Instances›AWS EC2›r8i-flex›r8i-flex.xlarge
Compute
vCPUs4
Memory32 GiB
Mem / vCPU8.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
PerformanceUp to 12.5 Gigabit
Max ENIs4
IPv6Yes
GPUNone
Family sizes
r8i-flex.large2 vCPU · 16 GiB
r8i-flex.xlarge4 vCPU · 32 GiB
r8i-flex.2xlarge8 vCPU · 64 GiB
r8i-flex.4xlarge16 vCPU · 128 GiB
r8i-flex.8xlarge32 vCPU · 256 GiB
r8i-flex.12xlarge48 vCPU · 384 GiB
r8i-flex.16xlarge64 vCPU · 512 GiB
r8i-flex.xlarge

The r8i-flex.xlarge is a memory-optimized AWS EC2 instance: 4 vCPU and 32 GiB of memory, 8.00 GiB per vCPU. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in August 2025. Rackspace Spot's mh.vs2.large is a like-for-like substitute at 4 vCPU and 32 GiB, about 92% below the US East (N. Virginia) on-demand rate.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$0.264$0.100$0.021
$0.243 savings
US Central, Chicagono AWS region$0.061
US Central, Dallasno AWS region$0.021
Hong Kong$0.006
Sydney, Australia$0.316$0.096$0.006
$0.310 savings
London, UK$0.310$0.089$0.006
$0.304 savings
US West, San Jose$0.293$0.071$0.061
$0.232 savings
US Central, Dallas 2no AWS region$0.061
When to use it
Good for
  • ●Database instances that keep the working set in RAM
  • ●Graph and search workloads with large indexes
  • ●In-memory caches such as Redis and Memcached
  • ●Workloads that fit inside 32 GiB of RAM
  • ●Small, steady services that do not need more than 4 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 12.5 Gigabit
Avoid if
  • ●The working set needs more than 32 GiB of RAM
  • ●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
  • ●Local NVMe or instance-store disk is a hard requirement
r8i-flex.xlarge runs $193/mo on AWS on-demand. The equivalent on Rackspace Spot: $15/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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