AMD Ryzen 9 7845HX vs AMD Ryzen 9 7940HX

AMD Ryzen 9 7845HX

The AMD Ryzen 9 7845HX is a fast high-end laptop processor of the Dragon Range series. It offers 12 of the 16 cores based on the Zen 4 architecture that supports hyperthreading (24 threads). The cores clock from 3 (base) up to 5.2 GHz (single core boost). The 7845HX is the second-fastest mobile Ryzen CPU at launch and derived from the desktop Ryzen 9 7900X.

The Dragon Range series still uses a chiplet design with two CCD-clusters (each with 8 possible cores) in 5nm and an IO-die (including the memory controller and the Radeon 610M iGPU) in 6nm. The chip integrates 4x USB 3.2 Gen2 (10 Gbps) ports (no USB4), 28 PCIe 5.0 lanes (for GPU and SSDs) and a dual-channel DDR5-5200 memory controller.

Performance

The average 7845HX in our database is in the same league as the Core i9-13900HX, as far as multi-thread benchmark scores are concerned. This is a super-fast chip, as of mid 2023; of course, your mileage may vary depending on how competent the cooling solution of your laptop is and how high the CPU power limits are.

The R9 7845HX is rated at a TDP of 55 Watt and can be configured from 45 to 75 Watt (cTDP).

AMD Ryzen 9 7940HX

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The AMD Ryzen 9 7940HX is a high-end notebook processor from the Dragon Range series with 16 cores and hyperthreading (SMT), which means it can process up to 32 threads simultaneously. The CPU uses the current Zen 4 architecture for the 16 cores and clocks these from 2.4 GHz (base clock) up to 5.2 GHz (single-core boost). The CPU offers 16 MB L2 cache and 64 MB L3 cache (i.e. a total of 80 MB cache). The 7940HX consists of three chiplets, two CCD clusters with 8 CPU cores each in 5nm (71mm²) and one IO die in 6nm (122mm²) which are all manufactured at TSMC.

The performance of the Ryzen 9 should be comparable to a Core i9-13900HX (24 hybrid cores, max 5.4 GHz) in the top range of mobile processors from 2024. AMD itself advertises a clear lead over the old Ryzen 9 6900HX (8 Zen 3 cores, 4.9 GHz), which can be explained by the additional cores, improved architecture and higher frequencies. Compared to the top model, the Ryzen 9 7945HX, the 7940HX is slightly lower clocked.

The chip also integrates 4x USB 3.2 Gen2 (10 Gbps) ports (no USB 4), 28 PCIe 5.0 lanes (for GPUs and SSDs), a dual-channel DDR5-5200 memory controller and a small AMD Radeon 610M graphics card (2CUs, 400 - 2200 MHz).

The R9 7940HX is specified with 55 watts TDP and can be configured up to 75 watts (cTDP).

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Model

AMD Ryzen 9 7845HX

AMD Ryzen 9 7940HX

Series

AMD Dragon Range (Zen 4, Ryzen 7045)

Codename

Dragon Range-HX (Zen 4)

Series: Dragon Range (Zen 4, Ryzen 7045) Dragon Range-HX (Zen 4)

AMD Ryzen 9 7945HX3D	2.3 - 5.4 GHz	16 / 32	128 MB L3
AMD Ryzen 9 7945HX	2.5 - 5.4 GHz	16 / 32	64 MB L3
AMD Ryzen 9 7940HX	2.4 - 5.2 GHz	16 / 32	64 MB L3
AMD Ryzen 9 7845HX «	3 - 5.2 GHz	12 / 24	64 MB L3
AMD Ryzen 9 7840HX	2.9 - 5.1 GHz	12 / 24	64 MB L3

AMD Ryzen 9 7945HX3D	2.3 - 5.4 GHz	16 / 32	128 MB L3
AMD Ryzen 9 7945HX	2.5 - 5.4 GHz	16 / 32	64 MB L3
AMD Ryzen 9 7940HX «	2.4 - 5.2 GHz	16 / 32	64 MB L3
AMD Ryzen 9 7845HX	3 - 5.2 GHz	12 / 24	64 MB L3
AMD Ryzen 9 7840HX	2.9 - 5.1 GHz	12 / 24	64 MB L3

Clock

3000 - 5200 MHz

2400 - 5200 MHz

L1 Cache

768 KB

1 MB

L2 Cache

12 MB

16 MB

L3 Cache

64 MB

Cores / Threads

12 / 24
12 x 5.2 GHz AMD Zen 4

16 / 32
16 x 5.2 GHz AMD Zen 4

TDP

55 Watt

Transistors

9900 Million

Technology

CCD = 5 nm, I/O = 6 nm

5 nm

max. Temp.

100 °C

Socket

FL1

Features

DDR5-5200 RAM, PCIe 5, MMX, SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, BMI2, ABM, FMA, ADX, SMEP, SMAP, SMT, CPB, AES-NI, RDRAND, RDSEED, SHA, SME

iGPU

AMD Radeon 610M (400 - 2200 MHz)

Architecture

x86

Announced

Manufacturer

www.amd.com