Long awaited and now finally here: AMD presented the third generation of the RDNA architecture yesterday evening. The company also unveiled the Radeon RX 7900 XTX and Radeon RX 7900 XT graphics cards at the same event. The former has a full Navi 31 GPU with 12288 stream processors, while the latter is based on a reduced GPU with 10752 cores. AMD’s RDNA3 architecture, based on the 5nm node, is the first ever consumer Radeon GPU chiplet design. The GPU has one GPU tile manufactured in a 5nm process and six memory chipts manufactured in a 6nm process.
The AMD Radeon RX 7900 XTX
AMD’s Navi 31 GPU has 58 billion transistors and offers up to 61 TFLOPs of single-precision computing power. This GPU also features a chiplet interconnect with 5.3 TB/s. With TSMC’s 5nm node, Navi 31 GPU has transistor density increased to 165% compared to Navi 2X. AMD also confirms that the new RX 7900 XTX should be up to 1.7x faster than RX 6950XT in 4K resolution. The RDNA3 architecture is also said to offer 54% better performance per watt than RDNA2, according to AMD.
The RX 7900XT comes with a base clock of 1.9 GHz, a gaming clock of 2.3 GHz and a boost clock of up to 2.5 GHz. In terms of memory, the XTX model features 24 GB of GDDR6 memory clocked at 20 Gbps. This SKU has a 384-bit memory bus. The company shares initial performance specs in some popular titles compared to the fastest RDNA2 GPU, but unfortunately there is no comparison to NVIDIA’s current GeForce RTX 4090, which was a bit disappointing:
The Radeon 7900 XTX is the first Radeon card to support the DisplayPort 2.1 interface and can output up to 8K 165Hz or 4K at 480Hz.
Radeon RX 7900 XT
AMD confirms all clock speeds for its Radeon RX 7900 series, including for the second fastest new card. The RX 7900XT has a base clock of 1.5 GHz, a gaming clock of 2.0 GHz and a boost of up to 2.4 GHz. The memory clock is the same for both models with 20 Gbps.
The slimmed-down RX 7900 XT has 20 GB of GDDR6 memory and a 320-bit bus. This means that both cards have a maximum bandwidth of 960 GB/s and 800 GB/s, respectively. However, AMD also specifies an “effective” bandwidth of 3.5 TB/s for 7900XTX and 2.9 TB/s for 7900XT. This number is related to 96 MB and 80 MB of Infinity Cache found in the MCD chips.
AMD confirms that the Radeon RX 7900 XTX will cost $999, while the RX 7900XT will be available for $899. Both tickets will be available starting December 13.
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