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Launching Today: AMD's Radeon RX 6900 XT - A Whole Lot of Radeon for $1000
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[Image: 6900-XT-Front_678x452.jpg]

This morning AMD is releasing the final and most elusive member of their initial wave of Radeon RX 6000 series cards: the Radeon RX 6900 XT. The flagship part for AMD’s new RDNA 2 GPU architecture, the 6900 XT is all the Radeon AMD could muster for this generation, and perhaps a bit more. Marking how far AMD has come in a single generation, the RX 6900 XT is their first real shot at the very top of the market in years; and while AMD doesn’t quite reach that goal, they have still succeeded at putting together an interesting and powerful video card for the $1000 market.

Like the Radeon RX 6800 XT and 6800, the 6900 XT was announced back at AMD’s GPU keynote in November, where AMD gave the world the full story, spec.

So although the 6800 XT launched first, it would not be the final word from AMD; AMD had one more video card in the pipeline – even more powerful than the 6800 XT – and with it they would be capping off what has been a busy fall season for video cards.

Under the hood, AMD’s new flagship video card is based on the same Navi 21 silicon that has driven all the other RX 6000 series cards to date. Separating the new flagship from its earlier siblings, the new video card uses a fully-enabled version of the Navi 21 chip, allowing AMD’s lead RDNA2 architecture GPU to finally put its best foot forward with regards to performance. This is coupled with some extra binning on AMD’s part means that the 6900 XT not just the fastest Radeon yet, but also that AMD has left no stone unturned in their quest to maximize their performance.

The result is, as alluded to earlier, a bit of a moonshot. AMD gets the advantage of being the second mover – watching NVIDIA and then reacting to them – which has helped AMD to figure out what it can and can’t do. NVIDIA’s GeForce RTX 3090 is incredibly fast, but as the launch of the RTX 3080 and RX 6800 XT have since proven, it’s not entirely out of reach. So AMD has decided to have a go at it – to compete for the flagship spot and the coveted performance crown – by building the best card they could.

The flip side to that, is that it means the 6900 XT will be living up to being the cream of the Radeon crop in more than one way. By requiring a fully-enabled and binned Navi 21 chip, AMD is reaching deep into their yields to assemble their card, and those chips are going to be relatively rare. Not this is a new problem for a GPU manufacturer by any means, but it takes on an additional degree of challenge when those chips are 519mm[sup]2[/sup] slices of a very valuable 7nm wafer.

Ultimately, the $1000 price tag means that this is a video card that many will want and few can afford; but that will still be enough to keep AMD and TSMC busy for months to come.

Diving into the specs, what we’re looking at is a bona fide, genuine, fully-enabled Navi 21 part. All 80 CUs and 128 ROPs are active on this card, allowing Navi 21 to show off just how powerful it really is. AMD is clocking the card the same as the 6800 XT, so that means a peak clockspeed (boost clock) of 2250MHz, while the official game clock rating is 2015MHz. So on paper, the 6900 XT should be 11% faster in texture/compute/RT-bound workloads, while pixel-bound workloads should be relatively unchanged from the 6800 XT. It is admittedly not the largest leap, but it’s enough to justify a separate SKU – and for AMD to make a run at the GeForce RTX 3090.Speaking of clockspeeds, like the other RX 6000 series cards, the RX 6900 also comes with a couple of other performance presets. The Rage Mode preset allows for peak clockspeeds as high as 2310MHz and a game clock of 2075MHz (~3% higher), while the quiet mode dials this down to a peak of 2185MHz and a rated game clock of 1940MHz respectively.

As for memory, because AMD was already making full use of Navi 21’s 8 memory channels for the 6800 XT, they don’t have the same headroom to tap into here for the 6900 XT. As a result the card ships with the same 16GB of GDDR6 clocked at 16Gbps/pin, giving it a total memory bandwidth of 512GB/sec. This means that the 6900 XT will hit memory bottlenecks in roughly the same place as the 6800 XT does, which can limit some of the card’s real-world performance gains versus what we see on paper. AMD’s 128MB Infinity Cache is still in play here as well, though like the rest of the memory subsystem, it’s not clocked any higher on the 6900 XT than the 6800 XT.

It’s also worth noting that AMD’s Smart Access Memory technology is available for the 6900 XT as well. Using the resizing feature for the PCIe Base Address Register (BAR), AMD is able to squeeze out a bit more performance from their cards by cutting down on some PCIe transfer bottlenecks. Unfortunately SAM support still requires using one of AMD’s latest-generation Ryzen 5000 processors – which like AMD’s video cards, are hard to come by right now – so not everyone will be able to immediately take advantage of it.

Meanwhile, thanks to AMD’s binning, the company has been able to keep the power consumption of the 6900 XT at the same 300 Watts TBP (Total Board Power) as the 6800 XT. This means that the additional performance unlocked by the 6900 XT largely comes “for free”, as AMD’s use of higher-grade chips offsets what would normally be a power penalty from lighting up Navi 21’s last 8 CUs. And though not apples-to-apples, it gives AMD an advantage over NVIDIA, whose RTX 3080 and RTX 3090 cards are rated for 320W and 350W respectively.
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Additional Info: https://www.tomshardware.com/news/amd-ra...-xt-review
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