AMD's Liquid-Cooled Radeon RX 6900 XT

silversurfer

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AMD's liquid-cooled Radeon RX 6900 XT appears to be making its way to the retail market. VideoCardz has spotted a Sapphire listing over at a Kabum, a Brazilian retailer.

Speculation around the graphics card world is that the Radeon RX 6900 XT LC could very well be the incarnation of the rumored Radeon RX 6900 XTX. The latter was expected utilize the Navi 21 XTXH silicon, which allegedly brings the highest clock rates out of AMD's RDNA 2 army. Although we've already seen the graphics card in the wild, AMD hasn't formally confirmed the existence of the Radeon RX 6900 XT LC.

The Sapphire Radeon RX 6900 XT LC, which should employ the Navi 21 XTXH die, comes with 80 Compute Units (CUs) for a total of 5,120 Stream Processors (SPs). Along with those 5,120 SPs, you'll also find 80 ray accelerators for ray tracing workloads. The Radeon RX 6900 XT LC arrives with a 2,250 MHz game clock and a boost clock up to 2,435 MHz. The vanilla Radeon RX 6900 XT has a 2,015 MHz game clock and 2,250 MHz boost clock. Therefore, Sapphire's rendition is offering up to 11.7% and 8.2% higher game and boost clocks, respectively.

Besides the uplift in clock speeds, Kabum's specification table also shows an increase in memory speed for the Radeon RX 6900 XT LC. Apparently, the liquid-cooled version sports 18 Gbps GDDR6 memory chips as opposed to the 16 Gbps ones on the Radeon RX 6900 XT. It may be a human error, but it's certainly feasible, considering that Samsung produces 18 Gbps GDDR6 memory chips. If accurate, the extra frequency on the memory chips bumps the Radeon RX 6900 XT LC's maximum theoretical memory bandwidth up to 576 GBps, a 12.5% improvement over the regular version.

AMD Radeon RX 6900 XT LC Specifications​

Radeon RX 6900 XT LC*Radeon RX 6900 XT
Architecture (GPU)RDNA 2 (Navi 21)RDNA 2 (Navi 21)
CUDA Cores / SP5,1205,120
RT Cores8080
Ray Accelerators8080
Texture Units320320
Base Clock Rate?1,825 MHz
Game Clock Rates2,250 MHz2,015 MHz
Boost Clock Rate2,435 MHz2,250 MHz
Memory Capacity16GB GDDR616GB GDDR6
Memory Speed18 Gbps16 Gbps
Memory Bus256-bit256-bit
Memory Bandwidth576 Gbps512 GBps
ROPs128128
L2 Cache4MB4MB
L3 Cache128MB128MB
TDP?300W
Transistor Count26.8 billion26.8 billion
Die Size536 mm²536 mm²
MSRP?$999
*Specifications are unconfirmed.
 

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AMD Launches Radeon RX 6900 XT Liquid Cooled​

AMD on Wednesday unveiled a version of its flagship Radeon RX 6900 XT graphics card equipped with a closed-loop liquid cooling system (LCS). The new board boasts higher GPU and memory frequencies compared to AMD's reference air-cooled card, which is already among the best graphics cards, but it will (at least initially) be available exclusively to system integrators.

AMD's Radeon RX 6900 XT Liquid Cooled carries the company's Navi 21 GPU with 5120 stream processors that is clocked at up to 2250 MHz (game clock) and is accompanied with 16GB of 18Gbps GDDR6 memory. There are some Radeon RX 6900 XT graphics cards from manufacturers that have a higher GPU clock, but AMD's RX 6900 XT Liquid Cooled model is the only one to feature 18Gbps DRAM.
 
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