Dell Workstation Owners Club

[Retrorockit]

There is a discussion of the 150x50mm fan back on page 28 in this thread. It runs 2000RPM and while the fan itself is pretty quiet if you turn it up you will hear a bunch of air moving around.
On my Optiplex 380 X5470 (120W) Prime 95 small FFT =42* C.
On page 24 in the Throttlestop overclocking thread there is a Dynatron heatpipe cooler mod for the T3500 that might be an option. The fan shown was for Manguptas 40*C. ambient situation. But that type of thermal controlled fan only needs 12V. to run.

On page 17 of this thread is another fan/cooler mod.

 

[rightbison]

What cooler are you using? Have attached a fan to it directly? If you haven't, you need to.

I'm using the cooler I showed from previous post.
The 0W715F and it does have a fan attached to it. I seen it and the fan is working, but as mentioned i can't control the fan speed. Not sure about that.

 

[Retrorockit]

That's the heatsink and fan for the 2nd T5500 CPU. Basically the same as the T3500 heatsink with a fan added. If you splice the blue wire to the blue wire on the CPU fan they should be able to share the PWM signal. If you disconnect the Blue PWM wire it will go to 100% speed.

HWInfo64 which I think is an Unclewebb product has a sensor tab that allows fan speed control. I got 2500RPM out of my 150x50 fan so I gues that's the max. speed. i got 47-51*C running small FFT so that's where i'm actually at with my Opti 380. 42*C. might have been with the light TS benchmark running. If you have the CPU fan tied into one of the MB headers it should work.

 

[lexluthermiester]

The 0W715F and it does have a fan attached to it. I seen it and the fan is working, but as mentioned i can't control the fan speed. Not sure about that.

Ah there is the problem. Don't use Dell fans connected to the mobo. Use an aftermarket fan connected through a molex adapter for the CPU heatsink.

 

[rightbison]

Ah i see. So i can use the 0W715F heatsink and have a 80mm fan and connect it to molex.

Would it be crazy to replace the fans on the fan assembly? I also want to replace them with aftermarket fans but i don't know what size they are and not sure if it would be worth it.

 

[ManGupta]

Ah i see. So i can use the 0W715F heatsink and have a 80mm fan and connect it to molex.

Would it be crazy to replace the fans on the fan assembly? I also want to replace them with aftermarket fans but i don't know what size they are and not sure if it would be worth it.

Have a look at this NIDAC fan. You can mount this 90 mm fan to the cpu heatsink and run it connected directly with 12V connection ......... still it will have PWM function as it has a thermal sensor of its own in form of a blue capacitor attached to fan motor. It has 130 CFM it cost $15 on aliexpress.

For $ 16.50 you can also get 259 CFM 150 mm X 50 mm Delta fan, but its huge and not meant to be mounted on the heatsink but it can replace the T3500 Front fan assembly.

15.74US $ 25% OFF|Ta350dc M35105-58 Case Cooling Thermal Sensor Fan 12v 1.8a 3-pin (3-wire Lead) 90mm X 90mm X 38mm - Fans & Cooling - AliExpress

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22.0US $ |used Free Shipping original blower fans AFC1512DG 15050 15cm 150mm DC 12V 1.8A NC466 powerful server inverter cooling cooler|blower fan|inverter cooler12v dc cooler - AliExpress

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[lexluthermiester]

Ah i see. So i can use the 0W715F heatsink and have a 80mm fan and connect it to molex.

Yes, exactly. That is what I and many others are doing. I'm using a 1800rpm 80mm fan with a 3-pin to molex adapter(which came with the fan). It keeps the CPU cool and it's near silent. I can only hear it when the side of the case is off and then only just.

 

[ManGupta]

5700 RPM NIDAC FAN Speed Demo

This video explains the Principles on which a Thermal Resistor Controled Fan Works

 

[lexluthermiester]

5700 RPM NIDAC FAN Speed Demo

This video explains the Principles on which a Thermal Resistor Controled Fan Works

That would be a tad to fast and noisy for what is needed of it. Interesting though!

 

[ManGupta]

That would a tad to fast and noisy for what is needed of it. Interesting though!

As long as it is controlled by the thermistor, it wont speedup so much, hence relatively quieter. But if CPU temp rises up the fans speed up and noise level rises.

The one in the video is running at full 5700 RPM by sorting the two legs of the thermistor to run at max speed.

Have You Noticed one thing .........

The Fidget on the outer edge speeded faster than the one at the center nearer to the fan.

As Retrorockit had posted in his post .......

Fans generally have tendency to spread out air towards the outer boundaries leaving dead spots at the center thereby reducing the cooling effect on the heatsink because the heatsinks are placed at the center of the fan.

Hence there is need to redirect the air from the outer boundaries back towards the center (towards the heatsinks.)

So I have been so long under estimating the ROLE OF AIR DUCT in cooling solutions.

Thanks to Retrorockit to make me aware about this phenomenon.

 

[lexluthermiester]

As long as it is controlled by the thermistor, it wont speedup so much, hence relatively quieter. But if CPU temp rises up the fans speed up and noise level rises.

That's the problem, the on-board connectors in T3500/T5500/T7500 systems generally don't ramp up the fan speed until the CPU is already hitting TJmax. Whereas a steady state fan will provide the needed airflow at all CPU load states and thus the CPU will never overheat. Most 1800-2400rpm fans are very quiet these days, are inexpensive and generally very reliable.

 

[ManGupta]

That's the problem, the on-board connectors in T3500/T5500/T7500 systems generally don't ramp up the fan speed until the CPU is already hitting TJmax. Whereas a steady state fan will provide the needed airflow at all CPU load states and thus the CPU will never overheat. Most 1800-2400rpm fans are very quiet these days, are inexpensive and generally very reliable.

This fan does not uses the on-board connectors in T3500/T5500/T7500 systems.

It uses its own thermistor, a blue colored resistor connected to the motor of the fan to control the fan speed based on temp of air passing through it.

 

[Retrorockit]

I agree with Lex that Dell speeds up the fans too late. If you can get HWInfo64 to work you can set a faster idle speed on the 120x38mm CPU fan. It's actually a very good fan. Another option is to run the thicker 90x38mm fan as a 2nd CPU fan like Mangupta listed which moves more air per RPM. Instead of shorting out the thermistor as shown in the video you could connect a variable resistor in parallel to increase rpm as needed manually. But it's probably overkill for anyone except Mangupta.

 

[lexluthermiester]

It uses its own thermistor, a blue colored resistor connected to the motor of the fan to control the fan speed based on temp of air passing through it.

Oh I see. To work correctly, one would need to turn the heatsink backwards and mount the fan pulling air through the heatsink so the thermistor can detect the temp of the heat coming off the CPU.

 

[ManGupta]

This video explains how to repair / fix a very noisy fan.

Oh I see. To work correctly, one would need to turn the heatsink backwards and mount the fan pulling air through the heatsink so the thermistor can detect the temp of the heat coming off the CPU.

Correct. And it should run from 12v directly and let the thermistor do it's job.
It has got the Dell 5 pin connector, but it is not advisable to put in Dell mb fan header otherwise
1) Dell mb shitty fan controller will also control it.
2) it draws more amperage. Dell header is for .9 amperage but this fan draws 1.8 amp that is twice of that. So it would be safer to run directly connected to 12 volts.

 

[lexluthermiester]

This video explains how to repair / fix a very noisy fan.

Correct. And it should run from 12v directly and let the thermistor do it's job.
It has got the Dell 5 pin connector, but it is not advisable to put in Dell mb fan header otherwise
1) Dell mb shitty fan controller will also control it.
2) it draws more amperage. Dell header is for .9 amperage but this fan draws 1.8 amp that is twice of that. So it would be safer to run directly connected to 12 volts.

That video lost me at "use butter". Butter degrades badly over time and with the heat the fan coils generate. Dielectric grease is infinitely better and will not degrade over time. White lithium grease will also work well.

 

[ManGupta]

That video lost me at "use butter". Butter degrades badly over time and with the heat the fan coils generate. Dielectric grease is infinitely better and will not degrade over time. White lithium grease will also work well.

Yes only grease can last longer and one is not going to do this exercise every couple of months, so only something like grease that last longer make sense.

If one donot want the hassle of whole disassemble and reassemble of the fan, one can just remove the sticker and rubber cover and drop few drops of motor oil using a dropper, and it also may work.

 

[lexluthermiester]

If one donot want the hassle of whole disassemble and reassemble of the fan, one can just remove the sticker and rubber cover and drop few drops of motor oil using a dropper, and it also may work.

I've done that. Over the years I've found that synthetic 10w40 motor oil mixed 50/50 with dielectric grease and injecting it with a dentists syringe works wonders.

 

[Valantar]

That video lost me at "use butter". Butter degrades badly over time and with the heat the fan coils generate. Dielectric grease is infinitely better and will not degrade over time. White lithium grease will also work well.

Yeah, that's some terrible advice. The butter will likely split, and the milk solids will - at best - gunk up the shaft, though they'll likely start growing mold after a while. Especially inside of a warm place like a fan hub.

Besides that, the video seems to assume all PC fans have the same type of bearing. Some can be maintained, some can't, and some will break if you try to take them apart.

 

[Retrorockit]

Oh I see. To work correctly, one would need to turn the heatsink backwards and mount the fan pulling air through the heatsink so the thermistor can detect the temp of the heat coming off the CPU.

Yes they're exhaust only fans. But they self regulate so don't need a MB PWM header to run. They come in other sizes and power ratings, but Mangupta needs to use 40*C. air for cooling so he needs a lot of it!

 

[Jriker1]

I have owned from the beginning two Dell Precision R5500 rack mount units. Am looking to upgrade them for a couple reasons:

1. To get faster CPU processing for my video encoding which these devices do. Today have two of the 2.40 GHz XEON's.
2. I want to get 6 Gbps SSD drives for this system but the included PERC 6/i isn't going to cut it.

Couple recommendations I'm looking for:

1. Think the X5690 or the X5675 CPU is better to get? I know the 5690 is faster but seems the 5675 is not noticeably slower and uses less juice. That said open to recommendations.
2. I know people think the PERC H700 supports full speed SSD but not 6 Gbps only 3. Was considering going to the H730 or H740p. Any thoughts? Cable ends are different so will have to order something specific for my setup and hope it works.
3. One other thing. I keep hearing about 2.5" and 3.5" backplanes. Is this basically just the size of the drive the bays support? Mine has 6 2.5" bays in it. For some reason people are saying the cable that connects to the backplane is different between the 2.5" and 3.5" and even though they both connect, it won't work? As far as i can tell it's just a SFF-8087 right angle connector so not sure.

EDIT: And by the way, a lot and I mean a lot or most of the CPU's like this you can buy on eBay are from China. Should I be skeptical?

Appreciate the input on my upgrade plans.

Thanks.

JR

 

[lexluthermiester]

1. Think the X5690 or the X5675 CPU is better to get? I know the 5690 is faster but seems the 5675 is not noticeably slower and uses less juice. That said open to recommendations.

X5675's are good CPU's and are much better performers than the 2.4ghz that you have in there now. However since you mentioned the X5690, the X5680's are the better option as they are only 133mhz away from the 5690's but 333mhz above the 5675's. If you can get them for a good price, they're worth it.

2. I know people think the PERC H700 supports full speed SSD but not 6 Gbps only 3. Was considering going to the H730 or H740p. Any thoughts? Cable ends are different so will have to order something specific for my setup and hope it works.

From what I've read, stay with the Dell H700. The other two are very expensive, unless you're ok with that expense. Otherwise you will just not notice the difference in speed, especially with multiple drives connected.

3. One other thing. I keep hearing about 2.5" and 3.5" backplanes. Is this basically just the size of the drive the bays support? Mine has 6 2.5" bays in it. For some reason people are saying the cable that connects to the backplane is different between the 2.5" and 3.5" and even though they both connect, it won't work? As far as i can tell it's just a SFF-8087 right angle connector so not sure.

That depends on how they connect. There are several differing configs out there. Show us pictures of your unit so we can see which setup you're running.
It's the power delivery to the drives that is the worry. If your backplanes deliver power as a part of the assembly then the cable you mentioned should work. If not, then you'll need a cable similar to the following;

Pardon Our Interruption...

 

[Jriker1]

Thanks for the input.

X5675's are good CPU's and are much better performers than the 2.4ghz that you have in there now. However since you mentioned the X5690, the X5680's are the better option as they are only 133mhz away from the 5690's but 333mhz above the 5675's. If you can get them for a good price, they're worth it.

I saw that X4580 CPU, but problem I had is it was never listed as an option for the R5500. Think the T7500 had it but not the R5500. Not sure if being Dell and all, if it would load that CPU being as proprietary as they are with things.

From what I've read, stay with the Dell H700. The other two are very expensive, unless you're ok with that expense. Otherwise you will just not notice the difference in speed, especially with multiple drives connected.

I had some people say if you put in a 6Gbps SSD drive it will link at 6Gbps. But the manual says otherwise. They say it was enabled with some firmware updates but concern I have is how do I really know before I start buying used H700 cards and adapted cables and the like.

That depends on how they connect. There are several differing configs out there. Show us pictures of your unit so we can see which setup you're running.
It's the power delivery to the drives that is the worry. If your backplanes deliver power as a part of the assembly then the cable you mentioned should work. If not, then you'll need a cable similar to the following;

Pardon Our Interruption...

Definitely believe the backplane powers the units. I believe only two SSF-8087 right angle connectors connect to the backplane and from there to the card with the bigger PERC 6/i cable. As soon as I'm done encoding on this box I'll open the top and provide images. Need to measure the length of the cables anyway if I'm going to replace them. I can basically tell you this is what they look like:

https://images-na.ssl-images-amazon.com/images/I/812HcJnelFL._SL1500_.jpg

Almost wonder if there is an adapter from those big connectors to standard SFF-8087. Maybe there is and can just do that if the big connector ends don't get in the way.

Thanks.

JR

 

[lexluthermiester]

I had some people say if you put in a 6Gbps SSD drive it will link at 6Gbps.

Only if both the drive and controller are 6gbps compatible. Otherwise one or the other will sync down to the fastest speed possible both can reach.

 

[Jriker1]

Only if both the drive and controller are 6gbps compatible. Otherwise one or the other will sync down to the fastest speed possible both can reach.

Thanks, yeah kind of new that. My comments are around if the H700 is really capable of 6gbps with SATA SSD. If you aren't sure or have experience directly with that unit maybe someone else will know.

Thanks.

JR