Reality Check: People can’t notice sound differences larger than 3dB. (Read: You will not be able to tell the difference between a 36dB case and a 39dB case). Under 35dB is considered silent.

ManufacturerModel dB @ IdledB @ FullNeweggAmazonEbayGood PriceComment
In Win3033438.4@Newegg@Amazon@eBay$90
AnideesAI-Crystal Window Black3144.7@Amazon@eBay$150
BitfenixAurora Window38.2@Amazon@eBay$123
CorsairCarbide 100R@Newegg@Amazon@eBay$68
CorsairCarbide 330R3141.5@Newegg@Amazon@eBay
CorsairCarbide 400R28.843.8@Amazon@eBayOOS
CorsairCarbide 500R 31.349.2@eBayOOS
CorsairCarbide 600Q28.542.8@eBayOOS
CorsairCarbide Air 540 Black27.947.1@Newegg@Amazon@eBay
Cooler MasterCM 690 III Black30.641.8@Amazon@eBayOOS
CorsairCrystal Series 570X35.245.5@Newegg@Amazon@eBay
GelidDarkforce3140@eBayOOS
NanoxiaDeep Silence 23130.4@eBayOOSRecommended
NanoxiaDeep Silence 32837@Amazon@eBayOOSRecommended
NanoxiaDeep Silence 42837@Amazon@eBayOOSRecommended
NanoxiaDeep Silence 52837@eBayOOSRecommended
Nanoxia Deep Silence 630.240.5@Amazon@eBay$280
Fractal DesignDefine R43139.5@eBayOOS
Fractal DesignDefine R530.435.9@Newegg@eBay$137Recommended
Fractal DesignDefine R631.338.7@Newegg@Amazon@eBay$120Recommended
AntecEleven Hundred37.144.9@eBayOOS
X2Empire Window Silver33.639.7@eBayOOS
PhanteksEnthoo Pro Window47.6@Newegg@Amazon@eBay100
EnermaxFulmo Basic33.148.9@eBayOOS
NZXTH440 New Edition Window29.139.5@Newegg@Amazon@eBay
Cooler MasterHAF 912 Plus30.542.6@Newegg@Amazon@eBay$70
Cooler MasterMasterCase 53042.6@Amazon@eBay
Cooler MasterMasterCase Pro 543.4@eBay
AntecNine Hundred Two V349.2@eBay
NZXTNoctis 4503140.5@Newegg@Amazon@eBay$160
CorsairObsidian 450D31.842.7@Newegg@Amazon@eBay$120
Antec P101@Newegg@Amazon@eBay
AntecP110 Window Luce34.139.7@Newegg@Amazon@eBay
AerocoolP7-C1BG30.640.4@Newegg@Amazon@eBay$120
BitfenixPandora ATX Window Black26.937.9@Newegg@Amazon@eBay$90
AntecPerformance One P10027.539.3@Newegg@Amazon@eBay$82Recommended
AntecPerformance One P28027.643.7@eBayOOS
AntecPerformance One P38029.244.3@eBayOOS
AntecPerformance P9 Window26.842.3@Newegg@Amazon@eBay$85
NZXTPhantom 410 White3156.5@Newegg@Amazon@eBay$108
Be quiet!Pure Base 600 Window40.947.6@Newegg@Amazon@eBay$100
SilverStoneRaven RV03B-W26.853.8@Newegg@Amazon@eBay$200
SilverStoneRaven RV05B-W51.6@Newegg@Amazon@eBay$130
Cooler MasterSilencio 35233.848.5@Amazon@eBay$90Recommended
Cooler MasterSilencio 652s32.237.9@Newegg@Amazon@eBay$120Recommended
Be quiet!Silent Base 600 Window30.141.2@Amazon@eBay
Thermaltake Suppressor F31@Newegg@Amazon@eBay$90
SilverStoneTemjin TJ04-E Black39.945.2@eBayOOS
CorsairVengeance C70 G32.444.7@eBayOOS
AerocoolXPredator X3 Evil32.141.1@Amazon@eBay$150

See some crazy high prices?