Instances›AWS EC2›m6i›m6i.8xlarge
Compute
vCPUs32
Memory128 GiB
Mem / vCPU4.00 GiB
ProcessorXeon 8375C
Clock speed3.5 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
Performance12.5 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
m6i.large2 vCPU · 8 GiB
m6i.xlarge4 vCPU · 16 GiB
m6i.2xlarge8 vCPU · 32 GiB
m6i.4xlarge16 vCPU · 64 GiB
m6i.8xlarge32 vCPU · 128 GiB
m6i.12xlarge48 vCPU · 192 GiB
m6i.16xlarge64 vCPU · 256 GiB
m6i.24xlarge96 vCPU · 384 GiB
m6i.32xlarge128 vCPU · 512 GiB
m6i.metal128 vCPU · 512 GiB
m6i.8xlarge

The m6i.8xlarge is a general-purpose AWS EC2 instance: 32 vCPU and 128 GiB of memory, 4.00 GiB per vCPU. In the name, "m" is the general-purpose line, "6" is the generation, "i" marks Intel processors and "8xlarge" is the size within the m6i family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in August 2021. AWS has since shipped m7i, m8i and m9g; m7i.8xlarge is the direct replacement at this size, scoring 699,530 CoreMark/s against this instance's 550,372 — roughly 27% more throughput for the same vCPU count. No single Spot node covers 32 vCPU and 128 GiB, so the equivalent is a fleet: 2 × gp.vs2.2xlarge, 32 vCPU and 128 GiB in total, about 95% below the US East (N. Virginia) on-demand rate. 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

m6i.8xlarge gives you 32 vCPU and 128 GiB in a single machine. The largest comparable Spot node, gp.vs2.2xlarge, is 16 vCPU and 64 GiB, so the equivalent here is 2 nodes rather than one.

Spot runs as managed Kubernetes, so a 2-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 32 cores and 128 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$1.536$0.497$1.016$0.697$0.082
$1.454 savings
US Central, Chicagono AWS region$0.082
US Central, Dallasno AWS region$0.102
Hong Kong$2.112$1.397$0.958$0.022
$2.090 savings
Sydney, Australia$1.920$0.766$1.270$0.871$0.322
$1.598 savings
London, UK$1.776$0.547$1.173$0.807$0.442
$1.334 savings
US West, San Jose$1.792$0.830$1.182$0.817$0.302
$1.490 savings
US Central, Dallas 2no AWS region$0.002
US East, N. Virginia 2$1.536$0.497$1.016$0.697$0.302
$1.234 savings
When to use it
Good for
  • ●Backend services with no single dominant resource
  • ●Queue workers and scheduled jobs
  • ●Web and application servers with mixed CPU and memory demand
  • ●Workloads that fit inside 128 GiB of RAM
  • ●Parallel work that can occupy 32 vCPU
  • ●Network-heavy services — AWS rates this size at 12.5 Gigabit
  • ●Anything that shards cleanly across 2 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●Starting a new deployment. m7i.8xlarge is the newer generation at this size.
  • ●The working set needs more than 128 GiB of RAM
  • ●Sustained full-core CPU load. A compute-optimized family costs less per unit of work.
  • ●More than 4.00 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●The work is single-threaded. Most of these 32 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
$1,121/mo on AWS on-demand against $60/mo on Rackspace Spot for the 2-node 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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