AMD Radeon RX 6900 XTX Graphics Card Rumored To Feature 18 Gbps GDDR6 Memory, Increased Clock Speeds With Navi 21 XTXH GPU, Faster Than RTX 3090


AMD is allegedly working on its fastest Big Navi 21 GPU-based graphics card, the Radeon RX 6900 XTX. The new information comes from a slide that has been leaked by CyberPunkCat which states that the card will feature faster memory and clock speeds.

AMD Radeon RX 6900 XTX Allegedly In The Works, Could Feature Navi 21 XTXH GPU With 18 Gbps Memory & Faster Clocks

The AMD Radeon RX 6900 XT currently has two variations, a standard variant that features the Navi 21 XT GPU and a binned variant featuring the Navi 21 XTXH GPU. Both of these variants are known as Radeon RX 6900 XT. Based on the new rumor, AMD could be working on a third variant that will combine the Navi 21 XTXH GPU with faster memory, allowing for faster performance in gaming that will surpass NVIDIA's GeForce RTX 3090.

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An alleged slide of AMD's Radeon RX 6900 XTX graphics card has been leaked. (Image Source: CyberPunkCat)

According to the alleged slide, the AMD Radeon RX 6900 XTX will feature a compute horsepower of 24.93 TFLOPs. The existing reference Radeon RX 6900 XT features a compute horsepower of 23.04 TFLOPs with a boost clock of 2250 MHz. With Navi 21 XTXH GPU on the Radeon RX 6900 XTX should feature a boost clock of 2435 MHz. This is an 8% improvement in the boost clock for a 8% compute power increase.

The second change comes in the form of memory. The AMD Radeon RX 6900 XT is rumored to get 18 Gbps memory dies which should deliver a nice boost in bandwidth over the existing 16 Gbps G6 chips. The card will retain its 16 GB GDDR6 memory capacity but bandwidth should be boosted to 576 GB/s, a 12.5% improvement over the reference card. All of these changes will definitely have an impact on the GBP. The existing Navi 21 XT-based reference model has a TBP of 300W so we could be looking at around 350W TBP with the increased clocks on GPU and memory modules.

Also, you might be wondering if such a card makes sense when AIBs have already released Navi 21 XTXH variants. The AMD Radeon RX 6900 XTX might end up being an OEM-only solution as AMD has already started offering an RX 6900 XT LC 'Liquid Cooled' variant to its PC & OEM partners. The slide interestingly reads 'Expanding The AMD RDNA Family' which means that it could be a proper retail launch but that remains to be seen. As for performance, the AMD Radeon RX 6900 XT trades blows with the NVIDIA Geforce RTX 3090 graphics card so this variant would push that lead even further.

AMD Radeon RX 6000 Series "RDNA 2" Graphics Card Lineup:

Graphics CardAMD Radeon RX 6400AMD Radeon RX 6500 XTAMD Radeon RX 6600AMD Radeon RX 6600 XTAMD Radeon RX 6700 XTAMD Radeon RX 6800AMD Radeon RX 6800 XTAMD Radeon RX 6900 XTAMD Radeon RX 6900 XT Liquid CooledAMD Radeon RX 6900 XTX
GPUNavi 24 (XL)?Navi 24 (XT)?Navi 23 (XL)Navi 23 (XT)Navi 22 (XT?)Navi 21 XLNavi 21 XTNavi 21 XTXNavi 21 XTXHNavi 21 XTXH
Process Node6nm6nm7nm7nm7nm7nm7nm7nm7nm7nm
Die Size107mm2107mm2237mm2237mm2336mm2520mm2520mm2520mm2520mm2520mm2
Transistors5.4 Billion5.4 Billion11.06 Billion11.06 Billion17.2 Billion26.8 Billion26.8 Billion26.8 Billion26.8 Billion26.8 Billion
Compute Units12162832406072808080
Stream Processors768102417922048256038404608512051205120
TMUs/ROPs48/3264/32112/64128/64160/64240 / 96288 / 128320 / 128320 / 128320 / 128
Game Clock2039 MHz2610 MHz2044 MHz2359 MHz2424 MHz1815 MHz2015 MHz2015 MHz2250 MHzTBA
Boost Clock2321 MHz2815 MHz2491 MHz2589 MHz2581 MHz2105 MHz2250 MHz2250 MHz2345 MHz2435 MHz
FP32 TFLOPs3.5 TFLOPs5.7 TFLOPs9.0 TFLOPs10.6 TFLOPs13.21 TFLOPs16.17 TFLOPs20.74 TFLOPs23.04 TFLOPs24.01 TFLOPs24.93 TFLOPs
Memory Size4 GB GDDR6 + 16 MB Infinity Cache4 GB GDDR6 + 16 MB Infinity Cache8 GB GDDR6 + 32 MB Infinity Cache8 GB GDDR6 + 32 MB Infinity Cache12 GB GDDR6 + 96 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache
Memory Bus64-bit64-bit128-bit128-bit192-bit256-bit256-bit256-bit256-bit256-bit
Memory Clock14 Gbps18 Gbps14 Gbps16 Gbps16 Gbps16 Gbps16 Gbps16 Gbps18 Gbps18 Gbps
Bandwidth112 GB/s144 GB/s224 GB/s256 GB/s384 GB/s512 GB/s512 GB/s512 GB/s576 GB/s576 GB/s
Price$149 US?$199 US$329 US$379 US$479 US$579 US$649 US$999 US~$1199 US~$1199 US

Products mentioned in this post

AMD Radeon RX 6900 XT
AMD Radeon RX 6900 XT
USD 1899.66
GeForce RTX 3090
GeForce RTX 3090
USD 3033.29
rtx 3090
rtx 3090
USD 2598

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