Instances›AWS EC2›r6i›r6i.8xlarge
Compute
vCPUs32
Memory256 GiB
Mem / vCPU8.00 GiB
ProcessorXeon 8375C
Clock speed3.5 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
Performance12.5 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
r6i.large2 vCPU · 16 GiB
r6i.xlarge4 vCPU · 32 GiB
r6i.2xlarge8 vCPU · 64 GiB
r6i.4xlarge16 vCPU · 128 GiB
r6i.8xlarge32 vCPU · 256 GiB
r6i.12xlarge48 vCPU · 384 GiB
r6i.16xlarge64 vCPU · 512 GiB
r6i.24xlarge96 vCPU · 768 GiB
r6i.32xlarge128 vCPU · 1024 GiB
r6i.metal128 vCPU · 1024 GiB
r6i.8xlarge

The r6i.8xlarge is a memory-optimized AWS EC2 instance: 32 vCPU and 256 GiB of memory, 8.00 GiB per vCPU. In the name, "r" stands for RAM, "6" is the generation, "i" marks Intel processors and "8xlarge" is the size within the r6i family. It runs on Intel Xeon 8375C (Ice Lake) at 3.5 GHz, and AWS introduced it in November 2021. AWS has since shipped r7i, r8i and r9g; r7i.8xlarge is the direct replacement at this size, scoring 763,359 CoreMark/s against this instance's 547,219 — roughly 39% more throughput for the same vCPU count. No single Spot node covers 32 vCPU and 256 GiB, so the equivalent is a fleet: 2 × mh.vs1.2xlarge, 32 vCPU and 256 GiB in total, $2.02/hr on AWS in US East (N. Virginia), from $0.042/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

r6i.8xlarge gives you 32 vCPU and 256 GiB in a single machine. The largest comparable Spot node, mh.vs1.2xlarge, is 16 vCPU and 128 GiB, so the equivalent here is 2 nodes rather than one.

Spot runs as managed Kubernetes, so a 2-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 32 cores and 256 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$2.016$1.068$1.334$0.914$0.042
$1.974 savings
US Central, Chicagono AWS region$0.042
US Central, Dallasno AWS region$0.262
Hong Kong$2.672$1.683$1.154$0.042
$2.630 savings
Sydney, Australia$2.416$0.929$1.596$1.098$0.042
$2.374 savings
London, UK$2.368$0.764$1.570$1.071$0.262
$2.106 savings
US West, San Jose$2.240$0.832$1.482$1.016$0.004
$2.236 savings
US Central, Dallas 2no AWS region$0.484
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 256 GiB of RAM
  • ●Parallel work that can occupy 32 vCPU
  • ●Network-heavy services — AWS rates this size at 12.5 Gigabit
  • ●Anything that shards cleanly across 2 nodes, which is how it maps onto Rackspace Spot
Avoid if
  • ●Starting a new deployment. r7i.8xlarge is the newer generation at this size.
  • ●The working set needs more than 256 GiB of RAM
  • ●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 32 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
r6i.8xlarge runs $1,472/mo on AWS on-demand. The 2-node equivalent on Rackspace Spot: $31/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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