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The JEDEC organization has published specifications for the GDDR7 memory standard. GDDR7 is expected to become the memory of choice for high-end RDNA 4 and Blackwell GPUs, which are rumored to be released next year and will compete for a place in the list of the best graphics cards.
It's been almost six years since the first video cards began supporting GDDR6 memory. It was the RTX 20 series with Turing architecture from Nvidia, which entered the market in September 2018, reports Tom’s Hardware. The first RTX 2080 and RTX 2080 Ti GPUs with GDDR6 had 14 Gbps of memory bandwidth, delivering 56 GB/s per device. Later solutions such as the AMD RX 7900 XTX have up to 20 Gbps (80 GB/s).
Nvidia helped create a faster alternative in GDDR6X, which started at 19 Gbps in the RTX 3080 and eventually reached 23 Gbps in the newest RTX 4080 Super. Micron officially rates its GDDR6X chips at 24 Gbps, which translates to 96 GB/s per device.
GDDR7 should provide significant increases in throughput across generations. The JEDEC specification will eventually reach 192 Gbps per device. This means 48Gbps of memory bandwidth, twice the speed of the fastest GDDR6X. However, this memory achieves these speeds in a different way than previous memory solutions.
GDDR7 uses three signal levels (-1, 0, +1) to transfer three bits of data in two cycles. This is in contrast to the NRZ (non-return to zero) signaling used in GDDR6, which transmitted two bits per two cycles. This change alone provides a 50% improvement in data transfer efficiency, which means the base clock speed does not need to be twice that of GDDR6.
Other changes include the use of kernel-independent linear feedback shift register training patterns to improve accuracy and reduce training time. GDDR7 will have twice as many independent channels (four versus two for GDDR6) and will use PAM3.
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