region$0.976
US East, N. Virginia 2$8.709$3.037$1.296
$7.413 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 256 GiB of RAM
  • ●Parallel work that can occupy 128 vCPU
  • ●Network-heavy services — AWS rates this size at 133.33 Gigabit
  • ●Anything that shards cleanly across 8 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●The working set needs more than 256 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 128 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
Stop overpaying AWS. This compute costs $6,358/mo on AWS vs $239/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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