The proliferation of PCIe 5.0 has driven a leap in graphics card performance, but it also imposes stricter demands on power supply systems. The AMD Radeon RX 9070 XT, as a flagship PCIe 5.0-compatible graphics card, features a dual 8-pin power design that contrasts sharply with the 12VHPWR connector of the ATX 3.0 standard. According to Tom's Hardware testing, the RX 9070 XT draws 304W at stock and up to 329W under overclocking. Dual 8-pin connectors, capable of delivering 375W (150W per 8-pin + 75W from the PCIe slot), comfortably meet these requirements. However, the ATX 3.0-compliant 12VHPWR connector supports up to 600W and introduces transient power protection (200% peak load for 100μs), critical for stability under extreme loads.
Test Platform:
CPU: AMD Ryzen 9 9900X (overclocked to 5.5GHz)
Motherboard: ASUS ROG Strix X670E-F Gaming
Memory: G.Skill Trident Z5 DDR5-6400 32GB × 2
Storage: Samsung 990 Pro 2TB
Graphics Card: AMD Radeon RX 9070 XT (reference/overclocked)
Power Supplies:
ATX 3.0 Group: GAMEMAX RGB1050 Pro (1050W Platinum, 12VHPWR), GAMEMAX RGB-Smart 1300 Pro (1300W Platinum, 12VHPWR)
Non-ATX 3.0 Group: GAMEMAX GT-450G Gold (450W Gold, dual 8-pin), GAMEMAX GS SFX Gold 650W (650W Gold, dual 8-pin)
Test Scenarios:
Benchmark Tests: 3DMark Time Spy Extreme, Unigine Superposition 8K
Game Performance: Cyberpunk 2077 4K Ray Tracing, Black Myth: Wukong 4K Ultra
Overclocking Stress: Manual overclock to 2600MHz (power consumption increased to 360W)
Transient Power Testing: Oscilloscope recording of GPU instantaneous power fluctuations
ATX 3.0 PSUs:
GAMEMAX RGB1050 Pro: 12V voltage fluctuation ±0.5%, temperature 38°C
GAMEMAX RGB-Smart 1300 Pro: 12V voltage fluctuation ±0.3%, temperature 35°C
Non-ATX 3.0 PSUs:
GAMEMAX GT-450G Gold: 12V voltage fluctuation ±1.2%, temperature 48°C
GAMEMAX GS SFX Gold 650W: 12V voltage fluctuation ±1.0%, temperature 45°C
Conclusion: ATX 3.0 PSUs excel in voltage stability and thermal control, with minimal fluctuations under high load.
| Test Scenario | ATX 3.0 PSU (GAMEMAX RGB1050 Pro) | Non-ATX 3.0 PSU (GAMEMAX GT-450G Gold) |
|---|---|---|
| Cyberpunk 2077 4K RT | 82 FPS avg, 65 FPS 1% low | 78 FPS avg, 60 FPS 1% low |
| Black Myth: Wukong 4K Ultra | 95 FPS avg, 82 FPS 1% low | 90 FPS avg, 75 FPS 1% low |
| Analysis: ATX 3.0 PSUs boost frame rate stability by 5-6% in extreme scenarios, especially during complex ray tracing. |
Overclocked State:
ATX 3.0 PSUs: Stable at 360W, GPU core temperature 72°C
Non-ATX 3.0 PSUs: Occasional reboots, temperature 85°C
Transient Power Data:
Peak power: ATX 3.0 PSUs 580W (80μs), Non-ATX 3.0 PSUs 520W (50μs)
Conclusion: ATX 3.0 PSUs offer superior overclocking stability and transient power support, eliminating bottlenecks in non-ATX 3.0 models.
Cable Quality Impact:
Third-party adapters may exceed 90°C at 500W (TechPowerUp testing). Use GAMEMAX’s native 16AWG silver-plated cables, which reduce resistance by 15% compared to generic options.
PSU Length Constraints:
The 160mm GAMEMAX RGB1050 Pro fits most ATX cases (e.g., GAMEMAX Tianzun supports up to 180mm); always measure your case’s PSU compartment.
ATX 3.0 Necessity Guide:
Casual Users: Non-ATX 3.0 PSUs (e.g., GAMEMAX GT-450G Gold) suffice for basic needs.
Overclockers: ATX 3.0 PSUs (e.g., GAMEMAX RGB-Smart 1300 Pro) ensure peak stability.
ATX 3.0 Adoption Status:
ATX 3.0 PSUs are projected to account for 35% of the market by 2025 (Verified Market Reports), though mainstream users still favor non-ATX 3.0 models.
Value-for-Money Choices:
Budget Builds: GAMEMAX GT-450G Gold (450W) with dual 8-pin adapter support, ideal for ITX systems.
High-End Needs: GAMEMAX RGB-Smart 1300 Pro Platinum supports triple 8-pin parallel for future-proofing.
Long-Term Compatibility:
As PCIe 5.0 GPUs evolve to higher power limits, ATX 3.0 PSUs provide better scalability.
Casual Users: Non-ATX 3.0 PSUs (e.g., GAMEMAX GT-450G Gold) offer excellent value for most use cases.
Overclocking Enthusiasts: ATX 3.0 PSUs (e.g., GAMEMAX RGB1050 Pro) unlock full GPU potential, especially in transient power scenarios.
Future-Proofing: ATX 3.0 is the safer bet for long-term PCIe 5.0 GPU ownership.
This testing confirms robust compatibility between the RX 9070 XT and ATX 3.0 PSUs. While non-ATX 3.0 models perform adequately in standard scenarios, ATX 3.0 sets a new benchmark for reliability in high-performance environments. As an official AMD-recommended brand, GAMEMAX’s ATX 3.0 solutions not only meet technical demands but also enhance user experience with features like 10-year warranties and intelligent cooling (e.g., 140mm ARGB fans), making them the top choice for stability and forward-thinking builds.
