SAGV Points
SAGV (System Agent Geyserville) is a way by which they SoC 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.heuristics are in charge of providing request for 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 | DDR Maximum Rate [MT/s] | SAGV-LowBW | SAGV-MedBW | SAGV-HighBW | SAGV- MaxBW/ lowest latency |
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| Processor4,5 S/S refresh/HX | DDR4 | 3200 | 2133 G2 | 2666 G1 | 2933 G1 | 3200 G1 |
| DDR5 1DPC 2R UDIMM / SODIMM | 5200 | 2000 G2 | 3600 G2 | 4800 G2 | 5200 G2 |
| DDR5 1DPC 1R UDIMM /SODIMM | 5600 | 2000 G2 | 3600 G2 | 5200 G2 | 5600 G2 |
| DDR5 1DPC 2R UDIMM S-Refresh only 7 | 5600 | 2000 G2 | 3600 G2 | 5200 G2 | 5600 G2 |
| DDR5 1DPC on 2DPC UDIMM S only | 4400 | 2000 G2 | 3600 G2 | 4000 G2 | 4400 G2 |
| DDR5 1DPC on 2DPC SODIMM (HX only) | 4000 | 2000 G2 | 3600 G2 | 3600 G2 | 4000 G2 |
| Processor4,5 HX Refresh | DDR5 1DPC on 2DPC 1R SODIMMHX Refresh only 7 | 4400 | 2000 G2 | 3600 G2 | 4000 G2 | 4400 G2 |
| DDR56,7 2DPC 1R/1R HX Refresh only | 4400 | 2000 G2 | 3600 G2 | 4000 G2 | 4400 G2 |
| DDR56,7 2DPC 2R/2R HX Refresh only | 4000 | 2000 G2 | 3600 G2 | 3600 G2 | 4000 G2 |
| Processor4,5 S/S refresh/HX | DDR56 2DPC 1R/1R | 4000 | 2000 G2 | 3600 G2 | 3600 G2 | 4000 G2 |
| DDR56 2DPC 2R/2R | 3600 | 2000 G2 | 3200 G2 | 3200 G2 | 3600 G2 |
| Processor 5 H/P/U/U-Refresh | LPDDR4x | 4266 | 2666 G4 | 3733 G4 | 4266G4 | 4266 G2 |
| LPDDR5/x 1R PCB T4 | 6400 | 2400 G4 | 6000 G4 | 6400 G4 | 5200 G2 |
| LPDDR5/x 2R PCB T4 Refresh only 7 | 6400 | 2400 G4 | 6000 G4 | 6400 G4 | 5200 G2 |
| LPDDR5/x 2R PCB T4 | 6000 | 2400 G4 | 5600 G4 | 6000 G4 | 5200 G2 |
| LPDDR5 2R PCB T3 | 4800 | 2400 G4 | 4400 G4 | 4800 G4 | 4800 G2 |
| LPDDR5 1R PCB T3 LPDDR5x 1R/2R PCB T3 | 5200 | 2400 G4 | 4400 G4 | 5200 G4 | 4800 G2 |
| DDR4 | 3200 | 2133 G2 | 2933 G2 | 3200 G2 | 2666 G1 |
| DDR5 | 5600 | 2000 G2 | 3600 G2 | 5200 G2 | 5600 G2 |
| DDR5 | 5200 | 2000 G2 | 3600 G2 | 4800 G2 | 5200 G2 |
- The Processor supports dynamic gearing technology where the Memory Controller can run at 1:1 (Gear-1, Legacy mode) or 1:2 (Gear-2 mode) and 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, low BW and highest power.
- Intel® System Agent Enhanced Speed Step® is not enabled for S/S Refresh-Processor 125W SKU
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SAGV point may change based on memory module Type. - On mixed module type configurations, the selected SAGV point will be the set to the lower frequency configuration.
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