Jesper Berg
The ASRock Radeon RX 7900 XTX Phantom Gaming OC is a custom-clocked AIB (add-in board) based on AMD’s RX 7900 XTX/Navi 31 XTX GPU, launched in November 2022. Compared to the reference Made-by-AMD (MBA) card, it requires an extra 8-pin connector from the power supply and offers up to 8% higher clocks out of the box. It’s also physically larger than the reference board.
Specifications Vs. Reference
| Specifications | ASRock RX 7900 XTX Phantom Gaming OC | AMD RX 7900 XTX Reference Model |
|---|---|---|
| GPU | Navi 31 XTX | Navi 31 XTX |
| Shading Units | 6144 | 6144 |
| GPU Clock: Base/Game/Boost | 1855 MHz / 2455 MHz / 2615 MHz | 1855 MHz / 2300 MHz / 2500 MHz |
| FP32 Theoretical Performance | 64.32 TFLOPS | 61.42 TFLOPS |
| Dual BIOS | No | No |
| Memory Configuration | 24 GB GDDR6 | 24 GB GDDR6 |
| Memory Clock (Effective) | 2500 MHz (20 Gbps) | 2500 MHz (20 Gbps) |
| Memory Bandwidth (Bus Width) | 960 GB/s (384-bit) | 960 GB/s (384-bit) |
| Outputs | 1x HDMI 2.1a 3x DisplayPort 2.1 | 1x HDMI 2.1a 2x DisplayPort 2.1 1x USB Type-C |
| TDP | 355 Watt | 355 Watt |
| Recommended Power Supply | 1000 Watt | 800 Watt |
| PCIe Power Connectors | 3x 8-pin | 2x 8-pin |
| Slots | 2.8-Slot | 2.5-Slot |
| Dimensions (Length/Width/Height) | 330 mm (13 in) 140 mm (5.5 in) 58 mm (2.3 in) | 287 mm (11.3 in) 110 mm (4.3 in) 51 mm (2 in) |
ASRock’s RX 7900 XTX Phantom Gaming OC comes with a factory overclock that significantly exceeds the standard configuration, though not quite as much as the Sapphire Nitro+ RX 7900 XTX. The game clock, which is what the GPU is expected to run at when gaming, is up from 2269 MHz to 2455 MHz – an increase of about 7%. The somewhat less relevant maximum boost clock is also boosted, but not as much.
Like many other third-party RX 7900 XTX cards, including some that ship with reference clocks such as the MSI Gaming Trio Classic, it is fitted with an additional 8-pin power connector. Unlike recent Nvidia cards, however, there are no AMD cards from this generation that use the new 16-pin 12VHPWR connector, so no adapter is needed.
Since the Phantom Gaming OC card is factory overclocked, it should be expected to use more power than the MBA reference board when running at the OC clock speeds. ASRock has therefore increased the power supply recommendation to a full 1,000 Watts. This of course applies to the full system, whereas the card’s (reference) TDP is 355 W.
Cooling Solution
The triple-fan Phantom Gaming cooler is larger than its MBA counterpart in every dimension, which is reasonable as it needs to manage elevated clocks and additional power consumption. Out of the three fans, the center fan spin on the Phantom Gaming card is perpendicular to the outer two fans, which is a common solution to reduce turbulence and improve air dispersion via the heatsink.
Other features of the cooler, as highlighted by ASRock, include a reinforced metal frame, a metal backplate, striped ring fans to improve airflow, and a nickel-plated copper base to maximize the GPU’s contact with the heatsink. Like most modern high-end graphics cards, the Phantom Gaming RX 7900 XTX also comes with a ‘fan stop’ feature, meaning that the fans are inactive and completely silent when the GPU is idle.
There are also Polychrome Sync RGB elements that can be coupled with the motherboards via an ARGB header. This feature can however be turned off entirely via an onboard switch by those who prefer a more discrete look.
About Radeon RX 7900 XTX
In November 2022, AMD released its top-tier GPU, dubbed RX 7900 XTX (code name Navi 31 XTX) to rival Nvidia’s recently launched RTX 4000 series. This chip is the company’s flagship GPU for the years 2022 and 2023 and features a new chiplet-based design (a first among consumer GPUs), built using a combination of 5nm and 6nm process nodes at TSMC.
The Radeon RX 7900 XTX, which incorporates 57.7 million transistors on a large 529 mm² die, offers DirectX 12 Ultimate support, hardware-based raytracing using 96 acceleration cores features, and variable-rate shading. It consists of 192 Render Output Units (ROPs), 6144 shaders, and 384 Texture Mapping Units (TMUs).
All RX 7900 XTX GPUs are coupled with 24 GB of GDDR6 VRAM that operates at a speed of 20 Gbps on a 384-bit memory bus.
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