question bout black ice 2 ?

jetjaguar · 12-04-2001, 10:44 PM

Does it really require 100 + cfm fans
could i put JMC 68.9 cfm fans on it ??
i mean they say on the site .. MUST be 100cfm at least ... is this really true .. anyoen have one running with less then that ?
also how does it perform compared to like the dtek core ?
im only cooling much chip .. nuttin else

might pick one of these up for my cube =)

[dannzig] · 12-10-2001, 09:29 AM

i think the only problem will be inferior performance. of course you CAN run with lower cfm fans, you just dont get out the performance that is actually there....
jsut stating the obvious i guess

Butcher · 12-10-2001, 10:06 AM

The drop is performance is disproportionate with fan power i.e. using a 69cfm fan instead of 100 probably gives less than half the airflow. This is because smaller fans deal less well with static backpressure and BI2s have quite a bit of it (as do most rads). It's probably better to get a bigger fan and run it slow as thicker fans deal with backpressure better and the motor will probably have more torque (esp. if you use PWM to slow it instead of volt mod or rheostat).

Kevin · 12-10-2001, 12:20 PM

Good call, butcher.
-kev

Triton · 12-10-2001, 07:23 PM

A question about that 100cfm of back pressure rating?

Is that with the fans blowing on the radiator or sucking?

I would think that you could use a push pull setup with fans in front and back at a lower cfm and decrease the back pressure problem. Am I wrong?

Butcher · 12-11-2001, 05:01 AM

Quote:

Originally posted by Triton:
A question about that 100cfm of back pressure rating?

Is that with the fans blowing on the radiator or sucking?

Either way though the exact backpressure will vary somewhat between them. To much backpressure for the fan will cause it to stall and make a lot of turbulence noise.

Quote:

I would think that you could use a push pull setup with fans in front and back at a lower cfm and decrease the back pressure problem. Am I wrong?

Push pull increases backpressure handling but small fans don't work so well with push-pull due to the low torque of their motors. BillA did some testing on this and found that with low flow fans they'd setup waves and stalll each other resulting in very erratic flow patterns.

Triton · 12-11-2001, 11:35 AM

I'm not sure if I was clear. I read that link. The link referred to stacking fans

radiator <- fan <- fan

I was referring to a push pull setup with fans

<-fan radiator <-fan

Brad · 12-11-2001, 09:18 PM

yeah, thats what would be meant, fan|||fan

you might be best to mount the fans off centre so you don't have the dead spot and to spread the air out

AL666 · 12-15-2001, 02:45 AM

I have Black Ice 2 w/ 2 Delta 130CFM fans on it... Chip threw couple of those Deltas with my order as a complimentary gift...
So why are you so worried about the fans man?
Noise? It's not an issue anymore... Have you heard about a device called DigitalDoc5? ( If you heard about it, listen to this... By adding a relay switch to one of its headers it can automatically controls the RPM of your fan...
(I'm afraid I'm going sound like I'm pimpin this freakin thing, but it seems like nobody's aware of its existence) Even the ioport.com guys are using this mod + auto shutdown mod for their pelt systems... come'on wake up... They came up with it couple of days ago after me and some other guys criticized them for not having even a warning device in their expensive rigs...
BTW currently I'm working on the auto shutdown mode (trying to figure out how they did that basically:0) any help is greatly appreacited... I think it's a must have mod for all aquacooled system users, especially for the ones with peltiers...

12-04-2001, 10:44 PM	#1
jetjaguar Cooling Neophyte Join Date: Nov 2001 Location: new jersey Posts: 82	question bout black ice 2 ? Does it really require 100 + cfm fans could i put JMC 68.9 cfm fans on it ?? i mean they say on the site .. MUST be 100cfm at least ... is this really true .. anyoen have one running with less then that ? also how does it perform compared to like the dtek core ? im only cooling much chip .. nuttin else might pick one of these up for my cube =) __________________ Pentium 2.4C@3.423 1.65vcore - Zalman 7000cu Abit IC7-G 1gb Corsair pc3500ddr 2-6-3-2 37gb WD 10K Raptor SATA 120gb WD 8mb Cache 120gb Maxtor 8mb Cache ATI 9700pro @ 351/660 - Zalman Heatpipe Turtle Beach Santa Cruz Klipsch 4.1 Pro Media Modded Lian Li PC71 Modded Antec True Control 550 LiteOn 48x24x48x16 cdrw/dvd Sony 21inch G520P

12-10-2001, 09:29 AM	#2
[dannzig] Cooling Savant Join Date: Dec 2001 Location: Sweden Posts: 98	i think the only problem will be inferior performance. of course you CAN run with lower cfm fans, you just dont get out the performance that is actually there.... jsut stating the obvious i guess __________________ \|father of ebba - www.ebba.da.ru\| at7max/d700/256/80/ti4200

12-10-2001, 10:06 AM	#3
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	The drop is performance is disproportionate with fan power i.e. using a 69cfm fan instead of 100 probably gives less than half the airflow. This is because smaller fans deal less well with static backpressure and BI2s have quite a bit of it (as do most rads). It's probably better to get a bigger fan and run it slow as thicker fans deal with backpressure better and the motor will probably have more torque (esp. if you use PWM to slow it instead of volt mod or rheostat). __________________ Once upon a time, in a land far far away...

12-10-2001, 12:20 PM	#4
Kevin Slacking more than your weird uncle Join Date: Nov 2000 Location: San Diego, CA (UCSD) / Los Angeles, CA (home) Posts: 1,605	Good call, butcher. -kev __________________ I used to throw hot coffee all over the ass of the horse there, then whip him while he was kickin' at me. Those f***in things are crazy.

12-10-2001, 07:23 PM	#5
Triton Cooling Neophyte Join Date: Nov 2001 Location: Union City, CA Posts: 78	A question about that 100cfm of back pressure rating? Is that with the fans blowing on the radiator or sucking? I would think that you could use a push pull setup with fans in front and back at a lower cfm and decrease the back pressure problem. Am I wrong? __________________ XP1800+ Gigabyte GA-7DX 512mb Crucial 2100 watercooled with Danger Den, Eheim, 1/2" silicone tubing, and Black Ice Xtreme radiator. Liteon 24x10x40x CDRW WD80gb +30gb hard drives Liteon FS020 case and much more at http://www.jakeandkelly.com/customcomputer/index.htm

12-11-2001, 11:35 AM	#7
Triton Cooling Neophyte Join Date: Nov 2001 Location: Union City, CA Posts: 78	I'm not sure if I was clear. I read that link. The link referred to stacking fans radiator <- fan <- fan I was referring to a push pull setup with fans <-fan radiator <-fan __________________ XP1800+ Gigabyte GA-7DX 512mb Crucial 2100 watercooled with Danger Den, Eheim, 1/2" silicone tubing, and Black Ice Xtreme radiator. Liteon 24x10x40x CDRW WD80gb +30gb hard drives Liteon FS020 case and much more at http://www.jakeandkelly.com/customcomputer/index.htm

12-11-2001, 09:18 PM	#8
Brad Thermophile Join Date: Oct 2001 Location: Nuu Zeeelin Posts: 3,175	yeah, thats what would be meant, fan\|\|\|fan you might be best to mount the fans off centre so you don't have the dead spot and to spread the air out __________________ 2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans 2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water

12-15-2001, 02:45 AM	#9
AL666 Cooling Savant Join Date: Dec 2001 Location: The City Posts: 104	I have Black Ice 2 w/ 2 Delta 130CFM fans on it... Chip threw couple of those Deltas with my order as a complimentary gift... So why are you so worried about the fans man? Noise? It's not an issue anymore... Have you heard about a device called DigitalDoc5? ( If you heard about it, listen to this... By adding a relay switch to one of its headers it can automatically controls the RPM of your fan... (I'm afraid I'm going sound like I'm pimpin this freakin thing, but it seems like nobody's aware of its existence) Even the ioport.com guys are using this mod + auto shutdown mod for their pelt systems... come'on wake up... They came up with it couple of days ago after me and some other guys criticized them for not having even a warning device in their expensive rigs... BTW currently I'm working on the auto shutdown mode (trying to figure out how they did that basically:0) any help is greatly appreacited... I think it's a must have mod for all aquacooled system users, especially for the ones with peltiers...

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