Benchmark Results and Final Analysis
Our standard benchmarks and power tests are performed using the CPU’s stock frequencies (including stock Thermal Velocity Boost), with all power-saving features enabled. Optimized defaults are set in the BIOS and the memory set using the XMP profiles. For this baseline testing, Windows is set to High Performance before we switch over to Balanced during power testing, so the PC idles appropriately.
Synthetics are a great tool to figure out if a board runs out of spec, as identical settings should produce similar performance results. Advanced memory timings are the one place where motherboard makers can still optimize for either stability or performance, though, and those settings can impact some testing.
In our synthetic benchmarks, the ROG Dark Hero performed well overall, mixing in with the other results. Again we saw some outliers in the PCMark 10 suite, but this is due to the application more than actually running 50% slower than other results. Outside of that, we have nothing abnormal to report.
In the timed applications, the LAME test showed our Dark Hero as one of the faster results, while the Corona benchmark has it matching the majority of boards we’ve tested using our Ryzen 9 5950X. Our Handbrake results were in line with others as well. Nothing anomalous here either!
3D Games and 3DMark
We’ve switched our game tests to The Division 2 and Forza Horizon 4. The games are run at 1920x1080 resolution using the Ultra preset. As the resolution goes up, the CPU tends to have less of an impact. The goal with these settings is to determine if there are differences in performance at the most commonly used resolution with settings most people use or at least strive for.
During our gaming tests, we saw appreciable gains when moving from the 3900X to the newer 5950X. Between the clock speeds, IPC and large cache differences, performance increased substantially using this CPU at our 1080p test resolution. If you game at a higher resolution, chances are you won’t see those gains unless you’re using one of the new, ultra-fast Nvidia or AMD GPUs. That out of the way, our Dark Hero proved itself to be competent in gaming as well, easily mixing in with the rest of the newly tested boards in both 3DMark and actual games.
Power Consumption / VRM Temperatures
For power testing, we used AIDA64’s System Stability Test with Stress CPU, FPU and Cache enabled, using the peak power consumption value. The wattage reading is from the wall via a Kill-A-Watt meter to capture the entire ecosystem. The only variable that changes is the motherboard; all other parts are the same.
At idle, the Dark Hero used 77 Watts from the wall, which is on the higher end of the boards tested so far. But then load wattage peaked at 214W, one of the lowest we’ve seen so far. If we average the two values, the 146W result sits in the middle of all our results.
The 14-phase 90A power bits for the CPU handled our Ryzen 9 5950X without issue. According to the Extech device, the hottest point on the VRM was about 42 degrees Celsius during stock testing. HWinfo reported 49 degrees Celsius. After overclocking our processor 4.4 GHz and ~1.3V, VRM temps peaked around 51 degrees Celsius on the Extech and almost 60C in Hwinfo. Both results are the lowest temperatures we’ve seen so far when using the new CPU. This board won’t have any issues with ambient overclocking nor for more extreme sub-ambient overclocking.
There are several ways to overclock on AMD platforms, depending on your goals. If your focus is single-threaded performance, you may want to focus on using Precision Boost Overdrive (PBO) and adjusting its parameters. If you can use all cores and threads, setting a manual CPU multiplier and voltage is likely the better route. While the latter clips peak single-threaded performance a bit, it increases all core/thread performance over the all-core boost. To that end, we settled on 4.4 GHz at ~1.3V for an all core/thread overclock.
The Dark Hero handled our 16-core/32-thread Ryzen 9 5950X without issue. Vdroop wasn’t bad but did require an adjustment to ensure the voltage we set is the voltage under load. Outside of that, the board is plenty capable of taking the flagship 5000 series to wherever your cooling can take it.
On the memory side, we know AMD is limited to around 3600/3733 MHz when keeping FCLK at a 1:1 ratio with the memory. With this in mind, we add two more sticks and run 4x8GB at DDR4 3600, which is AMD’s current sweet spot. We didn’t run into any issues on this board as expected. We set XMP and were on our way! In looking around the web, this board turns in some solid results at Hwbot. While it isn’t the best for memory overclocking (some ITX boards are due to shorter traces, among other reasons), it will undoubtedly do well for the average user and extreme overclocker.
The Asus ROG Crosshair VIII Dark Hero is a solid board to build your AMD system on. The Dark Hero is better looking than its predecessor, feature-rich, has significantly upgraded power delivery and is plenty capable all at the $400 price point. And the Dark Hero is also ready for any compatible recent CPU you can throw at it out of the box.
At $400, this isn’t a cheap motherboard and does fetch a slight premium over the non-dark Hero. But the jump from 60A to 90A MOSFETs can justify that change, especially for the overclocker. That said, it’s cheaper than the other flagship boards, including the Gigabyte X570 Aorus Extreme ($699.99 (opens in new tab)), MSI MEG X570 Godlike ($699.99 (opens in new tab)), and the ASRock X570 Aqua (Limited Edition @ $999.99 (opens in new tab)). All of these boards sport incredibly robust power delivery, multiple M.2 sockets, 2.5 GbE LAN or greater, and many other similar features. In the end, the Asus board is the least expensive flagship in the X570 family. But there are other boards down the competitors stack that compete better on price.
We know this board looks good, performs well, and has almost every feature a user would need. I would like to have seen a USB 3.2 Gen2x2 Type-C port instead of the single Gen2 bandwidth. But outside of that, there isn’t much to complain about that isn’t subjective. The Dark Hero’s performance was spot on, while its overclocking capability is there for both ambient and extreme cooling. In the end, there’s not much we don’t like about this board. If a $400 X570 based motherboard is on your shopping list, the Asus ROG Crosshair VIII Dark Hero should be on the shortlist.
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