Samsung Develops 512 GB DDR5 Memory Modules Running at 7.2 Gbps

TokyoQuaSaR · Oct 12, 2021

ARF said:
It is simple, basic Maths. Just divide by 2, or by 4, or by 8 depending on the memory standard.

Basically divide only by 2, there is only DDR memory in the market, we don't see QDR except in rare embedded applications and I don't think that there is any memory standard with 8 data per cycle per pin.

Wirko · Oct 12, 2021

TokyoQuaSaR said:
Basically divide only by 2, there is only DDR memory in the market, we don't see QDR except in rare embedded applications and I don't think that there is any memory standard with 8 data per cycle per pin.

If I understand the available data correctly, it should be 4 for GDDR6X. There are two data transfers per clock period, and two bits per transfer, as PAM4 is employed.

GDDR6, on the other hand, can operate either at double or quad data rate (the latter requires halving the clock frequency, WCK). Check out this document from Micron, page 11.

Anyone (old enough) want to calculate the baud rates?

TokyoQuaSaR · Oct 13, 2021

Wirko said:
If I understand the available data correctly, it should be 4 for GDDR6X. There are two data transfers per clock period, and two bits per transfer, as PAM4 is employed.

GDDR6, on the other hand, can operate either at double or quad data rate (the latter requires halving the clock frequency, WCK). Check out this document from Micron, page 11.

Anyone (old enough) want to calculate the baud rates?

I guess you're right, totally forgot about the GDDR5-6X with PAM4 indeed. But well it's not like we can choose it separately anyway.
Baud rate in this case should be half the bit rate (10GBaud for GDDR6X 20Gb/s).

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System Name	Deneb
Processor	AMD Ryzen 7 7800X3D
Motherboard	Asus ProArt X670E-Creator WiFi
Cooling	CPU: Noctua D15. Case additional : ML140 Pro blue PWM (400-2000) x1, ML140 Pro RGB PWM (400-1200) x2
Memory	G.Skill Flare X5 DDR5 6000Mbps EXPO 2x16Go
Video Card(s)	Geforce RTX 4070 Asus Dual 12Go
Storage	SSD Solidigm (SK Hynix) P44 Pro 2To (Gen4). HDD WD80EAZZ (8To, CMR) x2 in AMD RAID1
Display(s)	Asus VG27AQ 27" 1440p 165Hz ELMB Sync, Freesync/Gsync compatible
Case	Fractal Design R6 Tempered Glass Black
Audio Device(s)	Motherboard soundcard. Logitech Z623 2.1 THX speakers.
Power Supply	Corsair RMx 2018 850W
Mouse	Logitech G502
Keyboard	Filco Majestouch Convertible 2 (USB/BT) TKL Cherry blue
Software	Windows 11 Pro
Benchmark Scores	Cinebench R23 18440, Geekbench 6 CPU 2671/14823, GPU 181588, 3DMark Speedway 4723, Steel Nomad 4019