AMD Ryzen 9 7845HX vs AMD Ryzen 9 7840HX

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 7840HX

► remove from comparison

The AMD Ryzen 9 7840HX is a high-end notebook processorfrom the Dragon Range series with 12 cores and hyperthreading (SMT), which means it can process up to 24 threads simultaneously. The CPU uses the current Zen 4 architecture for the 12 cores and clocks these from 2.9 GHz (base clock) up to 5.1 GHz (single-core boost). The CPU offers 12 MB L2 cache and 64 MB L3 cache (i.e. a total of 76 MB cache). The 7840X consists of three chiplets, two CCD clusters with a maximum of 8 CPU cores in 5nm (71mm²) and one IO die in 6nm (122mm²) which are all manufactured at TSMC.

The performance of the Ryzen 9 should be significantly faster than the old Ryzen 9 6980HX (top model Rembrandt H, 8 cores, max 5 GHz). This is achieved by the additional cores, higher clock rate and improved architecture. Compared to the one year older Ryzen 9 7845HX, the 7840HX is clocked 100 MHz lower.

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 7840HX is specified with 55 watts TDP and can be configured from 45 to 75 watts (cTDP).

show full text

Model

AMD Ryzen 9 7845HX

AMD Ryzen 9 7840HX

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

2900 - 5100 MHz

L1 Cache

768 KB

L2 Cache

12 MB

L3 Cache

64 MB

Cores / Threads

12 / 24
12 x 5.2 GHz AMD Zen 4

12 / 24
12 x 5.1 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