Instances›AWS EC2›r6i›r6i.4xlarge
Compute
vCPUs16
Memory128 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
PerformanceUp to 12.5 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.4xlarge

The r6i.4xlarge pairs 16 vCPU with 128 GiB of RAM, the 8.00 GiB-per-vCPU ratio that marks a memory-optimized instance. In the name, "r" stands for RAM, "6" is the generation, "i" marks Intel processors and "4xlarge" 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.4xlarge is the direct replacement at this size, scoring 374,036 CoreMark/s against this instance's 267,525 — roughly 40% more throughput for the same vCPU count. mh.vs1.2xlarge on Rackspace Spot lines up one-for-one: 16 vCPU and 128 GiB, $1.01/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$1.008$0.355$0.667$0.457$0.021
$0.987 savings
US Central, Chicagono AWS region$0.021
US Central, Dallasno AWS region$0.131
Hong Kong$1.336$0.842$0.577$0.021
$1.315 savings
Sydney, Australia$1.208$0.476$0.798$0.549$0.021
$1.187 savings
London, UK$1.184$0.361$0.785$0.535$0.131
$1.053 savings
US West, San Jose$1.120$0.304$0.741$0.508$0.002
$1.118 savings
US Central, Dallas 2no AWS region$0.242
When to use it
Good for
  • ●OLAP and business intelligence query engines
  • ●Real-time analytics over hot datasets
  • ●Database instances that keep the working set in RAM
  • ●Workloads that fit inside 128 GiB of RAM
  • ●Parallel work that can occupy 16 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 12.5 Gigabit
Avoid if
  • ●Starting a new deployment. r7i.4xlarge is the newer generation at this size.
  • ●The working set needs more than 128 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
  • ●The work is single-threaded. Most of these 16 vCPU would sit idle.
r6i.4xlarge runs $736/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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