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Test Results - Configuration #2 (CrossFireX)
Case with test system installed (2 x HD 4870 in CrossFireX). |
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System Measurements (CrossFireX)
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Active System Fans
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top, rears
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top, rears, front (center)
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top, rears, side, front (center)
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Noise
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32 dBA
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31~32 dBA
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32 dBA
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CPU Temp
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49°C
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48°C
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46°C
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SB Temp
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64°C
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63°C
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62°C
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HD Temp
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33°C
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29°C
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28°C
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GPU #1 Temp
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91°C
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87°C
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88°C
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GPU #1 Fan
Speed
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2325 RPM
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2110 RPM
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2290 RPM
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GPU #2 Temp
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86°C
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84°C
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83°C
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GPU #2 Fan
Speed
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1960 RPM
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1910 RPM
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1850 RPM
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Testing conducting with both CPU + GPU load applied.
CPU fan set to 100% speed, active system fans set to Low or min. speed.
Ambient temperature: 24°C. AC power draw: 531~537W.
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The 5 fans we had been testing on Low seem to be a good match
for our CrossFireX configuration as the noise level remained effectively the
same whether 3, 4, or 5 of the fans were turned on. We decided not to crank
any of the fans to Medium as the various temperatures were good enough and 31~32
dBA was already too loud.
Again, turning on the front fan resulted in a healthy improvement
to hard drive and GPU temperature and in fact allowed the GPU fan to spin 200
RPM slower. The addition of the side fan seemed to help the CPU temperature
more than anything, but only slightly. It remained mostly ineffective as it
did in our single video card configuration.
Comparisons
As before, the Twelve Hundred's performance was compared with several other cases that were tested with the same components, except for the power supply. Silverstone's Raven got added to the mix as it was tested with 4870s in CrossFireX, while the Silverstone Fortress FT01 was omitted because it was only tested with one 4870.
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CrossFireX Configuration Comparison (Load)
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Case
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Silverstone Raven
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P183*
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Nine Hundred Two
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Twelve Hundred*
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Active System Fans
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CPU + Sys
Fans at full Speed
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rear, front
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rear, front
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top, rears
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top, rears, front, side
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Noise Level
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29 dBA
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35 dBA
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38 dBA
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32 dBA
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31~32 dBA
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CPU Temp
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56°C
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58°C
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53°C
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49°C
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46°C
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SB Temp
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60°C
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69°C
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64°C
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64°C
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61°C
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HD Temp
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30°C
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39°C
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31°C
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33°C
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29°C
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GPU #1
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86°C
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99°C
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93°C
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91°C
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87°C
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GPU #1 Fan
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2060 RPM
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3030 RPM
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2910 RPM
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2325 RPM
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2110 RPM
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GPU #2
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78°C†
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89°C
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85°C
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86°C
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84°C
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GPU #2 Fan
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920 RPM†
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2400 RPM
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2440 RPM
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1960 RPM
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1910 RPM
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CPU fan set to 100% speed, active system fans set
to Low or min. speed.
Ambient temperature: 22°C (results adjusted accordingly).
*P183 & Twelve Hundred tested with Antec CP-850; Nine Hundred Two
and Raven with Cooler Master Silent Pro M700W.
†This video card was not at 100% load in the Raven test.
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Our CrossFireX system configuration illustrates the superiority of the
Twelve Hundred with hotter components over the Nine Hundred Two and P183.
Usually when we add a second HD 4870, the SPL sky rockets to the level of a
blow dryer, but in the 1200, the GPU fans spun at more reasonable levels. Not so in the Twelve Hundred, which kept the GPU fans running 900~1000 RPM slower respectively compared
to the other Antec cases. The CPU temperature was also lower by a very substantial margin, and most of the other component temperatures were at least a bit lower
Interestingly, the Silverstone Raven edged the Twelve Hundred in overall noise, due mostly to better cooling for the second GPU, which ran at half the speed in the Raven. However, this GPU in the Raven test was not at 100%, as the total system power measured at the AC outlet was nearly a 100W lower than the >530W in later 4870s CrossFireX tests. We expect that with full 100% CrossFireX load, the noise level of the Silverstone Raven would likely have been similar to the 31-32 dBA of the Nine Hundred.
It should also be noted that the sound of the fans in the Raven was judged to be very smooth, better than the Antec's fans. While all of the other parameters for these two cases were close enough to call them ties, the CPU ran 10°C cooler in the Twelve Hundred. Still, it can be argued that 56°C in the Raven is a perfectly safe temperature for the CPU.
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