Instance Specification

This page describes the instance families, sizing options, and underlying hardware available for Zenlayer Elastic Compute (ZEC) instances. Use it to choose the right instance shape for your workload and understand the CPU and GPU hardware behind each family.


1. Instance Families

ZEC instance families at a glance

ZEC offers six instance families, split by CPU vendor and by whether they back standard compute or GPU-attached instances:

Family
Role
CPU Platform
CPU Model(s)

z2a

Standard CPU

AMD EPYC 2nd Gen (Rome)

EPYC 7H12

z4a

Standard CPU

AMD EPYC 4th Gen (Genoa)

EPYC 9654

za4h

Standard CPU

AMD EPYC 4th Gen (Genoa)

EPYC 9554

z2i

Standard CPU

Intel Xeon Scalable 2nd Gen (Cascade Lake)

Xeon Gold 6254 · Xeon Gold 6248

z3a

GPU instance

AMD EPYC 3rd Gen (Milan)

EPYC 7543

z4i

GPU instance

Intel Xeon Scalable 4th Gen (Sapphire Rapids)

Xeon Gold 6430

GPU instance families (z3a, z4i) are deployed exclusively in GPU-enabled instances and are not available as standard compute.

za4h is currently available only in the ZEC Mumbai region.


2. vCPU-to-RAM Ratios

Each family supports three ratio types so you can match your workload's memory profile:

Ratio Type
vCPU:RAM
Best For

CPU Intensive

1:2

Compute-bound workloads — batch processing, encoding, simulation

Standard

1:4

General-purpose workloads — web servers, application servers, APIs

Memory Intensive

1:8

Memory-bound workloads — caches, in-memory databases, analytics

Instance sizes scale from 1 vCPU up to 64 vCPU within each ratio type. For example, a z2a.std.16 is a 2nd-gen AMD instance with the 1:4 standard ratio and 16 vCPUs (16 vCPU / 64 GiB RAM).


3. vNIC and Networking Limits

vNIC capacity scales with instance size. The following limits apply across all instance families:

vCPU Count
Max vNICs
vNIC Multi-Queue
Private IPv4 per vNIC

1–2

2

1

6–10

4–8

2

2–4

15

16

4

8

30

32

8

16

30

64

16

32

30

  • vNICs: Maximum number of virtual network interfaces (including the primary vNIC) you can attach to an instance.

  • vNIC Multi-Queue: Number of transmit (Tx) and receive (Rx) queues per vNIC. Higher counts improve network throughput and reduce latency.

  • Private IPv4 per vNIC: Maximum private IPv4 addresses that can be assigned to a single vNIC.


4. Regional Availability

Available instance sizes vary by location depending on inventory. Check the Zenlayer consolearrow-up-right when creating an instance to see what's available in your target region.


5. CPU Specifications

5.1 z2a — AMD EPYC 2nd Gen (Rome)

AMD EPYC 7H12

Property
Value

Generation

AMD EPYC 2nd Gen (Rome)

Microarchitecture

Zen 2

Socket

SP3

Cores / Threads

64 / 128

Base Clock

2.60 GHz

Max Boost Clock

3.30 GHz

L2 Cache

32 MB (512 KB × 64)

L3 Cache

256 MB

Memory Controller

8-channel DDR4

Max Memory Speed

DDR4-3200

Max Memory Capacity

2 TB (4 TB with 3DS RDIMMs)

PCIe Version

PCIe 4.0

PCIe Lanes

128 per socket

TDP

280 W

Process Node

TSMC 7 nm (N7)


5.2 z3a — AMD EPYC 3rd Gen (Milan)

AMD EPYC 7543 (GPU instances only)

Property
Value

Generation

AMD EPYC 3rd Gen (Milan)

Microarchitecture

Zen 3

Socket

SP3

Cores / Threads

32 / 64

Base Clock

2.80 GHz

Max Boost Clock

3.70 GHz

L2 Cache

16 MB (512 KB × 32)

L3 Cache

128 MB

Memory Controller

8-channel DDR4

Max Memory Speed

DDR4-3200

Max Memory Capacity

2 TB (4 TB with 3DS RDIMMs)

PCIe Version

PCIe 4.0

PCIe Lanes

128 per socket

TDP

225 W

Process Node

TSMC 7 nm (N7P)


5.3 z4a — AMD EPYC 4th Gen (Genoa)

AMD EPYC 9654

Property
Value

Generation

AMD EPYC 4th Gen (Genoa)

Microarchitecture

Zen 4

Socket

SP5

Cores / Threads

96 / 192

Base Clock

2.40 GHz

Max Boost Clock

3.70 GHz

L2 Cache

96 MB (1 MB × 96)

L3 Cache

384 MB

Memory Controller

12-channel DDR5

Max Memory Speed

DDR5-4800

Max Memory Capacity

6 TB

PCIe Version

PCIe 5.0

PCIe Lanes

128 per socket

TDP

360 W

Process Node

TSMC 5 nm (N5)


5.4 za4h — AMD EPYC 4th Gen (Genoa)

AMD EPYC 9554 (ZEC Mumbai only)

Property
Value

Generation

AMD EPYC 4th Gen (Genoa)

Microarchitecture

Zen 4

Socket

SP5

Cores / Threads

64 / 128

Base Clock

3.10 GHz

Max Boost Clock

3.75 GHz

L2 Cache

64 MB (1 MB × 64)

L3 Cache

256 MB

Memory Controller

12-channel DDR5

Max Memory Speed

DDR5-4800

Max Memory Capacity

6 TB

PCIe Version

PCIe 5.0

PCIe Lanes

128 per socket

TDP

360 W

Process Node

TSMC 5 nm (N5)


5.5 z2i — Intel Xeon Scalable 2nd Gen (Cascade Lake)

Intel Xeon Gold 6254

Property
Value

Generation

2nd Gen Intel Xeon Scalable (Cascade Lake)

Microarchitecture

Cascade Lake

Socket

LGA 3647 (P0)

Cores / Threads

18 / 36

Base Clock

3.10 GHz

Max Turbo Frequency

4.00 GHz

L2 Cache

18 MB

L3 Cache (LLC)

24.75 MB

Memory Controller

6-channel DDR4

Max Memory Speed

DDR4-2933

Max Memory Capacity

1 TB per socket

PCIe Version

PCIe 3.0

PCIe Lanes

48 per socket

TDP

200 W

Process Node

Intel 14 nm++

Intel Xeon Gold 6248

Property
Value

Generation

2nd Gen Intel Xeon Scalable (Cascade Lake)

Microarchitecture

Cascade Lake

Socket

LGA 3647 (P0)

Cores / Threads

20 / 40

Base Clock

2.50 GHz

Max Turbo Frequency

3.90 GHz

L2 Cache

20 MB

L3 Cache (LLC)

27.50 MB

Memory Controller

6-channel DDR4

Max Memory Speed

DDR4-2933

Max Memory Capacity

1 TB per socket

PCIe Version

PCIe 3.0

PCIe Lanes

48 per socket

TDP

150 W

Process Node

Intel 14 nm++


5.6 z4i — Intel Xeon Scalable 4th Gen (Sapphire Rapids)

Intel Xeon Gold 6430 (GPU instances only)

Property
Value

Generation

4th Gen Intel Xeon Scalable (Sapphire Rapids)

Microarchitecture

Sapphire Rapids

Socket

LGA 4677

Cores / Threads

32 / 64

Base Clock

2.10 GHz

Max Turbo Frequency

3.40 GHz

L2 Cache

40 MB

L3 Cache (LLC)

60 MB

Memory Controller

8-channel DDR5

Max Memory Speed

DDR5-4800

Max Memory Capacity

4 TB per socket

PCIe Version

PCIe 5.0

PCIe Lanes

80 per socket

TDP

270 W

Process Node

Intel 7 (10 nm ESF)


6. GPU Specifications

NVIDIA GeForce RTX 4090

Property
Value

Architecture

Ada Lovelace

GPU Die

AD102

CUDA Cores

16,384

Tensor Cores

512 (4th Gen)

RT Cores

128 (3rd Gen)

GPU Memory

24 GB GDDR6X

Memory Bus Width

384-bit

Memory Bandwidth

1,008 GB/s

Memory Speed

21 Gbps

L2 Cache

72 MB

FP32 Performance

82.6 TFLOPS

FP16 Performance

165.2 TFLOPS (non-sparse)

TF32 Tensor Performance

82.6 TFLOPS (non-sparse) / 330.3 TFLOPS (sparse)

Boost Clock

2,520 MHz

Interface

PCIe 4.0 x16

TDP

450 W

Process Node

TSMC 4 nm (N4)

Launch Date

October 2022

NVIDIA Tesla T4

Property
Value

Architecture

Turing

GPU Die

TU104

CUDA Cores

2,560

Tensor Cores

320 (2nd Gen)

GPU Memory

16 GB GDDR6

Memory Bandwidth

320 GB/s

FP32 Performance

8.1 TFLOPS

FP16 Performance

65 TFLOPS (with sparsity)

INT8 Performance

130 TOPS

INT4 Performance

260 TOPS

ECC

Supported

Interface

PCIe 3.0 x16

Form Factor

Low-profile, single-slot

TDP

70 W

Process Node

TSMC 12 nm

Launch Date

September 2018

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