No don't unplug the card. If a low power card has a fan, then it probably has a TINY heatsink, so if you unplug the fan you'll probably damage your card.
Go on newegg and pick up a cheap fanless heatsink. That'll be the best thing to do.
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Silent Mini-Rig
Intel Core 2 Quad Q6600
4GB G.Skill DDR2 800 Memory | 400GB WD SATA HD
eVGA 8800GT 512mb Graphics Card
X-Fi Xtrememusic Sound Card
Hauppauge HVR 1800 MCE TV Tuner
Scythe Ninja | AC Accelero S1 Passive heatsink
CM Elite 340 mATX Case | Noctua NF-S12 Fans
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