The Corsair TX650 allows a higher load on the +3.3V and +5V rails than the other PSUs based on the same platform we’ve tested earlier: up to 30 rather than 25 amperes for each voltage. The rest of the specs are familiar. The PSU can yield almost all of its output power via the +12V rail. It is 80 PLUS Bronze certified.
Working together with our APC SmartUPS SC 620, the PSU was stable at loads up to 387 watts when powered by the mains but couldn’t switch to the UPS’s batteries even at 280 watts.
Cross-Load Voltage Stability
The +12V voltage is perfect, always staying within 1% of the required level.
The other two voltages are within 2%. The Corsair TX650 is exemplary in this test.
Output Voltage Ripple
The output voltage ripple, both high- and low-frequency, is within the permissible range, just like with the other Corsair PSUs based on the same platform.
Temperature and Noise
The TX650 employs a different fan than what we’ve seen in the GS series. It is a 140mm Yate Loon D14BH-12 model with a rated speed of 2800 RPM.
The regulation algorithm hasn’t changed. The fan is idle at low loads, then turns on for brief periods of time, and then accelerates linearly at loads of 300 watts and higher. The fan reaches 1500 RPM at full load, which is an obvious advantage compared to the GS series which make their fan work at 2000 RPM.
Thus, the Corsair TX650 is quiet at medium loads and average in noisiness at high loads.
Efficiency and Power Factor
The Corsair TX650 is 87.3%, 89.3% and 84.9% efficient at the reference loads of 20%, 50% and 100%, meeting the 80 PLUS Bronze requirements. It lacks efficiency at full load to comply with 80 PLUS Silver. The peak efficiency of 90% was observed at a load of 248 watts.
The standby source copes with its job.
The Corsair TX650 is a quieter alternative to Corsair’s GS series.