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AMD Ryzen 7 7840S

AMD R7 7840S

The AMD Ryzen 7 7840S is a fast high-end laptop processor of the Phoenix series. It offers 8 cores (octa core) based on the Zen 4 architecture that supports hyperthreading (16 threads). The cores clock from 3.8 (base) up to 5.1 GHz (single core boost). The processor includes 8 MB L2 cache and 16 MB L3 cache. The processor is exclusively available in Lenovo laptops but the specs are similar to the regular Ryzen 7 7840HS.

The performance of the R7 7840S is only slightly below the fastest model, the R9 7940HS, as the clock speed difference is only minimal (e.g. -100 MHz / 2% slower single core boost). Therefore, the CPU should also perform slightly higher than the old top model Ryzen 9 6980HX (8 Zen 3 cores with up to 4.9 GHz) at 54W TDP and Ryzen 9 6980HS at 35W TDP. Compared to the higher end Dragon Range series, the 7840HS should be similar to the Ryzen 7 7745HX (also 8 Zen 4 cores, max 5.1 GHz, 55W TDP, 32 MB L3).

The chip integrates a modern and fasts RDNA 3 graphics card (iGPU) called Radeon 780M with 12 CUs and up to 2.7 GHz clock speed. Furthermore, the Phoenix series include a video engine with AV1 de- and encoding, a new Xilinx FPGA based XDNA AI accelerator (Ryzen AI) that should be faster than the AI engine in the Apple M2 SOC and a dual-channel DDR5-5600 / LPDDR5x-7500 memory controller (with ECC support). The connectivity features includes 2 possible USB 4 (40 Gbps) ports and 20 PCIe 4.0 lanes for a GPU and SSDs.

The Phoenix series uses a single monolithic design (unlike the chiplet design of the 7045HX series) and is manufactured in the modern 4nm process at TSMC. The TDP can be configured between 35 and 45 Watt.

SeriesAMD Phoenix (Zen 4, Ryzen 7040)
CodenamePhoenix-HS (Zen 4)

Series: Phoenix (Zen 4, Ryzen 7040) Phoenix-HS (Zen 4)

AMD Ryzen 9 7940HS compare4 - 5.2 GHz8 / 16 cores16 MB L3
AMD Ryzen 9 PRO 7940HS compare4 - 5.2 GHz8 / 16 cores16 MB L3
AMD Ryzen 7 7840HS compare3.8 - 5.1 GHz8 / 16 cores16 MB L3
AMD Ryzen 7 7840S « 3.8 - 5.1 GHz8 / 16 cores16 MB L3
AMD Ryzen 7 PRO 7840HS compare3.8 - 5.1 GHz8 / 16 cores16 MB L3
AMD Ryzen 5 7640HS compare4.3 - 5 GHz6 / 12 cores16 MB L3
Clock Rate3800 - 5100 MHz
Level 1 Cache512 KB
Level 2 Cache8 MB
Level 3 Cache16 MB
Number of Cores / Threads8 / 16
Power Consumption (TDP = Thermal Design Power)35 Watt
Manufacturing Technology4 nm
Die Size178 mm2
Max. Temperature100 °C
FeaturesDDR5-5600/LPDDR5x-7500 RAM (incl. ECC), PCIe 4, Ryzen AI, 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
GPUAMD Radeon 780M ( - 2700 MHz)
64 Bit64 Bit support
Announcement Date01/05/2023
Product Link (external)


Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU
44.3 pt (61%)
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 1005.76     avg: 1901     median: 2222.8 (14%)     max: 2475 Points
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
18.6 fps (33%)
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
7.4 s (2%)
WebXPRT 4 - WebXPRT 4 Score
min: 247     avg: 247.5     median: 247.5 (71%)     max: 248 Points
Power Consumption - Prime95 Power Consumption - external Monitor *
64.2 Watt (11%)
Power Consumption - Cinebench R15 Multi Power Consumption - external Monitor *
66.1 Watt (12%)
Power Consumption - Idle Power Consumption - external Monitor *
8.4 Watt (6%)
Power Consumption - Idle Power Consumption 150cd 1min *
10.3 Watt (11%)
Power Consumption - Cinebench R15 Multi Power Efficiency - external Monitor
37.4 Points per Watt (28%)
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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