Instances›AWS EC2›r6in›r6in.metal
Compute
vCPUs128
Memory1024 GiB
Mem / vCPU8.00 GiB
ProcessorXeon 8375C
Clock speed3.5 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth100,000 Mbps
Throughput12500 MB/s
IOPS400,000
Networking
Performance200 Gigabit
Max ENIs16
IPv6Yes
GPUNone
Family sizes
r6in.large2 vCPU · 16 GiB
r6in.xlarge4 vCPU · 32 GiB
r6in.2xlarge8 vCPU · 64 GiB
r6in.4xlarge16 vCPU · 128 GiB
r6in.8xlarge32 vCPU · 256 GiB
r6in.12xlarge48 vCPU · 384 GiB
r6in.16xlarge64 vCPU · 512 GiB
r6in.24xlarge96 vCPU · 768 GiB
r6in.32xlarge128 vCPU · 1024 GiB
r6in.metal128 vCPU · 1024 GiB
r6in.metal

The r6in.metal is a memory-optimized AWS EC2 instance: 128 vCPU and 1024 GiB of memory, 8.00 GiB per vCPU. In the name, "r" stands for RAM, "6" is the generation, "in" marks Intel processors and enhanced networking and "metal" is the size within the r6in family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in March 2023. AWS has since shipped r7i, r8in and r9g; r7g.metal is the direct replacement at this size. No single Spot node covers 128 vCPU and 1024 GiB, so the equivalent is a fleet: 8 × mh.vs1.2xlarge, 128 vCPU and 1024 GiB in total, $11.16/hr on AWS in US East (N. Virginia), from $0.168/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 qualityVirtualised, not bare metal

r6in.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 (8 × mh.vs1.2xlarge, 128 vCPU, 1,024 GiB), but not the dedicated hardware. If you picked r6in.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 r6in, it is the same compute for a lot less.

Runs as a fleetNo single Spot node has 128 vCPU; the largest comparable one has 16. So this runs as 8 nodes. That works if your workload already spreads across machines, and doesn't if one process needs all the cores together.
Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$11.157$1.116$7.029$4.517$0.168
$10.989 savings
US Central, Chicagono AWS region$0.168
US Central, Dallasno AWS region$1.048
Hong Kong$0.168
Sydney, Australia$13.553$1.355$8.539$5.488$0.168
$13.385 savings
London, UK$1.048
US West, San Jose$0.016
US Central, Dallas 2no AWS region$1.936
When to use it
Good for
  • ●Large JVM heaps and application servers that hold state
  • ●OLAP and business intelligence query engines
  • ●Real-time analytics over hot datasets
  • ●Workloads that fit inside 1024 GiB of RAM
  • ●Parallel work that can occupy 128 vCPU
  • ●Network-heavy services — AWS rates this size at 200 Gigabit
  • ●Anything that shards cleanly across 8 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●Starting a new deployment. r7g.metal is the newer generation at this size.
  • ●The working set needs more than 1024 GiB of RAM
  • ●You need dedicated hardware. Rackspace Spot sells virtualised compute only.
  • ●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.
Stop overpaying AWS. This compute costs $8,145/mo on AWS vs $123/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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