Instances›AWS EC2›c6g›c6g.metal
Compute
vCPUs64
Memory128 GiB
Mem / vCPU2.00 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
c6g.medium1 vCPU · 2 GiB
c6g.large2 vCPU · 4 GiB
c6g.xlarge4 vCPU · 8 GiB
c6g.2xlarge8 vCPU · 16 GiB
c6g.4xlarge16 vCPU · 32 GiB
c6g.8xlarge32 vCPU · 64 GiB
c6g.12xlarge48 vCPU · 96 GiB
c6g.16xlarge64 vCPU · 128 GiB
c6g.metal64 vCPU · 128 GiB
c6g.metal

The c6g.metal is a compute-optimized AWS EC2 instance: 64 vCPU and 128 GiB of memory, 2.00 GiB per vCPU. In the name, "c" stands for compute, "6" is the generation, "g" marks AWS Graviton (ARM) processors and "metal" is the size within the c6g family. It runs on AWS Graviton2 Processor at 2.5 GHz, and AWS introduced it in June 2020. AWS has since shipped c7g, c8g and c9g; c7g.metal is the direct replacement at this size, scoring 1,533,853 CoreMark/s against this instance's 1,258,769 — roughly 22% more throughput for the same vCPU count. No single Spot node covers 64 vCPU and 128 GiB, so the equivalent is a fleet: 4 × ch.vs1.2xlarge, 64 vCPU and 128 GiB in total, about 92% 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

c6g.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 × ch.vs1.2xlarge, 64 vCPU, 128 GiB), but not the dedicated hardware. If you picked c6g.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 c6g, 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 onlyc6g.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$2.176$0.615$1.371$0.940$0.164
$2.012 savings
US Central, Chicagono AWS region$0.044
US Central, Dallasno AWS region$0.444
Hong Kong$2.752$1.747$1.210$0.164
$2.588 savings
Sydney, Australia$2.842$0.526$1.790$1.228$0.164
$2.678 savings
London, UK$2.586$0.338$1.629$1.117$0.524
$2.062 savings
US West, San Jose$2.714$0.271$1.710$1.172$0.008
$2.706 savings
US Central, Dallas 2no AWS region$0.488
US East, N. Virginia 2$2.176$0.615$1.371$0.940$0.648
$1.528 savings
When to use it
Good for
  • ●Scientific modelling and simulation
  • ●Ad serving and real-time bidding
  • ●Game servers and matchmaking
  • ●Workloads that fit inside 128 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. c7g.metal is the newer generation at this size.
  • ●The working set needs more than 128 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●More than 2.00 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.
Stop overpaying AWS. This compute costs $1,588/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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