Instances›AWS EC2›m7i-flex›m7i-flex.16xlarge
Compute
vCPUs64
Memory256 GiB
Mem / vCPU4.00 GiB
ProcessorXeon Scalable
Clock speed3.5 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth20,000 Mbps
Throughput2500 MB/s
IOPS80,000
Networking
PerformanceUp to 25 Gigabit
Max ENIs15
IPv6Yes
GPUNone
Family sizes
m7i-flex.large2 vCPU · 8 GiB
m7i-flex.xlarge4 vCPU · 16 GiB
m7i-flex.2xlarge8 vCPU · 32 GiB
m7i-flex.4xlarge16 vCPU · 64 GiB
m7i-flex.8xlarge32 vCPU · 128 GiB
m7i-flex.12xlarge48 vCPU · 192 GiB
m7i-flex.16xlarge64 vCPU · 256 GiB
m7i-flex.16xlarge

The m7i-flex.16xlarge pairs 64 vCPU with 256 GiB of RAM, the 4.00 GiB-per-vCPU ratio that marks a general-purpose instance. It runs on Intel Xeon Scalable (Sapphire Rapids) at 3.5 GHz, and AWS introduced it in January 2025. Spot's node ladder tops out below this size, so m7i-flex.16xlarge becomes 4 × gp.vs2.2xlarge (64 vCPU, 256 GiB combined), 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

m7i-flex.16xlarge gives you 64 vCPU and 256 GiB in a single machine. The largest comparable Spot node, gp.vs2.2xlarge, is 16 vCPU and 64 GiB, so the equivalent here is 4 nodes rather than one.

Spot runs as managed Kubernetes, so a 4-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 64 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$3.064$0.876$2.027$1.390$0.164
$2.900 savings
US Central, Chicagono AWS region$0.164
US Central, Dallasno AWS region$0.204
Hong Kong$4.213$2.787$1.911$0.044
$4.169 savings
Sydney, Australia$3.830$1.188$2.534$1.738$0.644
$3.186 savings
London, UK$3.543$0.354$2.340$1.611$0.884
$2.659 savings
US West, San Jose$3.575$0.709$2.358$1.629$0.604
$2.971 savings
US Central, Dallas 2no AWS region$0.004
US East, N. Virginia 2$3.064$0.876$2.027$1.390$0.604
$2.460 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 256 GiB of RAM
  • ●Parallel work that can occupy 64 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 25 Gigabit
  • ●Anything that shards cleanly across 4 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●The working set needs more than 256 GiB of RAM
  • ●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 64 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
  • ●Sustained full-core CPU load. A compute-optimized family costs less per unit of work.
Stop overpaying AWS. This compute costs $2,237/mo on AWS vs $120/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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