Phanteks Enthoo Primo: Giant Tower Case

Cases|Damping
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TEST RESULTS: DUAL RADEON HD 4870 CONFIGURATION

As an enthusiast case with massive size, it didn't seem likely that anyone would purchase it for use with a single video card, so we jumped straight into our CrossFireX test configuration.

System Measurements (2 x HD 4870)
System State
Idle
CPU + GPU Load
System Fan Speeds
500 RPM
800 RPM
1000 RPM
CPU Temp
34°C
50°C
46°C
44°C
SB Temp
60°C
69°C
67°C
67°C
HD Temp
33°C
32°C
30°C
29°C
GPU #1 Temp
79°C
91°C
91°C
91°C
GPU #1 Fan
Speed (auto)
1090 RPM
2330 RPM
2370 RPM
2360 RPM
GPU #2 Temp
68°C
86°C
85°C
84°C
GPU #2 Fan
Speed (auto)
990 RPM
2000 RPM
1940 RPM
1850 RPM
SPL@1m
20~21 dBA
32 dBA
33 dBA
34~35 dBA
System Power (AC)
192W
525W
525W
525W
CPU fan set to 100% speed.
Ambient temperature: 22°C.

Idle temperatures were fairly comfortable with the exception of the chipset which resides in an unfortunate position, straddled by the two hottest components in the case, a pair of Radeon HD 4870's. Still, with GPU fan speeds of about 1,100 and 1,000 RPM, and the case fans at just 500 RPM, the overall system noise level was fairly quiet.

We tested the system on load with three different case fan speeds: 500, 800, and 1,000 RPM. Going from 500 to 800 RPM produced the best mix of performance and noise. It cooled down the CPU and Southbridge/hard drive by 4°C and 2°C at the cost of 1 dB. Moving to 1,000 RPM generated a much smaller improvement that wasn't worthwhile.

Interestingly, the system fan speeds had little effect on the cooling of the upper graphics card (GPU #1). It stayed at the same temperature and roughly the same fan speed throughout, though the card below it did see some minor relief. GPU #2 ran a little bit cooler and its fan slightly slower with each system fan speed increase. We surmise that the intake fans provided cooler air for GPU #2 but none of it reached GPU #1 as the front and bottom fans aren't positioned high enough to have a direct effect on the top card.


CrossFireX Configuration Comparison (Load)
Case
SilverStone Fortress FT04
CM Cosmos II
Antec P280
Phanteks Enthoo Primo
Fans Speeds
fronts at 500 RPM
top, rear, front on med
top, rear, front on low
top, rear, fronts, bottom at 800 RPM
CPU Temp
42°C
46°C
45°C
46°C
SB Temp
69°C
65°C
64°C
67°C
HD Temp
30°C
29°C
28°C
30°C
GPU #1 Temp
88°C
89°C
89°C
91°C
GPU #1 Fan
Speed (auto)
2150 RPM
2280 RPM
2440 RPM
2370 RPM
GPU #2 Temp
84°C
84°C
84°C
85°C
GPU #2 Fan
Speed (auto)
1930 RPM
1880 RPM
1950 RPM
1940 RPM
SPL@1m
[right side]
30 dBA
[30~31 dBA]
31~32°C
32~33 dBA
33 dBA
CPU fan set to 100% speed.
All temperature results adjusted to 22°C ambient.

At our optimal system fan speed, the Enthoo Primo produced internal load temperatures similar to Cosmos II and Antec P280, but with a higher noise level than either one. It is somewhat disappointing given the P280's much smaller size, but much of the Primo's extra space is reserved for a watercooling system which isn't part of our testing procedures. All that allotted space sits empty, making the Primo's fans and overall cooling strategy less effective.



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