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

Hassan Mujtaba
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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 6950 XTAMD Radeon RX 6900 XTAMD Radeon RX 6800 XTAMD Radeon RX 6800AMD Radeon RX 6750 XTAMD Radeon RX 6700 XTAMD Radeon RX 6700AMD Radeon RX 6650 XTAMD Radeon RX 6600 XTAMD Radeon RX 6600AMD Radeon RX 6500 XTAMD Radeon RX 6400
GPUNavi 21 KXTXNavi 21 XTXNavi 21 XTNavi 21 XLNavi 22 KXTNavi 22 XTNavi 22 XLNavi 23 KXTNavi 23 (XT)Navi 23 (XL)Navi 24 (XT)Navi 24 (XL)
Process Node7nm7nm7nm7nm7nm7nm7nm7nm7nm7nm6nm6nm
Die Size520mm2520mm2520mm2520mm2336mm2336mm2336mm2237mm2237mm2237mm2107mm2107mm2
Transistors26.8 Billion26.8 Billion26.8 Billion26.8 Billion17.2 Billion17.2 Billion17.2 Billion11.06 Billion11.06 Billion11.06 Billion5.4 Billion5.4 Billion
Compute Units808072604040363232281612
Stream Processors51205120460838402560256023042048204817921024768
TMUs/ROPs320 / 128320 / 128288 / 128240 / 96160/64160/64144/64128/64128/64112/6464/3248/32
Game Clock2116 MHz2015 MHz2015 MHz1815 MHz2495 MHz2424 MHz2330 MHz2410 MHz2359 MHz2044 MHz2610 MHz2039 MHz
Boost Clock2324 MHz2250 MHz2250 MHz2105 MHz2600 MHz2581 MHz2495 MHz2635 MHz2589 MHz2491 MHz2815 MHz2321 MHz
FP32 TFLOPs23.80 TFLOPs23.04 TFLOPs20.74 TFLOPs16.17 TFLOPs13.31 TFLOPs13.21 TFLOPs11.50 TFLOPs10.79 TFLOPs10.6 TFLOPs9.0 TFLOPs5.7 TFLOPs3.5 TFLOPs
Memory Size16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache12 GB GDDR6 + 96 MB Infinity Cache12 GB GDDR6 + 96 MB Infinity Cache10 GB GDDR5 + 80 MB Infinity Cache8 GB GDDR6 + 32 MB Infinity Cache8 GB GDDR6 + 32 MB Infinity Cache8 GB GDDR6 + 32 MB Infinity Cache4 GB / 8 GB GDDR6 + 16 MB Infinity Cache4 GB GDDR6 + 16 MB Infinity Cache
Memory Bus256-bit256-bit256-bit256-bit192-bit192-bit160-bit128-bit128-bit128-bit64-bit64-bit
Memory Clock18 Gbps16 Gbps16 Gbps16 Gbps18 Gbps16 Gbps16 Gbps17.5 Gbps16 Gbps14 Gbps18 Gbps14 Gbps
Bandwidth576 GB/s512 GB/s512 GB/s512 GB/s432 GB/s384 GB/s320 GB/s280 GB/s256 GB/s224 GB/s144 GB/s112 GB/s
Price$1099 US$999 US$649 US$579 US$549 US$479 USTBD$399 US$379 US$329 US$199 US$159 US?
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