Instances›AWS EC2›m6idn›m6idn.metal
Compute
vCPUs128
Memory512 GiB
Mem / vCPU4.00 GiB
ProcessorXeon 8375C
Clock speed3.5 GHz
Architecturex86_64
Storage
Type4 × 1,900 GB NVMe SSD
Bandwidth100,000 Mbps
Throughput12500 MB/s
IOPS400,000
Networking
Performance200 Gigabit
Max ENIs16
IPv6Yes
GPUNone
Family sizes
m6idn.large2 vCPU · 8 GiB
m6idn.xlarge4 vCPU · 16 GiB
m6idn.2xlarge8 vCPU · 32 GiB
m6idn.4xlarge16 vCPU · 64 GiB
m6idn.8xlarge32 vCPU · 128 GiB
m6idn.12xlarge48 vCPU · 192 GiB
m6idn.16xlarge64 vCPU · 256 GiB
m6idn.24xlarge96 vCPU · 384 GiB
m6idn.32xlarge128 vCPU · 512 GiB
m6idn.metal128 vCPU · 512 GiB
m6idn.metal

The m6idn.metal pairs 128 vCPU with 512 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, "6" is the generation, "idn" marks Intel processors, local NVMe storage and enhanced networking and "metal" is the size within the m6idn family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in March 2023. AWS has since shipped m7i, m8idn and m9g; m7g.metal is the direct replacement at this size. Spot's node ladder tops out below this size, so m6idn.metal becomes 8 × gp.vs2.2xlarge (128 vCPU, 512 GiB combined), $10.18/hr on AWS in US East (N. Virginia), from $0.328/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 qualityVirtualised, not bare metal

m6idn.metal is a full physical server — no virtualisation layer in the way, direct access to the hardware, and a socket count that licensing can verify.

Rackspace Spot no longer sells bare metal; everything in the catalog is a virtual machine. You get the same cores and memory (8 × gp.vs2.2xlarge, 128 vCPU, 512 GiB), but not the dedicated hardware. If you picked m6idn.metal because you needed the real machine — nested virtualisation, per-socket licensing, low-level profiling — this is not a replacement at any price. If you picked it because it is the biggest m6idn, it is the same compute for a lot less.

Runs as a fleetNo single Spot node has 128 vCPU; the largest comparable one has 16. So this runs as 8 nodes. That works if your workload already spreads across machines, and doesn't if one process needs all the cores together.
No local diskm6idn.metal comes with 4 × 1,900 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$10.184$1.018$6.416$3.959$0.328
$9.856 savings
US Central, Chicagono AWS region$0.328
US Central, Dallasno AWS region$0.408
Hong Kong$0.088
Sydney, Australia$12.879$1.288$8.114$5.564$1.288
$11.591 savings
London, UK$11.583$6.221$7.297$4.465$1.768
$9.815 savings
US West, San Jose$11.740$11.740$7.396$4.525$1.208
$10.532 savings
US Central, Dallas 2no AWS region$0.008
US East, N. Virginia 2$10.184$1.018$6.416$3.959$1.208
$8.976 savings
When to use it
Good for
  • ●Web and application servers with mixed CPU and memory demand
  • ●Microservices and container fleets
  • ●Development, staging and CI environments
  • ●Workloads that fit inside 512 GiB of RAM
  • ●Jobs that want 4 × 1,900 GB of local NVMe scratch space
  • ●Network-heavy services — AWS rates this size at 200 Gigabit
  • ●Anything that shards cleanly across 8 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●Starting a new deployment. m7g.metal is the newer generation at this size.
  • ●The working set needs more than 512 GiB of RAM
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●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 128 vCPU would sit idle.
  • ●GPU or FPGA acceleration is needed
m6idn.metal runs $7,434/mo on AWS on-demand. The 8-node equivalent on Rackspace Spot: $239/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.
Build your Cloudspace
Frequently asked questions