Instances›AWS EC2›r5b›r5b.large
Compute
vCPUs2
Memory16 GiB
Mem / vCPU8.00 GiB
ProcessorXeon Platinum 8259
Clock speed3.1 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS43,333
Networking
PerformanceUp to 10 Gigabit
Max ENIs3
IPv6Yes
GPUNone
Family sizes
r5b.large2 vCPU · 16 GiB
r5b.xlarge4 vCPU · 32 GiB
r5b.2xlarge8 vCPU · 64 GiB
r5b.4xlarge16 vCPU · 128 GiB
r5b.8xlarge32 vCPU · 256 GiB
r5b.12xlarge48 vCPU · 384 GiB
r5b.16xlarge64 vCPU · 512 GiB
r5b.24xlarge96 vCPU · 768 GiB
r5b.metal96 vCPU · 768 GiB
r5b.large

The r5b.large is a memory-optimized AWS EC2 instance: 2 vCPU and 16 GiB of memory, 8.00 GiB per vCPU. In the name, "r" stands for RAM, "5" is the generation, "b" marks block-storage optimisation and "large" is the size within the r5b family. It runs on Intel Xeon Platinum 8259 (Cascade Lake) at 3.1 GHz, and AWS introduced it in December 2020. AWS has since shipped r6i, r7i, r8i and r9g; r6i.large is the direct replacement at this size. Rackspace Spot's mh.vs1.medium is a like-for-like substitute at 2 vCPU and 16 GiB, about 93% 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$0.149$0.041$0.094$0.060$0.011
$0.138 savings
US Central, Chicagono AWS region$0.021
US Central, Dallasno AWS region$0.041
Hong Kong$0.002
Sydney, Australia$0.181$0.057$0.114$0.073$0.011
$0.170 savings
London, UK$0.175$0.049$0.111$0.074$0.011
$0.164 savings
US West, San Jose$0.031
US Central, Dallas 2no AWS region$0.031
When to use it
Good for
  • ●In-memory caches such as Redis and Memcached
  • ●Large JVM heaps and application servers that hold state
  • ●OLAP and business intelligence query engines
  • ●Workloads that fit inside 16 GiB of RAM
  • ●Small, steady services that do not need more than 2 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 10 Gigabit
Avoid if
  • ●Starting a new deployment. r6i.large is the newer generation at this size.
  • ●The working set needs more than 16 GiB of RAM
  • ●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
  • ●CPU-bound work. You are paying for memory this workload will not use.
r5b.large runs $109/mo on AWS on-demand. The equivalent on Rackspace Spot: $8/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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