Specifications
Type
Geared Current Multiplier (GCM) — vertical power delivery (VPD)
Current Density
Greater than 3.0 A/mm²
Current Gain
Greater than 40
Reachable Density
Up to 2 A/mm² cited for GCM VPD roadmap
PDN Resistance
About 10 µΩ for a 1,200 A design
PDN Loss
Fewer than 14.4 W at 1,200 A
Placement
Vertically stacked under the processor through a gearbox capacitor network
Pin Mapping
Processor-specific pin map via capacitor network
Input
48 V direct-to-load
Architecture
Factorized Power Architecture (FPA)
Target
AI accelerators, GPU/CPU/ASIC (XPU) and custom silicon
Vendor
Vicor Corporation
Overview
The Vicor GCM (Geared Current Multiplier) is a specialised vertical power delivery embodiment that stacks power converters directly under a processor, feeding current through a gearbox capacitor network geared to a processor-specific pin map.
Vertical power delivery lifts current density above 3.0 A/mm² with current gains greater than 40 — both figures matter, because without high levels of each, trade-offs raise power losses. A 1,200 A design can reach a PDN resistance of only about 10 µΩ, translating to fewer than 14.4 W of loss.
The approach complements Vicor's lateral and lateral-vertical power delivery techniques, where 70% of the power is delivered laterally and 30% through a current multiplier on the bottom side of the processor, cutting PDN loss by roughly four times.
Vicor's Factorized Power Architecture underpins all of these topologies, separating regulation from voltage transformation so that 48 V can be delivered to the processor point of load.
Key Benefits
Vertical power delivery for the highest-current AI compute. Greater than 3.0 A/mm² and greater than 40× current gain enable PDN resistances near 10 µΩ, which is what next-generation accelerator sockets require.
Applications
Next-generation AI accelerator and custom XPU power delivery; high-current GPU/CPU sockets; vertical and hybrid lateral-vertical power delivery boards.
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