ASRock Radeon RX 9070 XT Steel Legend VS XFX Mercury Radeon RX 9070 XT OC Gaming Edition

Both the ASRock Steel Legend and the XFX Mercury share identical underlying GPU silicon: the same 4096 shading units, 256 TMUs, and 128 ROPs. This means any performance difference between the two cards comes purely from clock speeds, not architectural advantages. Both also match on 2518 MHz memory speed and support Double Precision Floating Point, so those factors do not differentiate them.

Where they diverge is in how aggressively each card is factory-tuned. The XFX Mercury runs a notably higher base clock of 1870 MHz versus the Steel Legend's 1660 MHz — a gap of 210 MHz at the floor. At boost, the XFX reaches 3100 MHz compared to 2970 MHz on the ASRock, a 130 MHz lead. These clock advantages translate directly into every derived throughput metric: the XFX edges ahead with 50.79 TFLOPS of floating-point performance versus 48.66 TFLOPS, and a texture rate of 793.6 GTexels/s against 760.3 GTexels/s. In practice, this roughly 4% compute advantage can narrow the gap to the next GPU tier in bandwidth-heavy or shader-intensive workloads, though real-world gaming frame rates rarely scale linearly with compute throughput alone.

The XFX Mercury holds a clear, if modest, performance edge in this group strictly based on its higher factory clock speeds and the resulting throughput gains across every measurable metric. The ASRock Steel Legend is not a slow card — both are high-performance RX 9070 XT variants — but if raw out-of-box performance is the priority and all else is equal, the XFX is the stronger performer on paper.

The memory configurations of these two cards are nearly identical in every meaningful way. Both feature 16GB of GDDR6 across a 256-bit bus at the same 20000 MHz effective speed, and both support ECC memory — a feature relevant for workstation or compute use cases where data integrity under load matters. For gaming purposes, 16GB is a generous allocation that comfortably handles current high-resolution and high-texture-quality workloads, with headroom for near-future titles.

The only numerical difference is in maximum memory bandwidth: the ASRock Steel Legend is rated at 644.6 GB/s versus 640 GB/s for the XFX Mercury. This 4.6 GB/s gap is less than 1% and almost certainly falls within measurement rounding rather than reflecting any real-world difference in memory subsystem design. At these bandwidth levels, neither card will be memory-bottlenecked in any conventional gaming or content creation scenario.

This group is effectively a tie. The two cards share the same memory technology, capacity, bus width, and speed — the marginal bandwidth difference carries no practical significance. A buyer choosing between them can treat memory as a non-factor in the decision.

Across every feature in this group, the ASRock Steel Legend and the XFX Mercury are identical — there is not a single differentiating data point between them. Both carry DirectX 12 Ultimate support, which is the relevant baseline for modern gaming features like hardware ray tracing, variable rate shading, and mesh shaders. Ray tracing support is confirmed for both, meaning neither card is disadvantaged when playing titles that leverage AMD's ray tracing implementation.

On the upscaling front, both cards support FSR4 and lack DLSS and XeSS (XMX) — an expected profile for AMD hardware. FSR4 represents AMD's most current upscaling generation, offering AI-based image reconstruction that meaningfully improves on prior FSR versions. Both cards also support AMD SAM (Smart Access Memory), which allows a compatible AMD CPU to access the full GPU frame buffer, a feature that can provide a measurable framerate uplift in SAM-enabled systems. Neither card has LHR (Lite Hash Rate) restrictions, and both offer RGB lighting and support for up to 4 simultaneous displays.

This group is a complete tie. Every software feature, API version, and capability is shared between the two cards. Feature set should play no role in choosing between them.

The port layouts on both cards are identical: one HDMI 2.1b output and three DisplayPort outputs, for a total of four display connections — matching the four-display limit noted in the Features group. HDMI 2.1b is the current high-end standard, capable of driving 4K at high refresh rates or 8K displays, making it well-suited for modern TVs and monitors alike. The three DisplayPort outputs provide flexibility for multi-monitor desktop setups or daisy-chaining compatible displays.

Neither card offers USB-C, mini DisplayPort, or DVI outputs. The absence of USB-C is worth noting for users who own newer monitors that accept video over USB-C, as an adapter would be required. However, this limitation applies equally to both cards and is not a differentiating factor between them.

Port selection is a tie in every respect. Buyers with specific connectivity needs — such as USB-C display output — will face the same considerations regardless of which card they choose.

At the foundation, these two cards are built on the same silicon: identical RDNA 4.0 architecture, the same 4nm manufacturing process, and the same transistor count of 53,900 million. Both draw a 304W TDP and connect via PCIe 5.0, so power delivery requirements and motherboard compatibility are identical. Neither offers liquid cooling, relying purely on air cooling solutions designed by their respective board partners.

The one meaningful difference in this group is physical size. The ASRock Steel Legend measures 298 × 131 mm, while the XFX Mercury is considerably larger at 360 × 155 mm — 62mm longer and 24mm taller. That is a substantial difference in footprint. The XFX's larger dimensions likely accommodate a bigger heatsink and fan array, which can translate to better thermal headroom and potentially quieter operation under sustained load, though neither thermal performance nor noise levels are provided in the data to confirm this. What the data does confirm is that the XFX will require more physical clearance inside a case.

For builders with compact mid-tower or small-form-factor cases, the ASRock Steel Legend has a clear practical advantage due to its significantly smaller dimensions. In systems where space is not a constraint, size becomes a non-issue and this group otherwise offers no differentiating factors between the two cards.