Instances›AWS EC2›c8g›c8g.metal-48xl
Compute
vCPUs192
Memory384 GiB
Mem / vCPU2.00 GiB
ProcessorGraviton4 Processor
Clock speed2.7 GHz
Architecturearm64
Storage
TypeEBS only
Bandwidth40,000 Mbps
Throughput5000 MB/s
IOPS240,000
Networking
Performance50 Gigabit
Max ENIs15
IPv6Yes
GPUNone
Family sizes
c8g.medium1 vCPU · 2 GiB
c8g.large2 vCPU · 4 GiB
c8g.xlarge4 vCPU · 8 GiB
c8g.2xlarge8 vCPU · 16 GiB
c8g.4xlarge16 vCPU · 32 GiB
c8g.8xlarge32 vCPU · 64 GiB
c8g.12xlarge48 vCPU · 96 GiB
c8g.16xlarge64 vCPU · 128 GiB
c8g.24xlarge96 vCPU · 192 GiB
c8g.metal-24xl96 vCPU · 192 GiB
c8g.48xlarge192 vCPU · 384 GiB
c8g.metal-48xl192 vCPU · 384 GiB
c8g.metal-48xl

The c8g.metal-48xl pairs 192 vCPU with 384 GiB of RAM, the 2.00 GiB-per-vCPU ratio that marks a compute-optimized instance. In the name, "c" stands for compute, "8" is the generation, "g" marks AWS Graviton (ARM) processors and "metal-48xl" is the size within the c8g family. It runs on AWS Graviton4 Processor at 2.7 GHz, and AWS introduced it in September 2024. AWS has since shipped c9g; c9g.metal-48xl is the direct replacement at this size, scoring 7,056,662 CoreMark/s against this instance's 5,484,931 — roughly 29% more throughput for the same vCPU count. Spot's node ladder tops out below this size, so c8g.metal-48xl becomes 12 × ch.vs1.2xlarge (192 vCPU, 384 GiB combined), about 94% 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

c8g.metal-48xl 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 (12 × ch.vs1.2xlarge, 192 vCPU, 384 GiB), but not the dedicated hardware. If you picked c8g.metal-48xl 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 c8g, it is the same compute for a lot less.

Runs as a fleetNo single Spot node has 192 vCPU; the largest comparable one has 16. So this runs as 12 nodes. That works if your workload already spreads across machines, and doesn't if one process needs all the cores together.
x86_64 onlyc8g.metal-48xl 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$7.657$0.936$5.046$3.365$0.492
$7.165 savings
US Central, Chicagono AWS region$0.132
US Central, Dallasno AWS region$1.332
Hong Kong$9.610$6.425$4.448$0.492
$9.118 savings
Sydney, Australia$9.965$0.997$6.579$4.528$0.492
$9.473 savings
London, UK$9.066$0.907$5.985$4.120$1.572
$7.494 savings
US West, San Jose$9.515$0.952$6.284$4.327$0.024
$9.492 savings
US Central, Dallas 2no AWS region$1.464
US East, N. Virginia 2$7.657$0.936$5.046$3.365$1.944
$5.713 savings
When to use it
Good for
  • ●Ad serving and real-time bidding
  • ●Game servers and matchmaking
  • ●Batch processing and CI/CD runners
  • ●Workloads that fit inside 384 GiB of RAM
  • ●Parallel work that can occupy 192 vCPU
  • ●Network-heavy services — AWS rates this size at 50 Gigabit
  • ●Anything that shards cleanly across 12 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●The working set needs more than 384 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●GPU or FPGA acceleration is needed
  • ●Memory-hungry applications. A memory-optimized family gives more RAM per dollar.
  • ●More than 2.00 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
$5,590/mo on AWS on-demand against $359/mo on Rackspace Spot for the 12-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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