Instances›AWS EC2›m8ib›m8ib.12xlarge
Compute
vCPUs48
Memory192 GiB
Mem / vCPU4.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth37,500 Mbps
Throughput4687.5 MB/s
IOPS180,000
Networking
Performance50 Gigabit
Max ENIs12
IPv6Yes
GPUNone
Family sizes
m8ib.large2 vCPU · 8 GiB
m8ib.xlarge4 vCPU · 16 GiB
m8ib.2xlarge8 vCPU · 32 GiB
m8ib.4xlarge16 vCPU · 64 GiB
m8ib.8xlarge32 vCPU · 128 GiB
m8ib.12xlarge48 vCPU · 192 GiB
m8ib.16xlarge64 vCPU · 256 GiB
m8ib.24xlarge96 vCPU · 384 GiB
m8ib.32xlarge128 vCPU · 512 GiB
m8ib.48xlarge192 vCPU · 768 GiB
m8ib.metal-48xl192 vCPU · 768 GiB
m8ib.96xlarge384 vCPU · 1536 GiB
m8ib.metal-96xl384 vCPU · 1536 GiB
m8ib.12xlarge

The m8ib.12xlarge pairs 48 vCPU with 192 GiB of RAM, the 4.00 GiB-per-vCPU ratio that marks a general-purpose instance. In the name, "m" is the general-purpose line, "8" is the generation, "ib" marks Intel processors and block-storage optimisation and "12xlarge" is the size within the m8ib family. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in April 2026. AWS has since shipped m9g; m9g.12xlarge is the direct replacement at this size, scoring 1,757,705 CoreMark/s against this instance's 1,159,607 — roughly 52% more throughput for the same vCPU count. Spot's node ladder tops out below this size, so m8ib.12xlarge becomes 3 × gp.vs2.2xlarge (48 vCPU, 192 GiB combined), $4.01/hr on AWS in US East (N. Virginia), from $0.123/hr on Rackspace Spot. 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

m8ib.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$4.010$1.559$0.123
$3.887 savings
US Central, Chicagono AWS region$0.123
US Central, Dallasno AWS region$0.153
Hong Kong$0.033
Sydney, Australia$0.483
London, UK$0.663
US West, San Jose$0.453
US Central, Dallas 2no AWS region$0.003
US East, N. Virginia 2$4.010$1.559$0.453
$3.557 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 192 GiB of RAM
  • ●Parallel work that can occupy 48 vCPU
  • ●Network-heavy services — AWS rates this size at 50 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
$2,927/mo on AWS on-demand against $90/mo on Rackspace Spot for the 3-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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