AMD Ryzen 5 8645HS vs AMD Ryzen 7 7840U

Comparative analysis of AMD Ryzen 5 8645HS and AMD Ryzen 7 7840U processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Peripherals. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark.

AMD Ryzen 5 8645HS

AMD Ryzen 7 7840U

Differences

Reasons to consider the AMD Ryzen 5 8645HS

CPU is newer: launch date 7 month(s) later
786432x more L2 cache, more data can be stored in the L2 cache for quick access later
1048576x more L3 cache, more data can be stored in the L3 cache for quick access later
Around 3% better performance in PassMark - Single thread mark: 3709 vs 3602

Specifications (specs)
Launch date	6 Dec 2023 vs May 2023
L2 cache	1 MB (per core) vs 1MB (per core)
L3 cache	16 MB (shared) vs 16MB (shared)
Benchmarks
PassMark - Single thread mark	3709 vs 3602

Reasons to consider the AMD Ryzen 7 7840U

2 more cores, run more applications at once: 8 vs 6
4 more threads: 16 vs 12
Around 2% higher clock speed: 5.1 GHz vs 5 GHz
Around 33% more L1 cache; more data can be stored in the L1 cache for quick access later
Around 61% lower typical power consumption: 28 Watt vs 45 Watt
Around 9% better performance in PassMark - CPU mark: 24990 vs 22823

Specifications (specs)
Number of cores	8 vs 6
Number of threads	16 vs 12
Maximum frequency	5.1 GHz vs 5 GHz
L1 cache	64K (per core) vs 64 KB (per core)
Thermal Design Power (TDP)	28 Watt vs 45 Watt
Benchmarks
PassMark - CPU mark	24990 vs 22823

Compare benchmarks

CPU 1: AMD Ryzen 5 8645HS
CPU 2: AMD Ryzen 7 7840U

PassMark - Single thread mark

CPU 1

CPU 2

3709

3602

PassMark - CPU mark

CPU 1

CPU 2

22823

24990

Name	AMD Ryzen 5 8645HS	AMD Ryzen 7 7840U
PassMark - Single thread mark	3709	3602
PassMark - CPU mark	22823	24990

Compare specifications (specs)

	AMD Ryzen 5 8645HS	AMD Ryzen 7 7840U
Essentials
Launch date	6 Dec 2023	May 2023
Place in performance rating	273	286
Performance
Base frequency	4.3 GHz	3.3 GHz
Die size	178 mm²	178 mm²
L1 cache	64 KB (per core)	64K (per core)
L2 cache	1 MB (per core)	1MB (per core)
L3 cache	16 MB (shared)	16MB (shared)
Manufacturing process technology	4 nm	4 nm
Maximum core temperature	100°C	100°C
Maximum frequency	5 GHz	5.1 GHz
Number of cores	6	8
Number of threads	12	16
Transistor count	25,000 million	25,000 million
Unlocked
Memory
ECC memory support
Supported memory types	DDR5	DDR5-5600 MHz, Dual-channel
Compatibility
Configurable TDP	35-54 Watt	15-30 Watt
Max number of CPUs in a configuration	1	1
Sockets supported	FP8	FP8
Thermal Design Power (TDP)	45 Watt	28 Watt
Peripherals
PCIe configurations	Gen 4, 20 Lanes, (CPU only)	Gen 4, 20 Lanes, (CPU only)