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- Dec 16, 2010
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- State College, PA, US
| System Name | My Surround PC |
|---|---|
| Processor | AMD Ryzen 9 7950X3D |
| Motherboard | ASUS STRIX X670E-F |
| Cooling | Swiftech MCP35X / EK Quantum CPU / Alphacool GPU / XSPC 480mm w/ Corsair Fans |
| Memory | 96GB (2 x 48 GB) G.Skill DDR5-6000 CL30 |
| Video Card(s) | MSI NVIDIA GeForce RTX 4090 Suprim X 24GB |
| Storage | WD SN850 2TB, Samsung PM981a 1TB, 4 x 4TB + 1 x 10TB HGST NAS HDD for Windows Storage Spaces |
| Display(s) | 2 x Viotek GFI27QXA 27" 4K 120Hz + LG UH850 4K 60Hz + HMD |
| Case | NZXT Source 530 |
| Audio Device(s) | Sony MDR-7506 / Logitech Z-5500 5.1 |
| Power Supply | Corsair RM1000x 1 kW |
| Mouse | Patriot Viper V560 |
| Keyboard | Corsair K100 |
| VR HMD | HP Reverb G2 |
| Software | Windows 11 Pro x64 |
| Benchmark Scores | Mellanox ConnectX-3 10 Gb/s Fiber Network Card |
I'm having trouble reconciling how the GPU database determines the clock speed from the transfer rate for GDDR7. I'm looking at the GDDR7 graphics cards, and I can't determine how the clock speed is calculated from the transfer rate.
Note: it's not important whether these are the actual clock speeds these cards will ship at. I'm simply looking at the conversion between transfer rate and clock speed.
I thought the transfer rate should be 8x the clock speed (like GDDR6) * 1.5 (due to PAM3) but the GPU database is using some other factor I cannot figure out. Can someone explain why my calculation is incorrect?
Here's a sample of some of the entries in the GPU database and my calculations:
Note: it's not important whether these are the actual clock speeds these cards will ship at. I'm simply looking at the conversion between transfer rate and clock speed.
I thought the transfer rate should be 8x the clock speed (like GDDR6) * 1.5 (due to PAM3) but the GPU database is using some other factor I cannot figure out. Can someone explain why my calculation is incorrect?
Here's a sample of some of the entries in the GPU database and my calculations:
| Card | Reported memory transfer rate | Reported memory clock speed | My calculated memory clock speed |
| RTX 5090 | 28 Gbps | 2209 MHz | 2333 MHz |
| RTX 5080 | 30 Gbps | 2366 MHz | 2500 MHz |
| RTX 5060 | 22.2 Gbps | 1750 MHz | 1850 MHz |