Instances›AWS EC2›r8ib›r8ib.metal-48xl
Compute
vCPUs192
Memory1536 GiB
Mem / vCPU8.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth150,000 Mbps
Throughput18750 MB/s
IOPS720,000
Networking
Performance200 Gigabit
Max ENIs24
IPv6Yes
GPUNone
Family sizes
r8ib.large2 vCPU · 16 GiB
r8ib.xlarge4 vCPU · 32 GiB
r8ib.2xlarge8 vCPU · 64 GiB
r8ib.4xlarge16 vCPU · 128 GiB
r8ib.8xlarge32 vCPU · 256 GiB
r8ib.12xlarge48 vCPU · 384 GiB
r8ib.16xlarge64 vCPU · 512 GiB
r8ib.24xlarge96 vCPU · 768 GiB
r8ib.32xlarge128 vCPU · 1024 GiB
r8ib.48xlarge192 vCPU · 1536 GiB
r8ib.metal-48xl192 vCPU · 1536 GiB
r8ib.96xlarge384 vCPU · 3072 GiB
r8ib.metal-96xl384 vCPU · 3072 GiB
r8ib.metal-48xl

The r8ib.metal-48xl is a memory-optimized AWS EC2 instance: 192 vCPU and 1536 GiB of memory, 8.00 GiB per vCPU. In the name, "r" stands for RAM, "8" is the generation, "ib" marks Intel processors and block-storage optimisation and "metal-48xl" is the size within the r8ib family. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in June 2026. AWS has since shipped r9g; r9g.metal-48xl is the direct replacement at this size. No single Spot node covers 192 vCPU and 1536 GiB, so the equivalent is a fleet: 12 × mh.vs1.2xlarge, 192 vCPU and 1536 GiB in total, $20.08/hr on AWS in US East (N. Virginia), from $0.252/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 qualityScale-out match

r8ib.metal-48xl gives you 192 vCPU and 1,536 GiB in a single machine. The largest comparable Spot node, mh.vs1.2xlarge, is 16 vCPU and 128 GiB, so the equivalent here is 12 nodes rather than one.

Spot runs as managed Kubernetes, so a 12-node pool is the normal way to run things rather than a workaround. If your workload already sits behind a load balancer, a queue or a scheduler, it spreads across them without changes. If it needs all 192 cores and 1,536 GiB in one process, it does not.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$20.083$2.447$0.252
$19.831 savings
US Central, Chicagono AWS region$0.252
US Central, Dallasno AWS region$1.572
Hong Kong$0.252
Sydney, Australia$0.252
London, UK$1.572
US West, San Jose$0.024
US Central, Dallas 2no AWS region$2.904
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 1536 GiB of RAM
  • ●Parallel work that can occupy 192 vCPU
  • ●Network-heavy services — AWS rates this size at 200 Gigabit
  • ●Anything that shards cleanly across 12 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●The working set needs more than 1536 GiB of RAM
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
  • ●CPU-bound work. You are paying for memory this workload will not use.
  • ●More than 8.00 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●The work is single-threaded. Most of these 192 vCPU would sit idle.
r8ib.metal-48xl runs $14,661/mo on AWS on-demand. The 12-node equivalent on Rackspace Spot: $184/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.
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