Instances›AWS EC2›r8i-flex›r8i-flex.2xlarge
Compute
vCPUs8
Memory64 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 15 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.2xlarge

r8i-flex.2xlarge is AWS's memory-optimized EC2 size at 8 vCPU and 64 GiB. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in August 2025. On Rackspace Spot the same shape is mh.vs2.xlarge — 8 vCPU, 64 GiB, matched on both dimensions, about 94% 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$0.528$0.195$0.031
$0.497 savings
US Central, Chicagono AWS region$0.011
US Central, Dallasno AWS region$0.081
Hong Kong$0.011
Sydney, Australia$0.633$0.153$0.131
$0.502 savings
London, UK$0.620$0.190$0.041
$0.579 savings
US West, San Jose$0.587$0.165$0.001
$0.586 savings
US Central, Dallas 2no AWS region$0.121
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 64 GiB of RAM
  • ●Parallel work that can occupy 8 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 15 Gigabit
Avoid if
  • ●The working set needs more than 64 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
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
$385/mo on AWS on-demand against $23/mo on Rackspace Spot for the equivalent — market-priced, not list-priced.
  • 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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