r8a.4xlargevsr8g.4xlarge

r8g.4xlarge is 26% cheaper than r8a.4xlarge on demand in US East (N. Virginia), saving $244.92 a month. They use different processor architectures (x86_64 and arm64), so software built for one may need rebuilding to run on the other.

At a glancer8a.4xlarger8g.4xlarge
On-demand$1.278/hr$0.9426/hr26% less
Lowest rate$0.3356/hrSpot, can be interrupted$0.2495/hr26% lessSpot, can be interrupted
Size16 vCPUs, 128 GiB16 vCPUs, 128 GiB
ProcessorAMD EPYC 9R45 ProcessorAWS Graviton4 Processor
Architecturex86_64arm64

Prices in US East (N. Virginia)

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

Optionr8a.4xlarger8g.4xlarger8g.4xlarge vs r8a.4xlarge
On-demandPay by the hour$1.278$0.9426▼ 26%
SpotCan be interrupted74% off$0.335674% off$0.2495▼ 26%
1-yr reservedNo upfront—34% off$0.6235—
3-yr reservedNo upfront—55% off$0.4276—
1-yr savings planHourly commitment28% off$0.92628% off$0.6829▼ 26%
3-yr savings planHourly commitment48% off$0.666748% off$0.4917▼ 26%

Key differences

The biggest lead each one has.

Where r8a.4xlarge leads
Clock speedUp to 4.5 GHz vs 2.7 GHz
67% higher
IPv4 addresses per interface40 vs 30
33% higher
Where r8g.4xlarge leads
On-demand price$0.9426 vs $1.278 per hour
26% cheaper

Specs

11 of 40 specs differ. Those are in bold.

Compute6 of 10 differr8a.4xlarger8g.4xlarge
vCPUs1616
Physical cores1616
Threads per core11
Architecturex86_64arm64
ProcessorAMD EPYC 9R45 ProcessorAWS Graviton4 Processor
CPU makerAMDAWS
Clock speedUp to 4.5 GHz2.7 GHz
Sustained clock4.5 GHz2.8 GHz
Processor featuresAMD Turbo; AVX; AVX2; AVX512–
BurstableNoNo
MemoryAll 1 matchr8a.4xlarger8g.4xlarge
Memory (GiB)128128
Networking2 of 8 differr8a.4xlarger8g.4xlarge
NetworkUp to 15000 MegabitUp to 15 Gigabit
Network baseline7.5 Gbps7.5 Gbps
Network peak15 Gbps15 Gbps
Enhanced networkingYes (ENA)Yes (ENA)
EFANoNo
IPv6YesYes
Max network interfaces88
IPv4 addresses per interface4030
Storage1 of 11 differr8a.4xlarger8g.4xlarge
StorageEBS onlyEBS only
EBS optimizedYesYes
EBS over NVMeRequiredRequired
EBS throughputUp to 10000 MbpsUp to 10 Gbps
EBS baseline bandwidth5,000 Mbps5,000 Mbps
EBS max bandwidth10,000 Mbps10,000 Mbps
EBS baseline throughput625 MB/s625 MB/s
EBS max throughput1,250 MB/s1,250 MB/s
EBS baseline IOPS20,00020,000
EBS max IOPS40,00040,000
Max EBS volumes3232
Instance details2 of 10 differr8a.4xlarger8g.4xlarge
Familyr8ar8g
CategoryMemory optimizedMemory optimized
Current generationYesYes
Normalization factor3232
Bare metalNoNo
HypervisorNitroNitro
Placement groupsCluster, Partition, SpreadCluster, Partition, Spread
HibernationYesYes
Nitro EnclavesYesYes
Boot modesLegacy BIOS, UEFIUEFI

On-demand prices by region

Cheapest for r8a.4xlarge first. Linux, USD per hour.

Regionr8a.4xlarger8g.4xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$1.278$0.9426▼ 26%
US East (Ohio)us-east-2$1.278$0.9426▼ 26%
US West (Oregon)us-west-2$1.278$0.9426▼ 26%
Canada (Central)ca-central-1$1.40$1.032▼ 26%
EU (Ireland)eu-west-1$1.43$1.055▼ 26%
Europe (Spain)eu-south-2$1.43$1.054▼ 26%
Asia Pacific (Tokyo)ap-northeast-1$1.542$1.137▼ 26%
EU (Frankfurt)eu-central-1$1.542$1.137▼ 26%

Keep exploring

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

r8a.4xlargeMemory optimized, r8a family
r8a.4xlarge prices and specsEvery size in the r8a family

Compare r8a.4xlarge with

r8i.4xlargec8a.4xlargem8a.4xlarger7a.4xlarge
r8g.4xlargeMemory optimized, r8g family
r8g.4xlarge prices and specsEvery size in the r8g family

Compare r8g.4xlarge with

c8g.4xlargem8g.4xlarger8gd.4xlarger8i.4xlarger8gb.4xlarger8gn.4xlarger7g.4xlarger9g.4xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 48–55% 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.