Instances›AWS EC2›x8g›x8g.metal-48xl
Compute
vCPUs192
Memory3072 GiB
Mem / vCPU16.00 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
x8g.medium1 vCPU · 16 GiB
x8g.large2 vCPU · 32 GiB
x8g.xlarge4 vCPU · 64 GiB
x8g.2xlarge8 vCPU · 128 GiB
x8g.4xlarge16 vCPU · 256 GiB
x8g.8xlarge32 vCPU · 512 GiB
x8g.12xlarge48 vCPU · 768 GiB
x8g.16xlarge64 vCPU · 1024 GiB
x8g.24xlarge96 vCPU · 1536 GiB
x8g.metal-24xl96 vCPU · 1536 GiB
x8g.48xlarge192 vCPU · 3072 GiB
x8g.metal-48xl192 vCPU · 3072 GiB
x8g.metal-48xl

The x8g.metal-48xl is a memory-optimized AWS EC2 instance: 192 vCPU and 3072 GiB of memory, 16.00 GiB per vCPU. In the name, "x" is the extra-memory line, "8" is the generation, "g" marks AWS Graviton (ARM) processors and "metal-48xl" is the size within the x8g family. It runs on AWS Graviton4 Processor at 2.7 GHz, and AWS introduced it in September 2024. x8g is the current generation of the x family, so there is no newer AWS size to migrate to. Spot's largest VM is 16 vCPU and 128 GiB, so matching this instance would take 22 × mh.vs1.2xlarge — arithmetically true and operationally absurd. The Spot column below prices that whole fleet, so read it as a scale reference rather than a drop-in replacement: at this size the useful question is what a shard of the workload costs, which is $0.021/hr per node.

Match qualityVirtualised, not bare metal

x8g.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 (22 × mh.vs1.2xlarge, 352 vCPU, 2,816 GiB), but not the dedicated hardware. If you picked x8g.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 x8g, it is the same compute for a lot less.

x86_64 onlyx8g.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$18.758$2.448$11.560$6.408$0.462
$18.296 savings
US Central, Chicagono AWS region$0.462
US Central, Dallasno AWS region$2.882
Hong Kong$0.462
Sydney, Australia$22.510$2.251$13.872$7.689$0.462
$22.048 savings
London, UK$2.882
US West, San Jose$0.044
US Central, Dallas 2no AWS region$5.324
When to use it
Good for
  • ●Real-time analytics over hot datasets
  • ●Database instances that keep the working set in RAM
  • ●Graph and search workloads with large indexes
  • ●Workloads that fit inside 3072 GiB of RAM
  • ●Parallel work that can occupy 192 vCPU
  • ●Network-heavy services — AWS rates this size at 50 Gigabit
Avoid if
  • ●The working set needs more than 3072 GiB of RAM
  • ●You cannot rebuild x86-only binaries or vendor images for aarch64
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●You want a single-machine Spot equivalent. At this size there is not one.
  • ●The work is single-threaded. Most of these 192 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
x8g.metal-48xl is $13,694/mo on AWS on-demand. A mh.vs1.2xlarge node on Rackspace Spot is $15/mo — at this size the per-node price is the honest comparison.
  • 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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