New Scythe 120mm fans - just announced
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
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Neil, from your postings, you're at least as big a fan of the GW NCB fan as I am. I want to tell you that I was considerably startled to discover the Scythe 9-blader pushing the same CFMs as an NCB but with vastly lower non-whoosh noise today...
On the other hand, a few months ago I posted the results of an experiment where I compared a seven-blade high-pitch 220mm fan against a 13-blade low-pitch fan. Hand-held, the high-pitch was an obvious winner. In a real working computer case, the low-pitch was an equally obvious cooling/noise winner.
But the margin of "victory" in my hand-held test today was considerably greater than in that earlier comparison. You just might want to try one of these fans yourself...
On the other hand, a few months ago I posted the results of an experiment where I compared a seven-blade high-pitch 220mm fan against a 13-blade low-pitch fan. Hand-held, the high-pitch was an obvious winner. In a real working computer case, the low-pitch was an equally obvious cooling/noise winner.
But the margin of "victory" in my hand-held test today was considerably greater than in that earlier comparison. You just might want to try one of these fans yourself...
I picked up the 200RPM model in Akihabara last week. It's plugged into my CPU fan header and is temp controlled by the BIOS. At 1000-1200RPM it's below my ambient, but when it spins up...you HEAR it! I'm going to replace it with one of the new "Slip Stream" models being discussed here.gmat wrote:Anyone got a hold of the 38mm fans ? They'll take their sweet time to come to Europe as it seems...
Well i was aiming specifically at the 1000rpm model, the stated dBA rating is very low, and the stated flow and static pressure are rather high... looks like a winner for using over a radiator or such heavy restrictions ?miahallen wrote: I picked up the 200RPM model in Akihabara last week. It's plugged into my CPU fan header and is temp controlled by the BIOS. At 1000-1200RPM it's below my ambient, but when it spins up...you HEAR it! I'm going to replace it with one of the new "Slip Stream" models being discussed here.
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Would probably be very good also Thermalright SI-128 / SI-128 SE. I am going to test 1000 RPM model on my SI-128 SE when I have changes.gmat wrote:Well i was aiming specifically at the 1000rpm model, the stated dBA rating is very low, and the stated flow and static pressure are rather high... looks like a winner for using over a radiator or such heavy restrictions ?miahallen wrote: I picked up the 200RPM model in Akihabara last week. It's plugged into my CPU fan header and is temp controlled by the BIOS. At 1000-1200RPM it's below my ambient, but when it spins up...you HEAR it! I'm going to replace it with one of the new "Slip Stream" models being discussed here.
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Start and RPM data on the 9-blade 800RPM nominal model:
start voltage: rarely 3V, usually 3.5V always 4V(?) [pwr switch-on start]
12V 842RPM, 9V 707, 6V 516, 4V 357, 3V 271 @ 4100ft altitude
(RPM measured with an Extech stroboscope)
The rated CFM of this 800RPM model is ~40CFM, which is probably right for free airflow (low back-pressure). Those of thinking about substituting for their 1000RPM Nexus, for example, should look to this model.
Note that the starting voltage for the Scythe S-Flex "D" 800RPM model is considerably higher. This fan has a nice start-booster built into its motor controller. Wish I knew the details.
edit: strobe use noted
start voltage: rarely 3V, usually 3.5V always 4V(?) [pwr switch-on start]
12V 842RPM, 9V 707, 6V 516, 4V 357, 3V 271 @ 4100ft altitude
(RPM measured with an Extech stroboscope)
The rated CFM of this 800RPM model is ~40CFM, which is probably right for free airflow (low back-pressure). Those of thinking about substituting for their 1000RPM Nexus, for example, should look to this model.
Note that the starting voltage for the Scythe S-Flex "D" 800RPM model is considerably higher. This fan has a nice start-booster built into its motor controller. Wish I knew the details.
edit: strobe use noted
So if it were you, would you get the slipstream fans over the sflex fans? I'm torn here, should I get the slipstream and ditch my sflex for these? The 800 rpm sflex is like 20 dba at 32 cfm where as the slipstream is 10 dba at 42 cfm those specs are much better than the sflex, but we all know how specs can be misleading....
I'm interested to get verification on this as well.falcon26 wrote:So if it were you, would you get the slipstream fans over the sflex fans? I'm torn here, should I get the slipstream and ditch my sflex for these? The 800 rpm sflex is like 20 dba at 32 cfm where as the slipstream is 10 dba at 42 cfm those specs are much better than the sflex, but we all know how specs can be misleading....
Thanks!
I've read some reviews that say the S-FLEX pushes less air and is less quiet than these new KAZE-JYUNI fans. This is probably due to the ball bearings in the S-FLEX that give them their long life, but the JYUNI series are supposed to last 3 years on 24/7 operation, which is rather long for <$10 fans.
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The only similarity is, both are 120mm x 25mm fans. The SFlex is competition for the Yate Loons and GW NCBs. The SlipStream fans are competition for the Noctua fans.falcon26 wrote:So if it were you, would you get the slipstream fans over the sflex fans?
The SlipStreams should perform spectacularly well in conventional fan tests, where there's no backpressure. I predict that the SlipStreams will do poorly in computer cases with high backpressure, just as the Noctuas do. Alas, all too many computer cases (including mine) have relatively high backpressure - a common cause is unbalanced input/output vent area. There is no industry-standard fan test for fans in computer cases.
I'm seriously considering modifying a case to provide the intake area needed to reduce backpressure significantly, to try the new fans. Alas, I have two projects in front of that.
Meanwhile, it will help if some SPCR types stop yammering for more and greater fan tests and give them a try and report the results. It's not as if these fans are expensive or hard to use!
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By extension, doesn't this doom positive pressure setups to being less efficient?Bluefront wrote: Which is worse to the airflow from a computer fan......IMHO back-pressure. Try it yourself.....put a foam air filter in front of a fan, then behind the fan. Trying to blow through the filter (back pressure) reduces the airflow much more than sucking through the filter. That's why stand-alone air filter units almost always suck through the filter.
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Sorry, I should have been clear. In positive pressure setups, ignoring the filtering, cooling is done through backpressure. You have intakes that push air into the case which is then let out at certain places, creating airflow. In a negative pressure case, the air is dragged through the case, which fans are supposed to be better at doing. Or am I missing something?Bluefront wrote:Jeff Cutsinger.....not sure what you mean. In most positive pressure setups, the fan sucks through the filter, rather than trying to blow through it. And certainly the presence of a filter adds some airflow restriction, no matter what.
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To cool a computer case, one or more fans is mounted in a hole in a case wall. The fan blows air from one side of the wall to the other. If the fan is blowing air into the case, it's a positive pressure case. If the fan blows air out, negative. Theoretically, you can use fans both ways and have balanced pressure but most folks don't do that.
A fan doesn't care if it's an intake or exhaust. It just blows air.
My mid-tower-cased PCs use a 220mm intake fan on the left side panel and so are positive pressure cases. My uATX PCs use two 120mm exhaust fans, one modded into the PSU but controlled external to the PSU, and so are negative pressure cases.
I love the extra space inside the mid-towers but hate the large size on my desk. I love the small size of the uATX on my desk but hate the crowded interior of the case.
A fan doesn't care if it's an intake or exhaust. It just blows air.
My mid-tower-cased PCs use a 220mm intake fan on the left side panel and so are positive pressure cases. My uATX PCs use two 120mm exhaust fans, one modded into the PSU but controlled external to the PSU, and so are negative pressure cases.
I love the extra space inside the mid-towers but hate the large size on my desk. I love the small size of the uATX on my desk but hate the crowded interior of the case.
Just replaced all the fans in my P180 with Scythe fans. My topside TriCool failed, so I figured it was time for a change.
Old config:
120x38mm Antec TriCool - PSU chamber
120x25mm Antec TriCool - Front HDD, Rear, Top
(All of them were running at "low" setting)
New config:
120x38mm Scythe UltraKaze (1000rpm) - PSU chamber, Rear, Top
120x25mm Scythe S-Flex (800rpm) - Front HDD
(All of these are running at full speed, directly connected to power)
Putting the 38mm fans in the top and rear vents was a bit of a tight squeeze, but it fit with enough space to be comfortable.
The noise characteristic changed significantly. There's more of a whoosh now that the Scythe fans are pushing more air, but there's none of the whine that comes with smaller/high-rpm fans. Even better though, my internal case temps are significantly lower (by at least 3-5C).
Overall, I'd rate this upgrade 8 out of 10. Somewhat more overall noise, but the boost in CFM (and resulting lower internal temps) is very welcome.
Old config:
120x38mm Antec TriCool - PSU chamber
120x25mm Antec TriCool - Front HDD, Rear, Top
(All of them were running at "low" setting)
New config:
120x38mm Scythe UltraKaze (1000rpm) - PSU chamber, Rear, Top
120x25mm Scythe S-Flex (800rpm) - Front HDD
(All of these are running at full speed, directly connected to power)
Putting the 38mm fans in the top and rear vents was a bit of a tight squeeze, but it fit with enough space to be comfortable.
The noise characteristic changed significantly. There's more of a whoosh now that the Scythe fans are pushing more air, but there's none of the whine that comes with smaller/high-rpm fans. Even better though, my internal case temps are significantly lower (by at least 3-5C).
Overall, I'd rate this upgrade 8 out of 10. Somewhat more overall noise, but the boost in CFM (and resulting lower internal temps) is very welcome.