Seasonic Prime ULTRA Platinum 850W Power Supply Review

1. Introduction2. Bundle & Cabling3. External4. Internal5. Methodology and Testing6. Closing Thoughts7. View All Pages

The Seasonic Prime ULTRA Platinum 850W power supply is finished in simple black paint with silver accenting to reflect on the efficiency. Its a good move for many reasons, one being that its a colour neutral scheme to suit system builders focusing on a particular theme. The quality of finishing is first class as we would expect.

This is how we differentiate between Seasonic's Titanium and Platinum power supplies. The Titanium models have a lovely silver grill covering half of the black. Just plain black for this one.

One side of the power supply is home to the fully packed modular bay which is cleanly split into sections and labelled for ease of install.

The other side of the power supply is home to the power connector, switch and Hybrid mode switch. The rest is honeycomb vented to help ensure there is plenty of air flow.

This Hybrid mode allows the fan to be disabled completely when the unit drops to a specific temperature threshold. Seasonic claim the Hybrid Fanless mode works up to:

• Approximately 50 % (±5 %) of system load at 25 °C.
• Approximately 30 % (±5 %) of system load at 40 °C.

Below we can see the specifications of the power supply. The Model number is SSR-850-PD ULTRA.

Seasonic PRIME ULTRA Platinum 850W Power Supply (SSR-850-PD ULTRA)
DC Output	+3.3V	+5V	+12V	-12V	+5Vsb
Max Output	20A	20A	70A	0.3A	2.5A
Total Power	100W		840W	3.6W	12.5W
	850 Watts

This 1000W  power supply can deliver 70A on the +12V rail. Plenty of power on hand for a powerful SLI and Crossfire configuration.

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