SAGV Points
SAGV (System Agent Geyserville) is a way by which the processor can dynamically scale the work point (V/F), by applying DVFS (Dynamic Voltage Frequency Scaling) based on memory bandwidth utilization and/or the latency requirement of the various workloads for better energy efficiency at System-Agent. Pcode heuristics are in charge of providing request for Qclock work points by periodically evaluating the utilization of the memory and IA stalls.
SA Speed Enhanced Speed Steps (SA-GV) and Gear Mode Frequencies
| Processor | Technology | Rank Config | DDR Maximum Rate [MT/s] | SAGV-LowBW | SAGV-MedBW | SAGV-HighBW | SAGV- High Performance |
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| U, H | LPDDR5/x Type 3 | 1R | 6400 | 3200 G4 | 6000 G4 | 6400 G4 | 5600 G2 |
| 2R | 6400 | 3200 G4 | 6000 G4 | 6400 G4 | 5600 G2 |
| LPDDR5 Type 4 | 1R | 6400 | 3200 G4 | 6000 G4 | 6400 G4 | 5600 G2 |
| 2R | 6400 | 3200 G4 | 6000 G4 | 6400 G4 | 5600 G2 |
| LPDDR5x Type 4 | 1R | 7467 | 3200 G4 | 4266 G4 | 7467 G4 | 5600 G2 |
| 2R | 7467 | 3200 G4 | 4266 G4 | 7467 G4 | 5600 G2 |
| DDR5 | 1R | 5600 | 3200 G4 | 4800 G4 | 5200 G2 | 5600 G2 |
| 2R | 5600 | 3200 G4 | 4800 G4 | 5200 G2 | 5600 G2 |
| U-Type4 | LPDDR5/x Type 4 VAL | 1R/2R | 6400 | 2133 G4 | 6000 G4 | 6000 G4 | 6400 G4 |
| LPDDR5/x Type 4 3-x-3+ | 1R/2R | 6400 | 2133 G4 | 6000 G4 | 6000 G4 | 6400 G4 |
- Intel® Core™ Ultra Processor supports dynamic gearing technology where the Memory Controller can run at 1:2 (Gear-2 mode) or 1:4 (Gear-4 mode) ratio of DRAM speed. The gear ratio is the ratio of DRAM speed to Memory Controller Clock .
MC Channel Width equal to DDR Channel width multiply by Gear Ratio. - SA-GV modes:
- LowBW- Low frequency point, Minimum Power point. Characterized by low power, low BW, high latency. The system will stay at this point during low to moderate BW consumption.
- MedBW - Tuned for balance between power & performance.
- HighBW - Characterized by high power, low latency, moderate BW also used as RFI mitigation point.
- MaxBW/Lowest latency Lowest Latency point, peak BW and highest power.
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DDR interfaces emit electromagnetic radiation which can couple to the antennas of various radios that are integrated in the system, and cause radio frequency interference (RFI). The DDR Radio Frequency Interference Mitigation (DDR RFIM) feature is primarily aimed at resolving narrowband RFI from DDR5 and LPDDR5/x technologies for the Wi-Fi* high and ultra-high bands (~5-7 GHz) . By changing the DDR data rate, the harmonics of the clock can be shifted out of a radio band of interest, thus mitigating RFI to that radio. This feature is working with SAGV on, the 3rd SAGV point is used as RFI mitigation point