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Test Results: 2 x ATI Radeon HD 4870 (CrossFireX)
2 x HD 4870 CrossFireX test system.
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System Measurements
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System State
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Idle
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CPU + GPU Load
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System Fan Speeds
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Low
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Med
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High
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CPU Temp
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34°C
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50°C
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47°C
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44°C
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SB Temp
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56°C
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68°C
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66°C
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63°C
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HD Temp
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31°C
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31°C
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30°C
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29°C
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GPU #1 Temp
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79°C
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92°C
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90°C
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90°C
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GPU #1 Fan
Speed
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1080 RPM
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2350 RPM
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2280 RPM
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2290 RPM
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GPU #2 Temp
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69°C
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86°C
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85°C
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83°C
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GPU #2 Fan Speed
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1000 RPM
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1950 RPM
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1880 RPM
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1730 RPM
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SPL@1m
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21 dBA
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31~32 dBA
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31~32 dBA
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34 dBA
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System Power
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193W
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528W
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526W
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526W
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CPU fan set to 100% speed.
Ambient temperature: 23°C.
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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.
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CrossFireX Configuration Comparison (Load)
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Case
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Cooler Master Cosmos II
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In Win Dragon Rider
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In Win BUC
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Antec P280
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Fans Speeds
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top, rear, front @med
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top, rear, sides @9V, front @5V
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top, rear, front @9V
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top, rear, front @low
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CPU Temp
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46°C
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35°C
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46°C
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45°C
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SB Temp
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65°C
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46°C
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63°C
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64°C
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HD Temp
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29°C
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31°C
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30°C
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28°C
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GPU #1 Temp
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89°C
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85°C
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89°C
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89°C
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GPU #1 Fan
Speed
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2280 RPM
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1890 RPM
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2050 RPM
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2440 RPM
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GPU #2 Temp
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84°C
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82°C
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85°C
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84°C
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GPU #2 Fan
Speed
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1880 RPM
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1680 RPM
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1780 RPM
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1950 RPM
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SPL@1m
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31~32°C
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32 dBA
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32~33 dBA
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32~33 dBA
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CPU fan set to 100% speed.
All temperature results adjusted to 22°C ambient.
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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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