r5b.16xlargevsr8ib.16xlarge

r5b.16xlarge is 29% cheaper than r8ib.16xlarge on demand in US East (N. Virginia), saving $1,406.27 a month.

At a glancer5b.16xlarger8ib.16xlarge
On-demand$4.768/hr29% less$6.694/hr
Lowest rate$1.818/hr17% lessSpot, can be interrupted$2.197/hrSpot, can be interrupted
Size64 vCPUs, 512 GiB64 vCPUs, 512 GiB
ProcessorIntel Xeon Platinum 8259 (Cascade Lake)Intel Xeon Scalable (Granite Rapids)
Architecturex86_64x86_64

Prices in US East (N. Virginia)

“Off” is the discount against each type’s own on-demand price. Linux, USD per hour.

Optionr5b.16xlarger8ib.16xlarger8ib.16xlarge vs r5b.16xlarge
On-demandPay by the hour$4.768$6.694▲ 40%
SpotCan be interrupted62% off$1.81867% off$2.197▲ 21%
1-yr reservedNo upfront37% off$3.004——
3-yr reservedNo upfront60% off$1.931——
1-yr savings planHourly commitment28% off$3.45428% off$4.85▲ 40%
3-yr savings planHourly commitment53% off$2.22553% off$3.123▲ 40%

Key differences

The biggest lead each one has.

Where r5b.16xlarge leads
On-demand price$4.768 vs $6.694 per hour
29% cheaper
Where r8ib.16xlarge leads
Network baseline66.666 Gbps vs 20 Gbps
3.3× higher
Max EBS volumes48 vs 27
78% higher
Clock speed3.9 GHz vs 3.1 GHz
26% higher

Specs

18 of 40 specs differ. Those are in bold.

Compute4 of 10 differr5b.16xlarger8ib.16xlarge
vCPUs6464
Physical cores3232
Threads per core22
Architecturex86_64x86_64
ProcessorIntel Xeon Platinum 8259 (Cascade Lake)Intel Xeon Scalable (Granite Rapids)
CPU makerIntelIntel
Clock speed3.1 GHz3.9 GHz
Sustained clock3.1 GHz3.9 GHz
Processor featuresIntel AVX; Intel AVX2; Intel AVX512; Intel TurboIntel AVX; Intel AVX2; Intel AVX512; Intel Turbo; Intel AMX
BurstableNoNo
MemoryAll 1 matchr5b.16xlarger8ib.16xlarge
Memory (GiB)512512
Networking5 of 8 differr5b.16xlarger8ib.16xlarge
Network20 Gigabit66.66 Gigabit
Network baseline20 Gbps66.666 Gbps
Network peak20 Gbps66.666 Gbps
Enhanced networkingYes (ENA)Yes (ENA)
EFANoNo
IPv6YesYes
Max network interfaces1516
IPv4 addresses per interface5064
Storage8 of 11 differr5b.16xlarger8ib.16xlarge
StorageEBS onlyEBS only
EBS optimizedYesYes
EBS over NVMeRequiredRequired
EBS throughput40 Gbps50000 Mbps
EBS baseline bandwidth40,000 Mbps50,000 Mbps
EBS max bandwidth40,000 Mbps50,000 Mbps
EBS baseline throughput5,000 MB/s6,250 MB/s
EBS max throughput5,000 MB/s6,250 MB/s
EBS baseline IOPS173,333240,000
EBS max IOPS173,333240,000
Max EBS volumes2748
Instance details1 of 10 differr5b.16xlarger8ib.16xlarge
Familyr5br8ib
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor128128
Bare metalNoNo
HypervisorNitroNitro
Placement groupsCluster, Partition, SpreadCluster, Partition, Spread
HibernationNoNo
Nitro EnclavesYesYes
Boot modesLegacy BIOS, UEFILegacy BIOS, UEFI

On-demand prices by region

Cheapest for r5b.16xlarge first. Linux, USD per hour.

Regionr5b.16xlarger8ib.16xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$4.768$6.694▲ 40%
US East (Ohio)us-east-2$4.768$6.694▲ 40%
US West (Oregon)us-west-2$4.768$6.694▲ 40%
EU (Ireland)eu-west-1$5.344$7.503▲ 40%
EU (Frankfurt)eu-central-1$5.696$7.997▲ 40%
Asia Pacific (Tokyo)ap-northeast-1$5.792$8.132▲ 40%

Keep exploring

Each type’s own page, and how it compares with others.

r5b.16xlargeMemory optimized, r5b family
r5b.16xlarge prices and specsEvery size in the r5b family

Compare r5b.16xlarge with

r5.16xlarge
r8ib.16xlargeMemory optimized, r8ib family
r8ib.16xlarge prices and specsEvery size in the r8ib family

Compare r8ib.16xlarge with

r8i.16xlargem8ib.16xlargec8ib.16xlarger8gb.16xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 53–60% below on-demand. Connect your cloud accounts to unlock greater savings with commitment protection.

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AWS EC2 Linux prices in USD. Monthly figures use 730 hours. Prices last updated 12 Nov 2026.