- Aug 17, 2014
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 / SP 5,120 5,120 RT Cores 80 80 Ray Accelerators 80 80 Texture Units 320 320 Base Clock Rate ? 1,825 MHz Game Clock Rates 2,250 MHz 2,015 MHz Boost Clock Rate 2,435 MHz 2,250 MHz Memory Capacity 16GB GDDR6 16GB GDDR6 Memory Speed 18 Gbps 16 Gbps Memory Bus 256-bit 256-bit Memory Bandwidth 576 Gbps 512 GBps ROPs 128 128 L2 Cache 4MB 4MB L3 Cache 128MB 128MB TDP ? 300W Transistor Count 26.8 billion 26.8 billion Die Size 536 mm² 536 mm² MSRP ? $999*Specifications are unconfirmed.