AMD Ryzen 9 5900X and ASUS ROG Crosshair VIII Dark Hero Review


The AMD Ryzen 9 5900X, along with the rest of the Ryzen 5000 lineup finally challenge Intel’s single-core dominance and with strong multi-threaded performance, AMD Ryzen already was ideal for creative and professional applications but now it here to become the “best processor for gaming” title from Intel. The AMD Ryzen 9 5900X is built on the Zen 3 architecture, which on a surface level may look similar to Zen 2 – they’re both 7nm, after all. However, AMD has redesigned the architecture from the ground up to increase IPC performance and efficiency to the point where it leaves no prisoners.

AMD Ryzen 9 5900X and ASUS ROG Crosshair VIII Dark Hero ReviewThe biggest difference in architecture from Zen 2 to Zen 3 is that instead of having two Core Complexes (CCX) per compute die (CCD), each CCD only has one CCX, with each CCX having up to 8 cores, rather than 4 cores on Zen 2. This change not only cuts down on latency when cores are communicating with each other, but it also means that each CCX has access to a full 32MB of L3 cache, rather than being limited to 16MB of the stuff on Zen 2.

This means that while the Ryzen 9 5900X has the same amount of L3 Cache as the Ryzen 9 3900X at 64MB, each core has direct access to 32MB on the 5900X, rather than 16MB on the 3900X.

The AMD Ryzen 9 5900X features a 12 core, 24 thread processor, with a boost clock up to 4.8GHz. It has the same 105W TD and supports the same AM4 socket, which compatibility goes further than just 500-series motherboards, certain X470, and B450 motherboards will also support Ryzen 5000 processors like the Ryzen 9 5900X, though not all of them.

AMD Ryzen 9 5900X and ASUS ROG Crosshair VIII Dark Hero ReviewAlthough there isn’t a new chipset debut with the AMD Ryzen 5000 CPUs, but Asus’ ROG Crosshair VIII Dark Hero is a new refreshed version of Crosshair VIII Hero. The ASUS ROG Crosshair VIII Dark Hero has all the features as the last year’s Hero, with a few upgrades. The M.2 heatsinks on both slots, a premium lighting solution, integrated rear I/O shield, and the VRM Power Stages have been upgraded to 90 A from 60 A, and most importantly, ASUS has done away with the chipset fan.

Ryzen 9 5900X Specifications

Processor AMD Ryzen 9 5900X
Market Desktop
Family Zen 3
Part number(s), S-Spec 100-000000061,
Release date 2020 Q4
Lithography 7 nm FinFET
Cores 12
Threads 24
Base frequency 3.7 GHz
Turbo frequency 4.8 GHz
Cache memory 64 MB
Max memory capacity 128 GB
Memory types DDR4-3200
Max # of memory channels 2
Max memory bandwidth 47.68 GB/s
Max PCIe lanes 20
TDP 105 W
GPU integrated graphics None
Socket AM4
Maximum temperature 90°C


ASUS ROG Crosshair VIII Dark Hero Specifications
CPU Support: AMD Ryzen™ 5000/3000/2000 Series desktop processors
Power Design: CPU Power: 14-phase
Memory Power: 2-phase
Chipset: AMD X570
Integrated Graphics: Dependent on installed CPU
Memory: 4x DIMM, supports dual channel DDR4-4866 (OC) MHz
Expansion Slots: 3x PCIe 4.0 x16 slots (x16/x0/x0 or x8/x8/x4)
1x PCIe 4.0 x1 slots
Storage: 8x SATA 6 Gb/s port
2x M.2 port (SATA3/PCIe 4.0 x4)
Networking: 1x Intel I211-AT
1x Realtek RTL8125-CG
Intel WiFi 6 AX200
Rear Ports: 1x Clear CMOS button
1x BIOS flashback button
1x Optical SPDIF out port
2x LAN (RJ45) ports
8x USB 3.1 (Gen2) ports
4x USB 3.1 (Gen1) ports
2x Antenna ports
5x 3.5 mm audio jacks
Audio: ROG SupremeFX7.1 surround sound high definition audio CODEC
Fan Headers: 8x 4-pin
Form Factor: ATX Form Factor: 12.0 x 9.6 in.; 30.5 x 24.4 cm
Exclusive Features:
  • 5-Way Optimization tuning: TPU Insight, EPU Guidance, DIGI+ VRM, Fan Expert 4, and Turbo App
  • Aura Lighting Control
  • MemOK! II
  • AI Suite 3
  • Ai Charger
  • ASUS CrashFree BIOS 3
  • Armoury Crate
  • Pre-mounted I/O Shield
  • OptiMem II
  • ASUS EZ Flash 3
  • ASUS C.P.R.(CPU Parameter Recall)
  • BIOS Flashback® Button
  • Clear CMOS Button
  • Reset Button
  • ASUS Q-Code
  • ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED)
  • ASUS Q-Slot
  • ASUS Q-Connector