Need to replace top fans in a Lian Li PC-B25F. Some RPM quesitons Tags: Power Supplies Cases Lian Li LED Monitor Components Product Last response: October 4, 2010 1:28 AM in Components Share mark_k December 22, 2009 3:29:22 PM Currently the case (Lian Li PC-b25F) has 2 x (140mm x 25mm) top fans with 1000RPM 3-Pin Connector with RPM sensing. I can only choose between 900RPM or 1200RPM for the replacement fans (1000 not offered), which RPM should I go with? These are also 3-Pin Connector with RPM sensing. CASE Specificaitons: http://www.lian-li.com/v2/en/product/product06.php?pr_i... The replacement fans (with Blue LEDs) that I'm looking at are: Lian Li 140x25mm, Blue LED (CF-1409A) - 900 RPM http://www.performance-pcs.com/catalog/index.php?main_p... or Lian Li 140x25mm, Blue LED (CF-1412A) - 1200 RPM http://www.performance-pcs.com/catalog/index.php?main_p... The Acoustical Noise for both fans are the same at 26.95dBA (Max 27.6dBA) Thanks Mark More about : replace top fans lian b25f rpm quesitons masterasia December 22, 2009 4:19:49 PM I'm using the red CF-1412A in K-62. It's pretty quiet. The stock ones were the blue CF-1409A mark_k December 22, 2009 5:04:29 PM Thanks masterasia, The stock ones are 1000 RPM not LED though. I was just wondering if I should get the blue LED with 900 or 1200 RPM? Related resources LIAN LI PC-B25F ALL ALUMINUM MID-TOWER COMPUTER CASE - Forum Lian Li PC-P50 case questions - Forum Between the two Lian Li 's.... - Forum Lian Li 140x25mm, Blue LED (CF-1412A) - 1200 RPM - Forum Fan controller for Lian-Li case with 8 noisemakers - Forum Can't find your answer ? Ask ! Get the answer mark_k December 25, 2009 11:27:02 AM So should I go with the 900 rpm fans rather then the 1200 rpms as 900 is closer to the 1000 rpm that it comes with? I want good cooling but also want to keep the noise down. Merry CHRISTmas JohnnyLucky a c 248 ) Power supply December 25, 2009 12:22:44 PM Mark - Have you taken any sort of thermal measurements with the stock cooling fans? Why do you want to replace the stock fans? Want a little color? If you don't mind a little extra noise go with 1200 rpm fans. That's pretty much the sweet spot. David_78 February 26, 2010 3:41:14 PM Hi Mark_K, I read your post about Li PC-b25F inner fans, I'm going to buy this case or Coolermaster cm840 with 23" fans. deciding for who of those cases have the in stock silent fans.. from your side the b25f fans are silent? less than 20 db? thanks a lot for your reply David mark_k October 3, 2010 3:44:49 PM David the fans are loud. I am kow looking at Noctua NF-P14 FLX 140mm Case Fan http://www.newegg.com/Product/Product.aspx?Item=35-608-... I want at least 1000 RPM but also quite. Need 140 mm fan. Anyone have any suggestions? Mark davcon a c 270 ) Power supply October 4, 2010 1:06:24 AM If you want quiet 140mm fans Thermalright and Scythe fans are better then Noctua's and cost about half the price. Thermalright TR TY-140 140mm x 160mm PWM Fan - 900R~1300PM (Standard 120mm Fan Mount)-$14.99 http://www.frozencpu.com/products/11677/fan-755/Thermal... Scythe Kaze Maru 2 Slip Stream 140mm x 25mm Fan (120mm Mount) - 1200 RPM (SM1425SL12M)-$13.99 http://www.frozencpu.com/products/10218/fan-662/Scythe_... There's a reason the TR is out of stock it's the best 140mm fan made period 20db. mark_k October 4, 2010 1:28:29 AM The scythe 140mm only fit in 120mm holes. I need the 140mm hole fan frame. I just ordered 2 Noctua NF-P14 Flx fans for a total of $49.00 delivered. These have 140mm hole adaptors. I hope I did the right thing by ordering these? Thanks Mark Can't find your answer ? Ask ! Publish Related resources: ForumLIAN LI (PC-C60B) for Gaming OCing ForumReplacement 120mm Fans for Lian-Li PC-7B Plus ForumLian Li PC-75 case mods. Should I nor not.? ForumLian Li PC-60 and Drive Heat ForumLian Li PC-A70 Case Review. (pics included) ForumLian Li K62 Fans ForumLian-Li 140mm fans , who sells them? ForumMultiple Fan Quesitons ForumLian Li Case: Replacing fan - little plastic connectors ForumAntec 900 & Cooler Master V8 Install w/ Pictures ForumCPU Cooler for an OC 2500k in a Lian Li pc-c60b ForumLian Li PC-Z70 Enough Cooling? ForumNeed some help replacing PSU ForumI think I need a SATA cable for my hard drives ForumLian li v2000 More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !