c8a.12xlargevsc8g.12xlarge

c8g.12xlarge is 26% cheaper than c8a.12xlarge on demand in US East (N. Virginia), saving $490.78 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 glancec8a.12xlargec8g.12xlarge
On-demand$2.587/hr$1.914/hr26% less
Lowest rate$0.6765/hrSpot, can be interrupted$0.5118/hr24% lessSpot, can be interrupted
Size48 vCPUs, 96 GiB48 vCPUs, 96 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.

Optionc8a.12xlargec8g.12xlargec8g.12xlarge vs c8a.12xlarge
On-demandPay by the hour$2.587$1.914▼ 26%
SpotCan be interrupted74% off$0.676573% off$0.5118▼ 24%
1-yr reservedNo upfront—34% off$1.261—
3-yr reservedNo upfront—56% off$0.8412—
1-yr savings planHourly commitment28% off$1.86928% off$1.372▼ 27%
3-yr savings planHourly commitment52% off$1.24952% off$0.9268▼ 26%

Key differences

The biggest lead each one has.

Where c8a.12xlarge leads
IPv4 addresses per interface64 vs 30
2.1× higher
Clock speedUp to 4.5 GHz vs 2.7 GHz
67% higher
Where c8g.12xlarge leads
On-demand price$1.914 vs $2.587 per hour
26% cheaper

Specs

11 of 40 specs differ. Those are in bold.

Compute6 of 10 differc8a.12xlargec8g.12xlarge
vCPUs4848
Physical cores4848
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 matchc8a.12xlargec8g.12xlarge
Memory (GiB)9696
Networking3 of 8 differc8a.12xlargec8g.12xlarge
Network22500 Megabit22.5 Gigabit
Network baseline22.5 Gbps22.5 Gbps
Network peak22.5 Gbps22.5 Gbps
Enhanced networkingYes (ENA)Yes (ENA)
EFANoNo
IPv6YesYes
Max network interfaces128
IPv4 addresses per interface6430
StorageAll 11 matchc8a.12xlargec8g.12xlarge
StorageEBS onlyEBS only
EBS optimizedYesYes
EBS over NVMeRequiredRequired
EBS throughput15000 Mbps15000 Mbps
EBS baseline bandwidth15,000 Mbps15,000 Mbps
EBS max bandwidth15,000 Mbps15,000 Mbps
EBS baseline throughput1,875 MB/s1,875 MB/s
EBS max throughput1,875 MB/s1,875 MB/s
EBS baseline IOPS60,00060,000
EBS max IOPS60,00060,000
Max EBS volumes3232
Instance details2 of 10 differc8a.12xlargec8g.12xlarge
Familyc8ac8g
CategoryCompute optimizedCompute optimized
Current generationYesYes
Normalization factor9696
Bare metalNoNo
HypervisorNitroNitro
Placement groupsCluster, Partition, SpreadCluster, Partition, Spread
HibernationYesYes
Nitro EnclavesYesYes
Boot modesLegacy BIOS, UEFIUEFI

On-demand prices by region

Cheapest for c8a.12xlarge first. Linux, USD per hour.

Regionc8a.12xlargec8g.12xlargeDifference
US East (N. Virginia)Used in summaryus-east-1$2.587$1.914▼ 26%
US East (Ohio)us-east-2$2.587$1.907▼ 26%
US West (Oregon)us-west-2$2.587$1.914▼ 26%
Europe (Spain)eu-south-2$2.775$2.046▼ 26%
EU (Ireland)eu-west-1$2.775$2.047▼ 26%
EU (Frankfurt)eu-central-1$2.952$2.177▼ 26%
Asia Pacific (Tokyo)ap-northeast-1$3.256$2.401▼ 26%

Keep exploring

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

c8a.12xlargeCompute optimized, c8a family
c8a.12xlarge prices and specsEvery size in the c8a family

Compare c8a.12xlarge with

c8i.12xlarger8a.12xlargem8a.12xlargec7a.12xlarge
c8g.12xlargeCompute optimized, c8g family
c8g.12xlarge prices and specsEvery size in the c8g family

Compare c8g.12xlarge with

c8gb.12xlargec8gn.12xlargec8i.12xlargem8g.12xlarger8g.12xlargec8gd.12xlargec7g.12xlargec9g.12xlarge

Pay the committed rate, with commitment protection

The best committed rate on these two is 52–56% 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.