r5b.12xlargevsr8ib.12xlarge

r5b.12xlarge is 29% cheaper than r8ib.12xlarge on demand in US East (N. Virginia), saving $1,054.70 a month.

At a glancer5b.12xlarger8ib.12xlarge
On-demand$3.576/hr29% less$5.021/hr
Lowest rate$1.233/hr43% lessSpot, can be interrupted$2.17/hrSpot, can be interrupted
Size48 vCPUs, 384 GiB48 vCPUs, 384 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.12xlarger8ib.12xlarger8ib.12xlarge vs r5b.12xlarge
On-demandPay by the hour$3.576$5.021▲ 40%
SpotCan be interrupted66% off$1.23357% off$2.17▲ 76%
1-yr reservedNo upfront37% off$2.253——
3-yr reservedNo upfront59% off$1.448——
1-yr savings planHourly commitment28% off$2.59128% off$3.638▲ 40%
3-yr savings planHourly commitment53% off$1.66853% off$2.342▲ 40%

Key differences

The biggest lead each one has.

Where r5b.12xlarge leads
On-demand price$3.576 vs $5.021 per hour
29% cheaper
Where r8ib.12xlarge leads
Network baseline50 Gbps vs 12 Gbps
4.2× higher
EBS baseline IOPS180,000 vs 130,000
38% 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.12xlarger8ib.12xlarge
vCPUs4848
Physical cores2424
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.12xlarger8ib.12xlarge
Memory (GiB)384384
Networking5 of 8 differr5b.12xlarger8ib.12xlarge
Network10 Gigabit50 Gigabit
Network baseline12 Gbps50 Gbps
Network peak12 Gbps50 Gbps
Enhanced networkingYes (ENA)Yes (ENA)
EFANoNo
IPv6YesYes
Max network interfaces812
IPv4 addresses per interface3050
Storage8 of 11 differr5b.12xlarger8ib.12xlarge
StorageEBS onlyEBS only
EBS optimizedYesYes
EBS over NVMeRequiredRequired
EBS throughput30 Gbps37500 Mbps
EBS baseline bandwidth30,000 Mbps37,500 Mbps
EBS max bandwidth30,000 Mbps37,500 Mbps
EBS baseline throughput3,750 MB/s4,687.5 MB/s
EBS max throughput3,750 MB/s4,687.5 MB/s
EBS baseline IOPS130,000180,000
EBS max IOPS130,000180,000
Max EBS volumes2732
Instance details1 of 10 differr5b.12xlarger8ib.12xlarge
Familyr5br8ib
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor9696
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.12xlarge first. Linux, USD per hour.

Regionr5b.12xlarger8ib.12xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$3.576$5.021▲ 40%
US East (Ohio)us-east-2$3.576$5.021▲ 40%
US West (Oregon)us-west-2$3.576$5.021▲ 40%
EU (Ireland)eu-west-1$4.008$5.627▲ 40%
EU (Frankfurt)eu-central-1$4.272$5.998▲ 40%
Asia Pacific (Tokyo)ap-northeast-1$4.344$6.099▲ 40%

Keep exploring

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

r5b.12xlargeMemory optimized, r5b family
r5b.12xlarge prices and specsEvery size in the r5b family

Compare r5b.12xlarge with

r5.12xlarge
r8ib.12xlargeMemory optimized, r8ib family
r8ib.12xlarge prices and specsEvery size in the r8ib family

Compare r8ib.12xlarge with

r8i.12xlargem8ib.12xlargec8ib.12xlarger8gb.12xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 53–59% 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.