r8idn.4xlarge as an EKS node
16 vCPU128 GiBx86_64Intel Xeon Scalable (Granite Rapids)AWS us-east-1R8IDN Quadruple Extra Large
Where the r8idn.4xlarge goes
Default EKS setup: EKS, VPC CNI default (ENI limit).
CPU15.69 of 16 vCPU left for your pods
Memory123.13 GiB of 128 GiB left for your pods
your podsDaemonSets (200m, 300 MiB assumed)kubelet reservedeviction
394max pods per node
$1,369.30on demand / month · $1.88/h
$717.13spot / month (varies)
r8idn.4xlarge EKS max pods and allocatable memory — quick answers
- How many pods can a r8idn.4xlarge run as a node with EKS, VPC CNI default (ENI limit)? Up to 394; kubelet keeps 4689 MiB of memory and 110m CPU, leaving 123.42 GiB and 15.89 vCPU for pods.
- How many pods can a r8idn.4xlarge run as a node with EKS, prefix delegation? Up to 110; kubelet keeps 1565 MiB of memory and 110m CPU, leaving 126.47 GiB and 15.89 vCPU for pods.
- How many 500m / 1 GiB pods fit? 31 per node after DaemonSets; 1 nodes for 10 replicas, about $1,369.30/month on demand.
What kubelet reserves on r8idn.4xlarge
| Setup | Max pods | kube-reserved CPU | Memory reserved + eviction | Allocatable CPU | Allocatable memory | Memory usable |
|---|---|---|---|---|---|---|
| EKS, VPC CNI default (ENI limit) secondary IPs per ENI | 394 | 110m | 4589 Mi + 100 Mi | 15.89 | 123.42 GiB | 96.4% |
| EKS, prefix delegation ENABLE_PREFIX_DELEGATION=true | 110 | 110m | 1465 Mi + 100 Mi | 15.89 | 126.47 GiB | 98.8% |
How these numbers are computed: reservation formulas. How many subnet IPs a r8idn.4xlarge takes with the VPC CNI: EKS max pods and IP calculator. Check a live node with kubectl describe node → Allocatable.
How many pods fit on one r8idn.4xlarge
Assumes DaemonSets (CNI, kube-proxy, log and metrics agents) request 200m CPU, 300 Mi and 3 pods per node. Try your own numbers in the node calculator.
| Pod requests (CPU / memory) | EKS, VPC CNI default (ENI limit) | EKS, prefix delegation | $ per pod / month |
|---|---|---|---|
| 100m / 128 Mi | 156 | 107 | $8.78 |
| 250m / 256 Mi | 62 | 62 | $22.09 |
| 250m / 512 Mi | 62 | 62 | $22.09 |
| 500m / 512 Mi | 31 | 31 | $44.17 |
| 500m / 1024 Mi | 31 | 31 | $44.17 |
| 1000m / 1024 Mi | 15 | 15 | $91.29 |
| 1000m / 2048 Mi | 15 | 15 | $91.29 |
| 2000m / 4096 Mi | 7 | 7 | $195.61 |
| 4000m / 8192 Mi | 3 | 3 | $456.43 |
Similar EKS node types
| Type | vCPU | GiB | Alloc CPU | Alloc memory | Max pods | $/month | $ per alloc GiB |
|---|---|---|---|---|---|---|---|
| r6g.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $588.67 | $4.70 |
| r7g.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $625.46 | $5.00 |
| r5a.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $659.92 | $5.27 |
| r6a.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $662.26 | $5.29 |
| r6gd.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $672.77 | $5.38 |
| r8g.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $688.07 | $5.50 |
| r5.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $735.84 | $5.88 |
| r6i.4xlarge | 16 | 128 | 15.89 | 125.14 GiB | 234 | $735.84 | $5.88 |
Closest match on other clouds
| Type | vCPU | GiB | Alloc CPU | Alloc memory | Max pods | $/month | $ per alloc GiB |
|---|---|---|---|---|---|---|---|
| e2-highmem-16 | 16 | 128 | 15.89 | 118.58 GiB | 110 | $527.93 | $4.45 |
| e16psv6 | 16 | 128 | 15.74 | 122.97 GiB | 250 | $538.74 | $4.38 |
| e16psv5 | 16 | 128 | 15.74 | 122.97 GiB | 250 | $588.38 | $4.78 |
| n4a-highmem-16 | 16 | 128 | 15.89 | 118.58 GiB | 110 | $590.31 | $4.98 |
| n4d-highmem-16 | 16 | 128 | 15.89 | 118.58 GiB | 110 | $649.29 | $5.48 |
| e16asv5 | 16 | 128 | 15.74 | 122.97 GiB | 250 | $659.92 | $5.37 |