r8ib.12xlarge as an EKS node
48 vCPU384 GiBx86_64Intel Xeon Scalable (Granite Rapids)AWS us-east-1R8IB 12xlarge Extra Large
Where the r8ib.12xlarge goes
Default EKS setup: EKS, VPC CNI default (ENI limit).
CPU47.61 of 48 vCPU left for your pods
Memory377.02 GiB of 384 GiB left for your pods
your podsDaemonSets (200m, 300 MiB assumed)kubelet reservedeviction
590max pods per node
$3,665.18on demand / month · $5.02/h
$1,747.85spot / month (varies)
r8ib.12xlarge EKS max pods and allocatable memory — quick answers
- How many pods can a r8ib.12xlarge run as a node with EKS, VPC CNI default (ENI limit)? Up to 590; kubelet keeps 6845 MiB of memory and 190m CPU, leaving 377.32 GiB and 47.81 vCPU for pods.
- How many pods can a r8ib.12xlarge run as a node with EKS, prefix delegation? Up to 250; kubelet keeps 3105 MiB of memory and 190m CPU, leaving 380.97 GiB and 47.81 vCPU for pods.
- How many 500m / 1 GiB pods fit? 95 per node after DaemonSets; 1 nodes for 10 replicas, about $3,665.18/month on demand.
What kubelet reserves on r8ib.12xlarge
| 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 | 590 | 190m | 6745 Mi + 100 Mi | 47.81 | 377.32 GiB | 98.3% |
| EKS, prefix delegation ENABLE_PREFIX_DELEGATION=true | 250 | 190m | 3005 Mi + 100 Mi | 47.81 | 380.97 GiB | 99.2% |
How these numbers are computed: reservation formulas. How many subnet IPs a r8ib.12xlarge 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 r8ib.12xlarge
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 | 476 | 247 | $7.70 |
| 250m / 256 Mi | 190 | 190 | $19.29 |
| 250m / 512 Mi | 190 | 190 | $19.29 |
| 500m / 512 Mi | 95 | 95 | $38.58 |
| 500m / 1024 Mi | 95 | 95 | $38.58 |
| 1000m / 1024 Mi | 47 | 47 | $77.98 |
| 1000m / 2048 Mi | 47 | 47 | $77.98 |
| 2000m / 4096 Mi | 23 | 23 | $159.36 |
| 4000m / 8192 Mi | 11 | 11 | $333.20 |
Similar EKS node types
| Type | vCPU | GiB | Alloc CPU | Alloc memory | Max pods | $/month | $ per alloc GiB |
|---|---|---|---|---|---|---|---|
| r6g.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $1,766.02 | $4.63 |
| r7g.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $1,876.39 | $4.92 |
| r5a.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $1,979.76 | $5.19 |
| r6a.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $1,986.77 | $5.21 |
| r6gd.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $2,018.30 | $5.30 |
| r8g.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $2,064.21 | $5.42 |
| r5.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $2,207.52 | $5.79 |
| r6i.12xlarge | 48 | 384 | 47.81 | 381.14 GiB | 234 | $2,207.52 | $5.79 |
Closest match on other clouds
| Type | vCPU | GiB | Alloc CPU | Alloc memory | Max pods | $/month | $ per alloc GiB |
|---|---|---|---|---|---|---|---|
| e48psv6 | 48 | 384 | 47.42 | 378.97 GiB | 250 | $1,615.49 | $4.26 |
| n4a-highmem-48 | 48 | 384 | 47.81 | 369.46 GiB | 110 | $1,770.92 | $4.79 |
| n4d-highmem-48 | 48 | 384 | 47.81 | 369.46 GiB | 110 | $1,947.87 | $5.27 |
| e48asv5 | 48 | 384 | 47.42 | 378.97 GiB | 250 | $1,979.76 | $5.22 |
| ec48asv5 | 48 | 384 | 47.42 | 378.97 GiB | 250 | $1,979.76 | $5.22 |
| n2d-highmem-48 | 48 | 384 | 47.81 | 369.46 GiB | 110 | $1,996.93 | $5.40 |