Instances›AWS EC2›i8g›i8g.4xlarge
Compute
vCPUs16
Memory128 GiB
Mem / vCPU8.00 GiB
ProcessorGraviton4 Processor
Clock speed2.7 GHz
Architecturearm64
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
i8g.large2 vCPU · 16 GiB
i8g.xlarge4 vCPU · 32 GiB
i8g.2xlarge8 vCPU · 64 GiB
i8g.4xlarge16 vCPU · 128 GiB
i8g.8xlarge32 vCPU · 256 GiB
i8g.12xlarge48 vCPU · 384 GiB
i8g.16xlarge64 vCPU · 512 GiB
i8g.24xlarge96 vCPU · 768 GiB
i8g.metal-24xl96 vCPU · 768 GiB
i8g.48xlarge192 vCPU · 1536 GiB
i8g.metal-48xl192 vCPU · 1536 GiB
i8g.4xlarge

The i8g.4xlarge pairs 16 vCPU with 128 GiB of RAM, the 8.00 GiB-per-vCPU ratio that marks a storage-optimized instance. In the name, "i" is I/O, meaning local storage, "8" is the generation, "g" marks AWS Graviton (ARM) processors and "4xlarge" is the size within the i8g family. It runs on AWS Graviton4 Processor at 2.7 GHz, and AWS introduced it in December 2024. i8g is the current generation of the i family, so there is no newer AWS size to migrate to. mh.vs1.2xlarge on Rackspace Spot lines up one-for-one: 16 vCPU and 128 GiB, $1.37/hr on AWS in US East (N. Virginia), from $0.021/hr on Rackspace Spot.

Match qualityx86 substitution

i8g.4xlarge is Graviton (arm64). Rackspace Spot does not have arm64 servers, so mh.vs1.2xlarge is an x86_64 substitute with similar specs.

You will need x86 builds of your container images. Most software rebuilds without changes, but anything with compiled native code needs a real rebuild rather than a retag. Speed per core also differs between the two chips, so it is worth testing before deciding how many nodes to run.

No local diski8g.4xlarge comes with 1 × 3,750 GB NVMe SSD attached to the machine. Spot nodes use network storage only, so that disk doesn't come with it. If you were using it as fast scratch space, you'd move to a persistent volume or object storage, which are slower to read.
Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$1.373$0.475$0.021
$1.352 savings
US Central, Chicagono AWS region$0.021
US Central, Dallasno AWS region$0.131
Hong Kong$0.021
Sydney, Australia$1.646$0.319$0.021
$1.625 savings
London, UK$1.593$0.338$0.131
$1.462 savings
US West, San Jose$0.002
US Central, Dallas 2no AWS region$0.242
When to use it
Good for
  • ●Elasticsearch and OpenSearch data nodes
  • ●NoSQL stores such as Cassandra, ScyllaDB and MongoDB
  • ●Data warehousing and log processing
  • ●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
  • ●The working set needs more than 128 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●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.
i8g.4xlarge runs $1,002/mo on AWS on-demand. The equivalent on Rackspace Spot: $15/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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