Cooler Master Cosmos II: Ultra Tower Case

Cases|Damping
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Test Results: 2 x ATI Radeon HD 4870 (CrossFireX)


2 x HD 4870 CrossFireX test system.

System Measurements
System State
Idle
CPU + GPU Load
System Fan Speeds
Low
Med
High
CPU Temp
34°C
50°C
47°C
44°C
SB Temp
56°C
68°C
66°C
63°C
HD Temp
31°C
31°C
30°C
29°C
GPU #1 Temp
79°C
92°C
90°C
90°C
GPU #1 Fan
Speed
1080 RPM
2350 RPM
2280 RPM
2290 RPM
GPU #2 Temp
69°C
86°C
85°C
83°C
GPU #2 Fan Speed
1000 RPM
1950 RPM
1880 RPM
1730 RPM
SPL@1m
21 dBA
31~32 dBA
31~32 dBA
34 dBA
System Power
193W
528W
526W
526W
CPU fan set to 100% speed.
Ambient temperature: 23°C.

With the rear, top, and front fans set to low speed, our test system idled with reasonably good CPU and hard drive temperatures while the Southbridge was a bit hot at 56°C, an unfortunate consequence of being saddled beside two pieces of hot hardware. The HD 4870's had high idle temperatures too as the stock coolers were spinning at only ~1000 RPM (they don't typically ramp up when idle). At one meter's distance, the noise level was a fairly quiet 21 dBA and the ticking of the front fan was not as audible with the rest of the system turned on.

Pushed on load, the medium speed setting seemed to work best, delivering slightly better temperatures and lower GPU fan speeds then the fans set to low. Best of all, the overall noise level didn't change as the extra cooling allowed the GPU fans to slow down. The CPU and Southbridge temperatures rose by 13°C and 10°C respectively compared to idle, while the graphics card heated up to 90°C/85°C. In the this fan configuration, the noise level was measured at 31~32 dBA@1m, which, while loud by our standards, is quite good for our dual HD 4870 configuration. The ticking front fan also blended away into just a slight hum, having been more or less drowned out.



Our HD 4870 CrossFireX test system measured 21 dBA@1m when idle and 31~32 dBA@1m on load.


CrossFireX Configuration Comparison (Load)
Case
Cooler Master Cosmos II
In Win Dragon Rider
In Win BUC
Antec P280
Fans Speeds
top, rear, front @med
top, rear, sides @9V, front @5V
top, rear, front @9V
top, rear, front @low
CPU Temp
46°C
35°C
46°C
45°C
SB Temp
65°C
46°C
63°C
64°C
HD Temp
29°C
31°C
30°C
28°C
GPU #1 Temp
89°C
85°C
89°C
89°C
GPU #1 Fan
Speed
2280 RPM
1890 RPM
2050 RPM
2440 RPM
GPU #2 Temp
84°C
82°C
85°C
84°C
GPU #2 Fan
Speed
1880 RPM
1680 RPM
1780 RPM
1950 RPM
SPL@1m
31~32°C
32 dBA
32~33 dBA
32~33 dBA
CPU fan set to 100% speed.
All temperature results adjusted to 22°C ambient.

Though easily the most expensive case we've tested, from a pure performance standpoint, it fails to capture the crown, beaten out by the brute-force cooling system of the In Win Dragon Rider, with its huge left side fan, and right side fan blowing onto the back of the CPU. However it did edge out both the In Win BUC and Antec P280, producing similar thermal results but with a 1 dB improvement in noise level. This doesn't sound like much, but its a significant amount with our hardware configuration.



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