Instances›AWS EC2›i4i›i4i.4xlarge
Compute
vCPUs16
Memory128 GiB
Mem / vCPU8.00 GiB
ProcessorXeon 8375C
Clock speed3.5 GHz
Architecturex86_64
Storage
Type1 × 3,750 GB NVMe SSD
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
PerformanceUp to 25 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
i4i.large2 vCPU · 16 GiB
i4i.xlarge4 vCPU · 32 GiB
i4i.2xlarge8 vCPU · 64 GiB
i4i.4xlarge16 vCPU · 128 GiB
i4i.8xlarge32 vCPU · 256 GiB
i4i.12xlarge48 vCPU · 384 GiB
i4i.16xlarge64 vCPU · 512 GiB
i4i.24xlarge96 vCPU · 768 GiB
i4i.32xlarge128 vCPU · 1024 GiB
i4i.metal128 vCPU · 1024 GiB
i4i.4xlarge

The i4i.4xlarge is a storage-optimized AWS EC2 instance: 16 vCPU and 128 GiB of memory, 8.00 GiB per vCPU. In the name, "i" is I/O, meaning local storage, "4" is the generation, "i" marks Intel processors and "4xlarge" is the size within the i4i family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in April 2022. AWS has since shipped i7i and i8g; i7i.4xlarge is the direct replacement at this size, scoring 365,234 CoreMark/s against this instance's 269,270 — roughly 36% more throughput for the same vCPU count. Rackspace Spot's mh.vs1.2xlarge is a like-for-like substitute at 16 vCPU and 128 GiB, $1.37/hr on AWS in US East (N. Virginia), from $0.021/hr on Rackspace Spot.

Match qualityNo local disk

i4i.4xlarge comes with 1 × 3,750 GB NVMe SSD attached to the machine. Rackspace Spot nodes use network storage only, so that disk does not come with it.

If you were using the local disk as fast scratch space — temporary files, a local cache, an index — you will need a persistent volume or object storage instead, and both are slower to read. If it was just extra space you never depended on, nothing changes.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$1.373$0.609$0.891$0.635$0.021
$1.352 savings
US Central, Chicagono AWS region$0.021
US Central, Dallasno AWS region$0.131
Hong Kong$1.813$1.182$0.841$0.021
$1.792 savings
Sydney, Australia$1.646$0.532$1.074$0.762$0.021
$1.625 savings
London, UK$1.593$0.212$1.039$0.735$0.131
$1.462 savings
US West, San Jose$1.514$0.398$0.987$0.699$0.002
$1.512 savings
US Central, Dallas 2no AWS region$0.242
When to use it
Good for
  • ●Transactional databases with heavy random I/O
  • ●Streaming ingest that spools to local disk
  • ●Elasticsearch and OpenSearch data nodes
  • ●Workloads that fit inside 128 GiB of RAM
  • ●Jobs that want 1 × 3,750 GB of local NVMe scratch space
  • ●Network-heavy services — AWS rates this size at Up to 25 Gigabit
Avoid if
  • ●Starting a new deployment. i7i.4xlarge is the newer generation at this size.
  • ●The working set needs more than 128 GiB of RAM
  • ●GPU or FPGA acceleration is needed
  • ●Workloads that never touch local disk. The instance-store premium is wasted.
  • ●More than 8.00 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.
$1,002/mo on AWS on-demand against $15/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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