Instances›AWS EC2›r4›r4.4xlarge
Compute
vCPUs16
Memory122 GiB
Mem / vCPU7.63 GiB
ProcessorXeon E5-2686 v4
Clock speed2.3 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth3,500 Mbps
Throughput437.5 MB/s
IOPS18,750
Networking
PerformanceUp to 10 Gigabit
Max ENIs8
IPv6Yes
GPUNone
Family sizes
r4.large2 vCPU · 15.25 GiB
r4.xlarge4 vCPU · 30.5 GiB
r4.2xlarge8 vCPU · 61 GiB
r4.4xlarge16 vCPU · 122 GiB
r4.8xlarge32 vCPU · 244 GiB
r4.16xlarge64 vCPU · 488 GiB
r4.4xlarge

The r4.4xlarge pairs 16 vCPU with 122 GiB of RAM, the 7.63 GiB-per-vCPU ratio that marks a memory-optimized instance. In the name, "r" stands for RAM, "4" is the generation and "4xlarge" is the size within the r4 family. It runs on Intel Xeon E5-2686 v4 (Broadwell) at 2.3 GHz, and AWS introduced it in November 2016. AWS has since shipped r5, r6i, r7i and r8i; r5.4xlarge is the direct replacement at this size. mh.vs1.2xlarge on Rackspace Spot lines up one-for-one: 16 vCPU and 128 GiB, $1.06/hr on AWS in US East (N. Virginia), from $0.021/hr on Rackspace Spot.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$1.064$0.347$0.672$0.458$0.021
$1.043 savings
US Central, Chicagono AWS region$0.021
US Central, Dallasno AWS region$0.131
Hong Kong$0.021
Sydney, Australia$1.277$0.402$0.806$0.553$0.021
$1.256 savings
London, UK$1.248$0.345$0.790$0.536$0.131
$1.117 savings
US West, San Jose$1.186$0.313$0.748$0.510$0.002
$1.184 savings
US Central, Dallas 2no AWS region$0.242
When to use it
Good for
  • ●Graph and search workloads with large indexes
  • ●In-memory caches such as Redis and Memcached
  • ●Large JVM heaps and application servers that hold state
  • ●Workloads that fit inside 122 GiB of RAM
  • ●Parallel work that can occupy 16 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 10 Gigabit
Avoid if
  • ●Starting a new deployment. r5.4xlarge is the newer generation at this size.
  • ●The working set needs more than 122 GiB of RAM
  • ●More than 7.63 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●The work is single-threaded. Most of these 16 vCPU would sit idle.
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
$777/mo on AWS on-demand against $15/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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