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GDDR6 vs GDDR6X Memory Comparison

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Technical Specifications: GDDR6X offers up to 21 Gbps data transfer speed, while GDDR6 reaches 16 Gbps
GDDR6 uses NRZ signaling, transmitting one bit per cycle
GDDR6X employs PAM4 signaling, transmitting two bits per cycle
Performance and Power: GDDR6X provides noticeable performance boost in demanding scenarios
GDDR6X consumes more power overall but is more efficient per bit
GDDR6X is primarily used in NVIDIA's high-end cards
Availability and Cost: GDDR6 is more widely available and generally less expensive
GDDR6X is premium priced and used in NVIDIA's top-tier cards
Choice depends on GPU model and target performance level
Future Development: GDDR7 is in development with potential up to 32 Gbps speeds
Other memory types like HBM are improving
Memory choice will continue affecting GPU design and performance