r8i-flex.12xlargevsr8i.12xlarge

r8i-flex.12xlarge is 5% cheaper than r8i.12xlarge on demand in US East (N. Virginia), saving $121.76 a month.

At a glancer8i-flex.12xlarger8i.12xlarge
On-demand$3.167/hr5% less$3.334/hr
Lowest rate$0.614/hr17% lessSpot, can be interrupted$0.7437/hrSpot, can be interrupted
Size48 vCPUs, 384 GiB48 vCPUs, 384 GiB
ProcessorIntel Xeon Scalable (Granite Rapids)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.

Optionr8i-flex.12xlarger8i.12xlarger8i.12xlarge vs r8i-flex.12xlarge
On-demandPay by the hour$3.167$3.334▲ 5%
SpotCan be interrupted81% off$0.61478% off$0.7437▲ 21%
1-yr savings planHourly commitment28% off$2.29528% off$2.416▲ 5%
3-yr savings planHourly commitment48% off$1.65248% off$1.739▲ 5%

Key differences

The biggest lead each one has.

Where r8i-flex.12xlarge leads
On-demand price$3.167 vs $3.334 per hour
5% cheaper
Where r8i.12xlarge leads
Network baseline22.5 Gbps vs 11.25 Gbps
2× higher
EBS baseline bandwidth15,000 Mbps vs 7,500 Mbps
2× higher

Specs

9 of 40 specs differ. Those are in bold.

ComputeAll 10 matchr8i-flex.12xlarger8i.12xlarge
vCPUs4848
Physical cores2424
Threads per core22
Architecturex86_64x86_64
ProcessorIntel Xeon Scalable (Granite Rapids)Intel Xeon Scalable (Granite Rapids)
CPU makerIntelIntel
Clock speed3.9 GHz3.9 GHz
Sustained clock3.9 GHz3.9 GHz
Processor featuresIntel AVX; Intel AVX2; Intel AVX512; Intel Turbo; Intel AMXIntel AVX; Intel AVX2; Intel AVX512; Intel Turbo; Intel AMX
BurstableNoNo
MemoryAll 1 matchr8i-flex.12xlarger8i.12xlarge
Memory (GiB)384384
Networking2 of 8 differr8i-flex.12xlarger8i.12xlarge
NetworkUp to 22500 Megabit22500 Megabit
Network baseline11.25 Gbps22.5 Gbps
Network peak22.5 Gbps22.5 Gbps
Enhanced networkingYes (ENA)Yes (ENA)
EFANoNo
IPv6YesYes
Max network interfaces1212
IPv4 addresses per interface5050
Storage4 of 11 differr8i-flex.12xlarger8i.12xlarge
StorageEBS onlyEBS only
EBS optimizedYesYes
EBS over NVMeRequiredRequired
EBS throughputUp to 15000 Mbps15000 Mbps
EBS baseline bandwidth7,500 Mbps15,000 Mbps
EBS max bandwidth15,000 Mbps15,000 Mbps
EBS baseline throughput937.5 MB/s1,875 MB/s
EBS max throughput1,875 MB/s1,875 MB/s
EBS baseline IOPS30,00060,000
EBS max IOPS60,00060,000
Max EBS volumes3232
Instance details3 of 10 differr8i-flex.12xlarger8i.12xlarge
Familyr8i-flexr8i
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor9696
Bare metalNoNo
HypervisorNitroNitro
Placement groupsPartition, SpreadCluster, Partition, Spread
HibernationNoNo
Nitro EnclavesNoYes
Boot modesLegacy BIOS, UEFILegacy BIOS, UEFI

On-demand prices by region

Cheapest for r8i-flex.12xlarge first. Linux, USD per hour.

Regionr8i-flex.12xlarger8i.12xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$3.167$3.334▲ 5%
US East (Ohio)us-east-2$3.167$3.334▲ 5%
US West (Oregon)us-west-2$3.167$3.334▲ 5%
Asia Pacific (Malaysia)ap-southeast-5$3.248$3.419▲ 5%
Asia Pacific (Hyderabad)ap-south-2$3.268$3.44▲ 5%
Asia Pacific (Mumbai)ap-south-1$3.268$3.44▲ 5%
EU (Stockholm)eu-north-1$3.368$3.546▲ 5%
Canada (Central)ca-central-1$3.469$3.652▲ 5%
Canada West (Calgary)ca-west-1$3.469$3.652▲ 5%
US West (N. California)us-west-1$3.519$3.704▲ 5%
EU (Ireland)eu-west-1$3.544$3.731▲ 5%
Europe (Spain)eu-south-2$3.544$3.731▲ 5%
EU (London)eu-west-2$3.72$3.916▲ 5%
EU (Milan)eu-south-1$3.72$3.916▲ 5%
EU (Paris)eu-west-3$3.72$3.916▲ 5%
Asia Pacific (Sydney)ap-southeast-2$3.796$3.995▲ 5%
AWS GovCloud (US-East)us-gov-east-1$3.796$3.995▲ 5%
AWS GovCloud (US-West)us-gov-west-1$3.796$3.995▲ 5%
Asia Pacific (Seoul)ap-northeast-2$3.821$4.022▲ 5%
Asia Pacific (Singapore)ap-southeast-1$3.821$4.022▲ 5%
Asia Pacific (Tokyo)ap-northeast-1$3.821$4.022▲ 5%
EU (Frankfurt)eu-central-1$3.821$4.022▲ 5%
Middle East (UAE)me-central-1$3.899$4.104▲ 5%
Asia Pacific (New Zealand)ap-southeast-6$3.985$4.195▲ 5%
Europe (Zurich)eu-central-2$4.203$4.424▲ 5%
Africa (Cape Town)af-south-1$4.223$4.445▲ 5%
South America (Sao Paulo)sa-east-1$5.053$5.318▲ 5%

Keep exploring

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

r8i-flex.12xlargeMemory optimized, r8i-flex family
r8i-flex.12xlarge prices and specsEvery size in the r8i-flex family

Compare r8i-flex.12xlarge with

c8i-flex.12xlargem8i-flex.12xlarge
r8i.12xlargeMemory optimized, r8i family
r8i.12xlarge prices and specsEvery size in the r8i family

Compare r8i.12xlarge with

c8i.12xlargem8i.12xlarger8g.12xlarger8a.12xlarger8ib.12xlarger8id.12xlarger8idb.12xlarger8idn.12xlarger8in.12xlarger7i.12xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 48% 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.