Search found 59 matches

by photonblaster
Sat Feb 19, 2011 8:30 pm
Forum: Fans and Control
Topic: 5dBA 120mm Fan.
Replies: 55
Views: 12473

Re: 5dBA 120mm Fan.

1. "This is why two fans that measure 11dBA in their room do not add up to 14dBA when you combine them. The fans themselves are actually much lower than the 11dBA." This part I get. 2. Dbs are logarithmic. So 15db plus 15 db doesn't equal 30 db. Are you taking that into account? (my recollection is...
by photonblaster
Sat Feb 19, 2011 8:23 pm
Forum: Fans and Control
Topic: 5dBA 120mm Fan.
Replies: 55
Views: 12473

Re: 5dBA 120mm Fan.

It is clear that the sound level has a linear relationship with fan voltage above the measurement floor (greater than 6V, 700 RPM). This is not true. It is so not true at so many levels, it diminishes the credibility of everything else you say. photonblaster There is no relationship between fan vol...
by photonblaster
Sat Feb 19, 2011 7:48 pm
Forum: Fans and Control
Topic: 5dBA 120mm Fan.
Replies: 55
Views: 12473

Re: 5dBA 120mm Fan.

It is clear that the sound level has a linear relationship with fan voltage above the measurement floor (greater than 6V, 700 RPM). Sound engineers can probably explain the physics here, but not me! I only need the practical result that we can fit the data to a simple model: the measured noise (Nm)...
by photonblaster
Sat Feb 19, 2011 9:55 am
Forum: Fans and Control
Topic: 5dBA 120mm Fan.
Replies: 55
Views: 12473

Re: 5dBA 120mm Fan.

I will admit that I don't understand any of this.... But it still doesn't make sense to me. Let me summarize then: 1) SPCR does not measure the sound of a fan when it is operating at low RPM, they measure the sound of the room on top of limitations of their sound measuring system plus the noise fro...
by photonblaster
Sat Feb 19, 2011 7:36 am
Forum: Fans and Control
Topic: 5dBA 120mm Fan.
Replies: 55
Views: 12473

5dBA 120mm Fan.

5dBA 120mm Fan. Sounds incredible but may actually be true. Reader beware: This post may be received like the never ending conflict between baseball fans who seem to hate or love statistics! I am a little tone deaf, and cannot really distinguish the subtleties of fan noises when they are loud enough...
by photonblaster
Sun Jan 30, 2011 9:01 am
Forum: Quiet Prebuilt, SFF and Barebones Systems
Topic: Serenity i7 Sandy Bridge PC, SPCR Edition, by Puget Computer
Replies: 34
Views: 16342

Re: Serenity i7 Sandy Bridge PC, SPCR Edition, by Puget Comp

One design approach for our own systems is (obviously) to extrapolate from builds like this Serenity and the other great articles from late 2010. My next build needs maximum of raw computing power, ultra-quiet, with need for only simple 2D video. Looking at the Serentity temperature data, and review...
by photonblaster
Sat Jan 29, 2011 5:23 pm
Forum: Power Supplies
Topic: Seasonic X-760 or CP-850?
Replies: 6
Views: 1719

Re: Seasonic X-760 or CP-850?

My strong suspicion (without seeing the complete build) is that you don't need anything more than a Seasonic X-560. M., I support your comment but one can extrapolate from this. (Sorry, J., I cannot comment on the two specific ones you are asking about. Maybe another member can. Just some general a...
by photonblaster
Thu Jan 27, 2011 12:56 pm
Forum: Silent Storage
Topic: multiple hard drives, not for server but for RAID speed
Replies: 28
Views: 5917

Re: multiple hard drives, not for server but for RAID speed

Your choice (RAID0 with 2 drives) makes a lot more sense than RAID5 if you ask me. Curious as to why you would say that? 3 drives in RAID5 give almost the same performance level as 2 in RAID0, but with drive failure reduncancy. With the new high performance 2.5" dirves, $50-$70 each, you can get sa...
by photonblaster
Wed Jan 26, 2011 5:24 pm
Forum: Silent Storage
Topic: multiple hard drives, not for server but for RAID speed
Replies: 28
Views: 5917

Re: multiple hard drives, not for server but for RAID speed

It's not that simple. We all wish it were but it isn't. There are different performance characteristics you can look at. In some respects, even a single hard drive is still better than most SSDs in practice. But in other respects no amount of money thrown at RAID arrays will come close to the perfo...
by photonblaster
Wed Jan 26, 2011 1:41 pm
Forum: Silent Storage
Topic: HDD Elastic Suspension... Show your pics!
Replies: 446
Views: 947701

Re: HDD Elastic Suspension... Show your pics!

Just for the record, do I insert a picture where the headline says "Upload attachment"? I read some time ago that adding a picture in the forums was difficult but maybe that is not the case anymore. Try things in the "Test Forum". To post a picture you need to put it on the WWW somewhere and insert...
by photonblaster
Wed Jan 26, 2011 1:34 pm
Forum: Silent Storage
Topic: multiple hard drives, not for server but for RAID speed
Replies: 28
Views: 5917

multiple hard drives, not for server but for RAID speed

The recent server silent build articles show that you can have multiple hard drives and still keep a system relatively quiet. I want to go to multiple hard drives not to get more storage capacity but for Raid 5 to get more I/O speed. Use enough drives and you can get SSD speed with a lot more storag...
by photonblaster
Thu Jan 20, 2011 9:23 am
Forum: CPU Cooling
Topic: What's the best current CPU heatsink if money is no problem?
Replies: 16
Views: 4763

Re: What's the best current CPU heatsink if money is no prob

The newest release of Archon with Thermalright TY-140 fan looks to be VERY good, but VERY tall.
Linke to one review:
http://www.xbitlabs.com/articles/cooler ... hon_4.html
by photonblaster
Mon Jan 17, 2011 4:43 pm
Forum: SPCR Article Discussion
Topic: Noctua NH-C14 Dual Fan Top-down CPU Cooler
Replies: 13
Views: 8787

Re: Noctua NH-C14 Dual Fan Top-down CPU Cooler

Re-read the review again. It would have also been very interesting to test the HS with the Scythe 140mm fans. In the Prolimatech Armageddon & Coolermaster V8 CPU Coolers review ( http://www.silentpcreview.com/article1039-page9.html ) it was found: "The Scythe 140 mm fan fared much better than the No...
by photonblaster
Sun Jan 16, 2011 6:50 pm
Forum: SPCR Article Discussion
Topic: Noctua NH-C14 Dual Fan Top-down CPU Cooler
Replies: 13
Views: 8787

Re: Noctua NH-C14 Dual Fan Top-down CPU Cooler

"The only surprise was how well our 120 mm reference fan performed." I am actually not that surprised. I do not recall ever seeing an SPCR HS review where the reference fans did not do better than the stock fans. Only exception may be the Prolimatech Armageddon review where the review commented tha...
by photonblaster
Sun Jan 16, 2011 6:42 pm
Forum: Fans and Control
Topic: Xbitlab measurements say 120mm fans give more cfm 4 same dBA
Replies: 4
Views: 1072

Re: Xbitlab measurements say 120mm fans give more cfm 4 same

Thanks, everyone. I should have twigged on the methodology change at Xbitlab, I have read both links at one time or another. To summarize what I found in the links if anyone is interested: Xbitlab's 140mm fan review used a turbulance reducing method (an array of straws) very similar to one that SPCR...
by photonblaster
Sat Jan 15, 2011 5:51 pm
Forum: Fans and Control
Topic: Xbitlab measurements say 120mm fans give more cfm 4 same dBA
Replies: 4
Views: 1072

Xbitlab measurements say 120mm fans give more cfm 4 same dBA

Xbitlab did a huge amount of work in fan round ups, but with 31dBA noise floor measuements. If you compare the 140mm and 120mm results on the two reviews (last fall and summer of 2009, respectively) http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup_12.html#sect0 http://www.xbitlabs....
by photonblaster
Sat Jan 15, 2011 4:22 pm
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

The discontinued Setugen used a 0.35A version... different from any on the page you linked. Note that it was rated for 2000rpm max, so the closes equivalent is the 2,000rpm SY1212SL12H. Thanks for the reply Mike, but I may have been too cryptic in my post. The SFF Gamer/ Server used a Slip Stream S...
by photonblaster
Sat Jan 15, 2011 11:41 am
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

Which Slip Stream Slim fan is it used as a GPU HS cooler? It probably was not this one! :) http://www.silentpcreview.com/article1028-page5.html Available versions are listed here: (800-2000 rpm) http://www.scythe-usa.com/product/acc/068/sy1212sl12_detail.html Which one was used? I seached for half a...
by photonblaster
Sat Jan 15, 2011 10:52 am
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

Great series of articles, so much work and so much info. Tough to do everything everyone would like. Anyway, the HTPC assembly has ~8degC lower HDD temps with the front door open. Interesting, but certainly not asthetical pleasing. http://www.silentpcreview.com/Testing_the_HTPC_Home_Server Any chanc...
by photonblaster
Thu Jan 13, 2011 6:39 pm
Forum: SPCR Article Discussion
Topic: Noctua NH-C14 Dual Fan Top-down CPU Cooler
Replies: 13
Views: 8787

Re: Noctua NH-C14 Dual Fan Top-down CPU Cooler

"The only surprise was how well our 120 mm reference fan performed." I am actually not that surprised. I do not recall ever seeing an SPCR HS review where the reference fans did not do better than the stock fans. Only exception may be the Prolimatech Armageddon review where the review commented that...
by photonblaster
Thu Jan 13, 2011 5:56 pm
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

Two builds looked at noise effects when 3 HDD were "removed".

Were they physically removed or just unplugged?

The reason I ask is that perhaps the lack of the HDD in the system increased the internal resonances so the sound level did not drop as much as one would expect.
by photonblaster
Thu Jan 13, 2011 5:50 pm
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

Thanks for the nice series on quiet builds with more aggresive performance configurations (HDD and graphics). I want to use the info to design my own system with different components to suit my particular needs, but estimating noise levels is giving me problems since some of the data seems to be fa...
by photonblaster
Fri Jan 07, 2011 8:46 pm
Forum: SPCR Article Discussion
Topic: Silent Home Server Build Guide
Replies: 137
Views: 50565

Re: Silent Home Server Build Guide

Thanks for the nice series on quiet builds with more aggresive performance configurations (HDD and graphics). I want to use the info to design my own system with different components to suit my particular needs, but estimating noise levels is giving me problems since some of the data seems to be far...
by photonblaster
Thu May 06, 2010 5:22 pm
Forum: SPCR Article Discussion
Topic: Silverstone Raven Two
Replies: 31
Views: 17976

180mm fan speeds

Wouldnt there be less noise if, rather than having one or two fans set on low and the other(s) set on high to have them all set at same speed using a different fan controller that gives the same cooling? Also the article mentions that a HD can be mounted in the optical drive section...so why not do ...
by photonblaster
Thu May 06, 2010 5:07 pm
Forum: SPCR Article Discussion
Topic: Silverstone Raven Two
Replies: 31
Views: 17976

vent locations

If you look at some of the pictures, you can see quite a bit of venting at the top above the drive cage. This venting would not seem to be necessary...CD burners do not get very hot, and hard drives mounted lower in the cage would get some air flow directly from the front 180mm fan. So why not block...
by photonblaster
Thu May 06, 2010 4:53 pm
Forum: SPCR Article Discussion
Topic: Recommended Fans page
Replies: 146
Views: 143812

Background noise correction/missing fan recommendation?

It seems many of these tests were done with background noise level of about 18dBA, newest chamber has about 11dBA. Are the reported noise levels corrected for background level? If not, when SPRC reports ~18dBA, the fan probably has more than 5dBA less than this, right? since you need to add a noise ...
by photonblaster
Thu May 06, 2010 4:26 pm
Forum: SPCR Article Discussion
Topic: Silverstone Raven Two
Replies: 31
Views: 17976

Power supply noise contribution and Video card

1. The Seasonic X-650 review at SPCR says it has 31dBA@500W, but the review says the case has less than this with two video cards fully loaded so PS is at 500W. Is this because of PS being inside the case? 2. The Zalman ZM-1000 review says it only has 26dBA@500W. How much quieter would the Silversto...
by photonblaster
Sun May 17, 2009 2:52 pm
Forum: Fans and Control
Topic: Low noise mounting of fan to HS
Replies: 2
Views: 983

Ewww FrostyTech..........but they don't standardize anything, making their "rankings" a complete joke. The heatsink you mentioned doesn't look special at all. In fact it looks like another dime-a-dozen Xigmatek clones.......... Take any of the heatsinks from their top performance list, slap a low r...
by photonblaster
Sun May 17, 2009 10:06 am
Forum: Fans and Control
Topic: Low noise mounting of fan to HS
Replies: 2
Views: 983

Low noise mounting of fan to HS

Akasa's NERO AK967 made it to Frosty Techs top ten list...in fact both cooling ability and low noise for socket 775, the only one to do so. frostytech. /top5heatsinks .cfm frostytech. /articleview.cfm?articleid=2354&page=2 (sorry, newbie to the forum cannot do proper links) Their fan mounting techni...