Instances›AWS EC2›m7i-flex›m7i-flex.12xlarge
Compute
vCPUs48
Memory192 GiB
Mem / vCPU4.00 GiB
ProcessorXeon Scalable
Clock speed3.5 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth15,000 Mbps
Throughput1875 MB/s
IOPS60,000
Networking
PerformanceUp to 18.75 Gigabit
Max ENIs8
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.12xlarge

The m7i-flex.12xlarge pairs 48 vCPU with 192 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.12xlarge becomes 3 × gp.vs2.2xlarge (48 vCPU, 192 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.12xlarge gives you 48 vCPU and 192 GiB in a single machine. The largest comparable Spot node, gp.vs2.2xlarge, is 16 vCPU and 64 GiB, so the equivalent here is 3 nodes rather than one.

Spot runs as managed Kubernetes, so a 3-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 48 cores and 192 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$2.298$0.733$1.520$1.043$0.123
$2.175 savings
US Central, Chicagono AWS region$0.123
US Central, Dallasno AWS region$0.153
Hong Kong$3.160$2.090$1.433$0.033
$3.127 savings
Sydney, Australia$2.873$0.946$1.900$1.303$0.483
$2.390 savings
London, UK$2.657$0.266$1.755$1.208$0.663
$1.994 savings
US West, San Jose$2.681$0.662$1.768$1.222$0.453
$2.228 savings
US Central, Dallas 2no AWS region$0.003
US East, N. Virginia 2$2.298$0.733$1.520$1.043$0.453
$1.845 savings
When to use it
Good for
  • ●Development, staging and CI environments
  • ●Small to mid-size relational databases
  • ●Backend services with no single dominant resource
  • ●Workloads that fit inside 192 GiB of RAM
  • ●Parallel work that can occupy 48 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 18.75 Gigabit
  • ●Anything that shards cleanly across 3 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●The working set needs more than 192 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 48 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
m7i-flex.12xlarge runs $1,678/mo on AWS on-demand. The 3-node equivalent on Rackspace Spot: $90/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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