xps 720 extra fan

Question

Looks like there is room for a 92/120mm exhaust fan at the rear of the XPS case. Anyone actually throw one in? If so, where the heck is the connector on the motherboard??? Pictures would be nice :)

Thanks to all!

Davet50 · Answer

Yes there is someone else who has done this the fan holes on the back line up. Use the connector that the H2C would plug into..

kill_dash_nine · Answer

And where does that plugin?  :)

Davet50 · Answer

i believe it is #26 on sys board Broken link has been removed from this post by Dell>

steve_89 · Answer

I know ur getting the qx6850 and were i think asking abt the h20 units too.The 720 case has already a great airflow compared to older models.Id first try it without a extra fan,u might be suprised just with the new chip.

John XPS 700 · Answer

If you have an H2C model...is there no extra connectors for a exhaust fan?

kill_dash_nine · Answer

I'm not 100% sure, but that connector does not look like a standard 3 pin fan connector. I think I am going to go with connecting it to a 4 pin molex from the power supply. The only downside is that the fan will not be regulated/controlled and will run at full rpm regardless of temps.

Get a quiet enough fan, and I think the 4 pin connection would work just fine.

I get my fan in on tue/wed, so I will let you guys know. I'm going with a 120mm Scythe fan ---> here

junior06 · Answer

you add the extra fan? Where are you mounting it? I want to add a fan for the dual sli cards.     Anyone added the h2 aftermarket or as an addon?   Mike

Gontue · Answer

I still don't understand why anyone feels the need for an additional fan. I do heavy gamming with my XPS 720 and it never over heats.

Heres some links to old posts about adding a fan.

http://www.dellcommunity.com/supportforums/board/message?board.id=Tech_Talk_XPS&message.id=21417&query.id=419345#M21417

http://www.dellcommunity.com/supportforums/board/message?board.id=Tech_Talk_XPS&message.id=24516#M24516

XPS 720 H2C
QX6700 2.66GHz Overclocked to 3.47GHz
4GB RAM
Dual 768MB nVidia GeForce 8800GTX
SATA RAID 0 with Dual 160GB 10k RPM Hard Drives
X-Fi sound card
Ageia PhysX Processor
1 kilowatt Power Supply
Windows XP Pro

Message Edited by Gontue on 02-24-2008 11:32 PM

Message Edited by Gontue on 02-24-2008 11:34 PM

kill_dash_nine · Answer

My QX6850 runs a little warm when overclocked. SO my reasoning is that the intake fan and the exhust fan line up with the CPU heatsink - thus creating a constant wind tunnel passing through the case. In theory, it should help reduce the cpu temps.

Anyone doubt this logic?

kill_dash_nine · Answer

Overkill.. I'm not sure of.

Granted the XPS 720 works fine given Dell's preset parameters, but if you venture slightly outside of those parameters, such as overclocking - you may need to adjust your thinking and or your PC.

Granted the 2 fans are good sized, they are only intake fans. An exhaust fan can only increase the airflow over the CPU, thus removing heat, thus reducing the CPU temps. There are holes for an additional fan, so maybe Dell originally thought a fan would be needed, then realized that the temps didn't get that high under their preset parameters - so they left out the fan to save $10 per XPS 710/720.

All will be know in a few days when my 120mm fan comes in.

PS: The fan I am getting has rave reviews for being pretty quiet - so maybe I won't notice it. If I can get back of to 3.67 on my QX6850 (comfortably) then a little extra fan noise would be worth it.

Gontue · Answer

Well, it may reduce the temp a little. However unless your having overheat issues it's overkill. Those two fans in the front of the XPS 720 are huge. Should the temperature inside the case or at the CPU get too high those things will go into high gear and I dont know if you could sit in the same room with them blasting away like that for long.

If you use ntune, go in and tickle the fan settings. Ntune doesn't work right and it will speed the fans up but it won't slow them down. You need to fiddle with the settings (increase speed click apply, increase speed click apply, increase speed click apply, you get the idea) but you can get the fans on their highest setting. They blast air. To reset them you need to restart the computer.

I would love it if Dell would give us some sort of control over the fan speeds. They should make it so the user can speed the fan up over the automatic setting but not slower than the minimum speed the mother board calls for.

There are times when I'd like to speed up the CPU fan just a few notches and ntune isn't a good way to do it.

XPS 720 H2C
QX6700 2.66GHz Overclocked to 3.47GHz
4GB RAM
Dual 768MB nVidia GeForce 8800GTX
SATA RAID 0 with Dual 160GB 10k RPM Hard Drives
X-Fi sound card
Ageia PhysX Processor
1 kilowatt Power Supply
Windows XP Pro

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xps 720 extra fan

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