Massive Fan Update
-
- Patron of SPCR
- Posts: 744
- Joined: Tue Mar 04, 2008 4:05 am
- Location: London
- Contact:
-
- Posts: 192
- Joined: Mon May 22, 2006 7:01 am
- Location: USA
-
- Site Admin
- Posts: 12285
- Joined: Sun Aug 11, 2002 3:26 pm
- Location: Vancouver, BC, Canada
- Contact:
I'm responsible for pulling together the new methology article... but I've been swamped with other matters. There's no way to give you a nutshell summary. Please be patient, I hope to have that piece up in a couple days.FartingBob wrote:Whats the cause of the large drop in CFM? Are the fans now tested whilst on a heatsink/case?
Larry is also working on new 120mm fan roundups. That should be done very soon as well.
-
- Posts: 2198
- Joined: Thu Feb 10, 2005 11:20 am
- Location: TN, USA
-
- Patron of SPCR
- Posts: 744
- Joined: Tue Mar 04, 2008 4:05 am
- Location: London
- Contact:
Re: Massive Fan Update
Wow.
Wish this had come about prior to ordering several Noctua fans at the end of last week. I'm astonished at the vast disparity in the CFM figures from the old methodology to the new.
Wish this had come about prior to ordering several Noctua fans at the end of last week. I'm astonished at the vast disparity in the CFM figures from the old methodology to the new.
-
- Moderator
- Posts: 7681
- Joined: Mon Dec 09, 2002 7:11 pm
- Location: Maynard, MA, Eaarth
- Contact:
Re: Massive Fan Update
Hello,
If they work for you, then does the number of CFM's really matter?Fallsroad wrote:I'm astonished at the vast disparity in the CFM figures from the old methodology to the new.
Re: Massive Fan Update
Given I've just installed them today, I cannot answer with any sort of accuracy.NeilBlanchard wrote:
If they work for you, then does the number of CFM's really matter?
The numbers as reported in the reviews do matter for comparative purposes. Notice that the new methodology does not yield a 1:1 difference with any particular fan. The Noctuas apparently fare very poorly in the new testing set up, and that would have impacted my decision to buy them had I been able to have this information prior to buying.
In the end I'm mostly moaning about the near timing of it - I placed my order Friday, they arrived today, I read of the revised data last night. Missed it by a hair.
In the end it doesn't exactly matter what the CFM for a particular fan is - if it fits the application and moves as much air as I need it to and is quiet enough, then it is perfect. But those figures do serve a purpose when it comes to trying to determine which fans may best suit my needs in terms of air flow vs. rpm vs. noise.
I didn't mean to complain, by the way. While brand new to the forums I've been reading SPCR for a very long time and hold a deep appreciation for the work done here.
I am not sure why you are concerned about your purchase.
I don't think the Nocturas fair badly...
Looking at the <19dba lines:
Noctura NF-S12-1200 5V <19 dBA@1m 640 RPM 18 CFM 0.60W
Noctura NF-S12-800 9V <19 dBA@1m 660 RPM 18 CFM 0.48W
Scythe Kama Flow 7V <19 dBA@1m 610 RPM 16 CFM 0.27W
Scythe S-Flex 9V <19 dBA@1m 620 RPM 16 CFM 0.27W
Nexus REAL SILENT 7V <19 dBA@1m 680 RPM 19 CFM 0.62W
It doesn't seem the others move any more air when running silently.
I don't think the Nocturas fair badly...
Looking at the <19dba lines:
Noctura NF-S12-1200 5V <19 dBA@1m 640 RPM 18 CFM 0.60W
Noctura NF-S12-800 9V <19 dBA@1m 660 RPM 18 CFM 0.48W
Scythe Kama Flow 7V <19 dBA@1m 610 RPM 16 CFM 0.27W
Scythe S-Flex 9V <19 dBA@1m 620 RPM 16 CFM 0.27W
Nexus REAL SILENT 7V <19 dBA@1m 680 RPM 19 CFM 0.62W
It doesn't seem the others move any more air when running silently.
Last edited by brucesm on Thu May 08, 2008 8:43 pm, edited 1 time in total.
I was concerned mainly because the sudden change in data on the heels of placing the order for the fans, kind of threw me off.brucesm wrote:I am not sue why you are concerned about your purchase.
Not a huge thing - Noctuas undervolted are doing pretty well, though the NF-P12 makes some unpleasant motor noises using either of the supplied adapters.
That was pretty surprising, as it is neither quiet nor subtle.
In the grand scheme of things, none of this rates.
-
- Posts: 316
- Joined: Thu Aug 10, 2006 11:07 am
-
- Posts: 2198
- Joined: Thu Feb 10, 2005 11:20 am
- Location: TN, USA
I cleaned up your lines to match the format I use, now I'll add a few more:brucesm wrote:I am not sure why you are concerned about your purchase.
I don't think the Nocturas fair badly...
Looking at the <19dba lines:It doesn't seem the others move any more air when running silently.Code: Select all
Noctua NF-S12-1200 5V <19dBA 640RPM 18CFM Noctua NF-S12-800 9V <19dBA 660RPM 18CFM Scythe Kama Flow 7V <19dBA 610RPM 16CFM Scythe S-Flex 9V <19dBA 620RPM 16CFM Nexus 120mm 7V <19dBA 680RPM 19CFM
Code: Select all
Slipstream SH 1900 7V 18dBA 630RPM 21CFM
Slipstream H 1600 5V 21dBA 890RPM 30CFM
Slipstream M 1200 5V 18dBA 720RPM 24CFM
Slipstream M 1200 4V <18dBA 620RPM 20CFM
Slipstream L 800 9V 18dBA 640RPM 21CFM
Slipstream SL 500 12V <18dBA 440RPM 14CFM
Also the SL 500 doesn't do enough CFM to compete either.
But the M 1200 at 5v or 4v beats any fan on the either list for noise to CFM ratios as far as I can see.
Surprisingly the SH 1900 can be undervolted enough to also best most of those fans.
And the L 800 makes it to the list as better than average.
But then all of this data wasn't available to us before this week so there is little reason to beat yourself up over it. Just take note and buy the better fan next time (fans don't last forever).
btw the data is from Fan Roundup #5: Attack of the 120 Scythes
-
- Posts: 2198
- Joined: Thu Feb 10, 2005 11:20 am
- Location: TN, USA
It's so surprising that the 1900 RPM slipstream is more versatile and quiet capable than the 1600 RPM model that I still find it odd when I look at the data. For that purpose I find it nice to have it all on one page so I made this list:
again taken from Fan Roundup #5: Attack of the 120 Scythes
I also highly recommend the content in the discussion of that article at silentpcreview.com/forums/viewtopic.php?t=48060
Code: Select all
Number of samples tested: 2
Slipstream SH 1900 12V 39dBA 1780RPM 79CFM
Slipstream SH 1900 9V 26dBA 1340RPM 54CFM
Slipstream SH 1900 7V 18dBA 630RPM 21CFM
Slipstream SH 1900 5V <18dBA 400RPM 12CFM
Starting voltage 4.7
Number of samples tested: 6
Slipstream H 1600 12V 32dBA 1460RPM 61CFM
Slipstream H 1600 9V 29dBA 1250RPM 47CFM
Slipstream H 1600 7V 24dBA 1080RPM 40CFM
Slipstream H 1600 5V 21dBA 890RPM 30CFM
Starting voltage 4.2
Number of samples tested: 4
Slipstream M 1200 12V 28dBA 1210RPM 46CFM
Slipstream M 1200 9V 24dBA 1030RPM 37CFM
Slipstream M 1200 7V 21dBA 890RPM 30CFM
Slipstream M 1200 5V 18dBA 720RPM 24CFM
Slipstream M 1200 4V <18dBA 620RPM 20CFM
Starting voltage 2.4
Number of samples tested: 2
Slipstream L 800 12V 19dBA 770RPM 24CFM
Slipstream L 800 9V 18dBA 640RPM 21CFM
Slipstream L 800 7V <18dBA 540RPM 18CFM
Slipstream L 800 5V <18dBA 420RPM 13CFM
Starting Voltage 3.2
Number of samples tested: 6
Slipstream SL 500 12V <18dBA 440RPM 14CFM
Slipstream SL 500 9V <18dBA 350RPM 10CFM
Slipstream SL 500 7V <18dBA 270RPM 6CFM
Slipstream SL 500 5V <18dBA 170RPM 2CFM
Starting Voltage 7.3
I also highly recommend the content in the discussion of that article at silentpcreview.com/forums/viewtopic.php?t=48060
Last edited by dhanson865 on Fri May 09, 2008 7:10 pm, edited 2 times in total.
-
- Posts: 2198
- Joined: Thu Feb 10, 2005 11:20 am
- Location: TN, USA
Imagine fuel costs rising every year. If you pay for S&H what is the true cost/value equation of shipping a fan back for warranty replacement?lethul wrote:6 year warranty tho, almost foreverdhanson865 wrote:Just take note and buy the better fan next time (fans don't last forever).
Depending on what part of the world you are in compared to where you have to ship it to it might actually be cheaper to just buy a new fan for some people. Especially if the fan of choice is less than half the cost of the fan you bought the first time...
I suppose I'm about to find out. The Noctua NF-P12 I bought with two NF-S12s is misbehaving, giving off a terrible, loud warbling noise, no matter how fast or slowly it spins.dhanson865 wrote: Imagine fuel costs rising every year. If you pay for S&H what is the true cost/value equation of shipping a fan back for warranty replacement?
Depending on what part of the world you are in compared to where you have to ship it to it might actually be cheaper to just buy a new fan for some people. Especially if the fan of choice is less than half the cost of the fan you bought the first time...
I'd likely be better off getting a Slipstream 1200 rather than pay to ship the Noctua anywhere.