Antec ISK300-150 Case Review

Main Specifications

Please read our article Hardware Secrets Power Supply Test Methodology to understand our power supply testing methodology.

We tested this power supply with five different load patterns, trying to pull around 20%, 40%, 60%, 80%, and 100% of its labeled maximum capacity (actual percentage used listed under “% Max Load”), watching how the reviewed unit behaved under each load. In the table below we list the load patterns we used and the results for each load.

If you add all the power listed for each test, you may find a different value than what is posted under “Total” below. Since each output can vary slightly (e.g., the +5 V output working at +5.10 V), the actual total amount of power being delivered is slightly different than the calculated value. On the “Total” row we are using the real amount of power being delivered, as measured by our load tester.

The +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test both inputs were connected to the power supply single rail (+12VB input was connected to the power supply ATX12V connector and all other cables were connected to the load tester +12VA input).

Input	Test 1	Test 2	Test 3	Test 4	Test 5
+12VA	1 A (12 W)	2 A (24 W)	3 A (36 W)	4 A (48 W)	5.25 A (63 W)
+12VB	1 A (12 W)	1.5 A (18 W)	2.75 A (33 W)	4 A (48 W)	5 A (60 W)
+5V	1 A (5 W)	1 A (5 W)	1.5 A (7.5 W)	1.5 A (7.5 W)	2 A (10 W)
+3.3 V	1 A (5 W)	1 A (5 W)	1.5 A (4.95 W)	1.5 A (4.95 W)	2 A (6.6 W)
+5VSB	1 A (5 W)	1 A (5 W)	1 A (5 W)	1 A (5 W)	1 A (5 W)
-12 V	0.5 A (6 W)	0.5 A (6 W)	0.5 A (6 W)	0.5 A (6 W)	0.5 A (6 W)
Total	42.6 W	59.9 W	90.5 W	116.0 W	145.6 W
% Max Load	28.4%	39.9%	60.3%	77.3%	97.1%
Room Temp.	26.8° C	29.6° C	29.8° C	30.2° C	31.4° C
PSU Temp.	26.9° C	33.9° C	34.2° C	34.4° C	35.6° C
Voltage Regulation	Pass	Pass	Pass	Pass	Pass
Ripple and Noise	Pass	Pass	Pass	Pass	Pass
AC Power	66.5 W	85.8 W	124.2 W	154.9 W	193.1 W
Efficiency	64.1%	69.8%	72.9%	74.9%	75.4%
AC Voltage	116.9 V	115.4 V	115.4 V	115.2 V	114.8 V
Power Factor	0.987	0.992	0.996	0.997	0.998
Final Result	Pass	Pass	Pass	Pass	Pass

The power supply from Antec ISK300-150 can really deliver 150 W, but it is important to notice that we relaxed on the room temperature, since this is a low-wattage model that is hard to heat.

The main problem with this power supply is efficiency: below 80% all the time.

Voltages were always within their allowed range and noise and ripple was always below the maximum allowed. You can see noise levels during test five below. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All numbers are peak-to-peak figures.

Figure 16: +12VA input from load tester at 145.6 W (54.4 mV).

Figure 17: +12VB input from load tester at 145.6 W (54.4 mV).

Figure 18: +5 V rail with power supply delivering 145.6 W (18.2 mV).

Figure 19: +3.3 V rail with power supply delivering 145.6 W (9.4 mV).