Silverstone Decathlon DA650: A modular alternative

Test Setup

As usual we are testing with our Chroma programmable loads to fully load each rail to a specific amount. This is important to get truly accurate results and not merely approximate values. The tests are conducted in two different temperature environments. One is normal room temperature of 25-26°C, while the second environment goes from room temperature and increases steadily up to 50°C. Especially during the higher temperatures we will see how good the power supplies are and what they're really made of. Components inside will perform much worse at higher temperatures, but we expect any good quality PSU to deal with such test conditions without failing.

Note: If you would like to know more about our testing methodology, equipment, and environment, please read our PSU testing overview.

DC Output Rails
PSU Load	3.3V Amps	3.3V Wattage	5V Amps	5V Wattage	5Vsb Amps	5Vsb Wattage	12V Amps	12V Wattage	Wattage All Rails
10%	1.45	4.86	1.82	9.16	0.23	1.16	4.16	50.50	66
20%	2.91	9.69	3.63	18.11	0.46	2.31	8.33	100.79	131
30%	4.36	14.34	5.45	26.98	0.69	3.44	12.49	150.51	195
40%	5.81	16.06	7.27	35.62	0.93	4.60	16.65	199.80	256
50%	7.27	23.70	9.08	44.04	1.16	5.71	20.82	248.80	322
60%	8.72	28.17	10.90	52.43	1.39	6.80	24.98	297.51	385
70%	10.17	32.54	12.72	60.67	1.62	7.86	29.15	348.63	450
80%	11.63	36.98	14.53	68.58	1.85	8.94	33.31	394.39	509
90%	13.08	41.20	16.35	76.36	2.08	9.94	37.47	440.95	568
100%	14.53	45.33	18.17	83.76	2.31	10.95	41.64	487.60	628

3.3V DC Output


The 3.3V rail is a bit better at the Decathlon than the Olympia. It drops with increasing load but that doesn't fall under the minimum specified voltage. The decreasing voltage doesn't have much to do with temperatures since the voltage drops are all nearly identical regardless of ambient temperature or input voltage. During transient load testing we have also seen good results. The Decathlon works quite well with changing loads and input voltages. It also showed no problems with a cold start that jumped from 0% to 100% load.

5.0V DC Output


The 5V rail has an outcome similar to that of the Olympia OP650. It's a little bit better but the voltage still drops under the specified limitation of 4.75V when using a 230VAC input at higher ambient temperatures.

5Vsb Output


From the stability point of view it is not a surprise to see a decrease in the 5Vsb rail, but it is still within specifications and shouldn't be a problem.

12V DC Output


The 12V rail is very stable and doesn't even come close to the lower limits. Given that the 12V output is arguably the most important, we are pleased to see that it also provides the best results. Still, Silverstone could work on minimizing voltage drops for all of the output rails.