PCIe Gen 5 means the PSU complies with ATX3.0?
Choose a right PSU for your PCIe Gen 5 graphic card.
In 2019, PCI Special Interest Group (PCI-SIG) announced the change of the new interface (12VHPWR) of PCIe Gen 5. Therefore the new generation of graphic card connector must be designed according to the new PCIe Gen 5 interface. Intel® observed the trends of the increasing power demands of new graphic cards, and made an unprecedented change in the PSU design guide in the past 20 years, that is ATX3.0. Let’s see what PSU requirements will be needed for ATX3.0 standard.
CPU Peak Current Increased
| PSU 12V2 Capability Recommendations | |||
|---|---|---|---|
| PSDG V1.43 | PSDG V2.0 | ||
| Processor TDP | Continuous Current | Peak Current | Peak Current |
| 165W | 37.5A | 40A | 40A |
| 125W | 26A | 34A | 39A |
| 65W | 23A | 30A | 34A |
| 35W | 13A | 16.5A | 19A |
Please click here to know more about FSP ATX3.0 PSUs.
Broader Load Regulation
Limits for the +12V Rail (From ±5% to +5 ~ -7%)
| PSDG V1.43 | PSDG V2.0 | |||
|---|---|---|---|---|
| Output | Range | Min | Range | Min |
| +12V1DC | ±5% | +11.40 | +5% / -7% | +11.20 |
| +12V2DC | ±5% | +11.40 | +5% / -7% | +11.20 |
Please click here to know more about FSP ATX3.0 PSUs.
The Maximum Step Size Increased
Especially the +12V which connected to the graphic card surged from 100% to 300%
| PSDG V1.43 | PSDG V2.0 | |
|---|---|---|
| Output | Maximum Step Size (% of Rated Output Amps) | Maximum Step Size (% of Rated Output Amps) |
| +12V1DC | 40% (Required) 70% (Recommended) | 40% (Required) 70% (Recommended) |
| +12V2DC | 85% | 85% of CPU supported in Intel PSDG Table 2-12 |
| +12V3/4 | 80% (Recommended) | Steps from 100% > 300% 30% > 100% |
| +5VDC | 30% | 30% |
| +3.3VDC | 30% | 30% |
Please click here to know more about FSP ATX3.0 PSUs.
Power-on time
The speed should be less than 200ms
| PSDG V1.43 | PSDG V2.0 | |
|---|---|---|
| Description | Required | Required |
| Power-on time | < 500 ms | < 200 ms |
| PWR_OK delay | 100-500 ms | 100 ms – 250ms |
Please click here to know more about FSP ATX3.0 PSUs.
Power Excursion
Increased tolerance for high power spikes, for the compatible PSU platforms. For 450W PSU, up to 200% of the PSU's rated power for 100μs with a 10% duty cycle. For less than 450W, 150% PSU’s rated power could be delivered at maximum.
| Power Excursion % of PSU Rated Size PSU ≤ 450 Watts & PSUs without 12VHPWR Connector | Power Excursion % of PSU Rated SizePSU > 450 Watts & 12VHPWR Connector present | Time for Power Excursion | Testing Duty Cycle |
|---|---|---|---|
| 100% | 100% | Infinite | -- |
| 110% | 120% | 100 ms | 25% |
| 135% | 160% | 10 ms | 12.5% |
| 145% | 180% | 1 ms | 8% |
| 150% | 200% | 100 µs | 5% |
Please click here to know more about FSP ATX3.0 PSUs.
Support A New 12VHPWR Connector
The PCIe Gen 5 (12+4) pin connector and the 12+4 pin cable.
- Rated current up to 9.2A per contact with all 12 power contacts.
- The 12VHPWR connector that uses 16AWG wires (600W).
- Fully isolated terminals.
Please click here to know more about FSP ATX3.0 PSUs.
