Instances›AWS EC2›m6g›m6g.metal
Compute
vCPUs64
Memory256 GiB
Mem / vCPU4.00 GiB
ProcessorGraviton2 Processor
Clock speed2.5 GHz
Architecturearm64
Storage
TypeEBS only
Bandwidth19,000 Mbps
Throughput2375 MB/s
IOPS80,000
Networking
Performance25 Gigabit
Max ENIs15
IPv6Yes
GPUNone
Family sizes
m6g.medium1 vCPU · 4 GiB
m6g.large2 vCPU · 8 GiB
m6g.xlarge4 vCPU · 16 GiB
m6g.2xlarge8 vCPU · 32 GiB
m6g.4xlarge16 vCPU · 64 GiB
m6g.8xlarge32 vCPU · 128 GiB
m6g.12xlarge48 vCPU · 192 GiB
m6g.16xlarge64 vCPU · 256 GiB
m6g.metal64 vCPU · 256 GiB
m6g.metal

The m6g.metal pairs 64 vCPU with 256 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, "g" marks AWS Graviton (ARM) processors and "metal" is the size within the m6g family. It runs on AWS Graviton2 Processor at 2.5 GHz, and AWS introduced it in May 2020. AWS has since shipped m7g, m8g and m9g; m7g.metal is the direct replacement at this size, scoring 1,729,262 CoreMark/s against this instance's 1,280,256 — roughly 35% more throughput for the same vCPU count. Spot's node ladder tops out below this size, so m6g.metal becomes 4 × gp.vs2.2xlarge (64 vCPU, 256 GiB combined), about 93% 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 qualityVirtualised, not bare metal

m6g.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 (4 × gp.vs2.2xlarge, 64 vCPU, 256 GiB), but not the dedicated hardware. If you picked m6g.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 m6g, it is the same compute for a lot less.

Runs as a fleetNo single Spot node has 64 vCPU; the largest comparable one has 16. So this runs as 4 nodes. That works if your workload already spreads across machines, and doesn't if one process needs all the cores together.
x86_64 onlym6g.metal is Graviton (arm64) and Rackspace Spot has no arm64 nodes, so you'd be moving to x86. You'll need x86 builds of your images, and per-core speed differs between the chips — worth testing before you decide how many nodes to run.
Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$2.464$0.651$1.546$1.071$0.164
$2.300 savings
US Central, Chicagono AWS region$0.164
US Central, Dallasno AWS region$0.204
Hong Kong$3.392$2.117$1.451$0.044
$3.348 savings
Sydney, Australia$3.072$0.493$1.935$1.327$0.644
$2.428 savings
London, UK$2.842$0.405$1.790$1.228$0.884
$1.958 savings
US West, San Jose$2.867$0.369$1.806$1.239$0.604
$2.263 savings
US Central, Dallas 2no AWS region$0.004
US East, N. Virginia 2$2.464$0.651$1.546$1.071$0.604
$1.860 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 25 Gigabit
  • ●Anything that shards cleanly across 4 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 256 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●The work is single-threaded. Most of these 64 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
$1,799/mo on AWS on-demand against $120/mo on Rackspace Spot for the 4-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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