Dell XPS 720 Mod - BTX to ATX

Face2Face

Diamond Member
Jun 6, 2001
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215
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The Dell XPS 700 Series to me are the best looking OEM cases ever made. I am in the process of doing the BTX to ATX mod and I wanted to post my project from start to end. This is my first time ever modding a case and I am really pumped to get this done.With my dremel in hand and some items from Performance-PCs I am off to work.

Here is what I started out with - Dell XPS 720 Red Special Edition

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I forgot to take a picture of the back of my case before I started to drill the rivets that held in the I/O Shield. Here is a stock picture of the back of the case.

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As you can see I need to change the the entire back of the case to get this to work. The I/O shield and the PCI expansion slots need to be switched.

I decided to order a Lian-Li ATX motherboard tray. They are around $30 bucks and will save a lot of time and make for a clean look.

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Here is where i cut the back of the case to fit the motherboard tray.

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I had to notch the area where the 120mm fan will go as you can see.

Then I installed the motherboard tray, using some nuts and bolts for the back and self tapping sheet metal screws to hold the tray.

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The tray fits nice and tight. It's not going anywhere. The Lian-Li motherboard tray I ordered only comes with a 80MM fan and cutout. 80mm fan is to small for exhausting air for the entire case, so I opted for a 120mm. I am not that good with a dremel and cannot enlarge the opening by hand, so I ordered a 80mm to 120mm adapter plate by nexus.

Problem is the fan gets in the way of the side door when you slide it on. I had to trim back the fan on the corner so it would fit. I tried pushing the tray up to the top of the case more but it left a big gap at the bottom -I guess I cut to much.

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The case came with a front fan bracket that came stock with the XPS. I decided that one 120mm fan will not be enough for this huge case as intake. I also need a fan to blow cool air to my video card. I cut some plastic out of the bracket and drilled some holes in it to use zip ties to hold the top fan in place.

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And the last thing I did for the night was to start the wiring for the power button and front panel. The connector was proprietary Dell of course, so I used some KK header connectors to make my own.

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That's it so far. That took me about 2 1/2 hours to do and I can't wait to start working on it some more. I also got the Dell 1000watt PSU with the case as well. The next step is to make the Dell 1000Watt power supply work with my ATX motherboard.

until then...
 
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Face2Face

Diamond Member
Jun 6, 2001
4,100
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Got a chance tonight to work on the Dell PSU. This unit is made by Delta and is one of the heaviest PSU's I have ever held. It is a 1000 Watt PSU with five 12V rails @ 18amps each. The PSU has a 24pin and a 20pin connector. The BTX motherboard that came with the XPS uses a 24pin(Same Pinout as ATX)and a 20pin -Not a 4 or 8 pin EPS connector.

20_pi124.jpg

I used two pins (the ones used for sewing) to remove all of the pins from the 20pin connector.


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There is a lot of 12V wires here! So I made a 6Pin PCI-E, 4Pin EPS and a 8Pin EPS. I went ahead and sleeved all of the additional wires to match the rest of the PSU. The problem was the heat shrink I had was to big, so i used some electrical tape instead. Kinda ghetto, but the 4 pin will be the only connector used for the time being. I have a nice extension for it as well. The PSU now has a total of 5 PCI-E 6pins with one 8 pin PCI-E adapter.
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There is also a weird short connector coming out of the PSU. I found out this is used for the XPS Water-cooling setup. I cut the connector and turned it into a 4pin molex.

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I also removed the floppy connector and turned that into another 4pin molex. Who uses a floppy?

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Last but no least I started to work on the LED's on the front of the case. Since the front bezel is red, I only want the Red LED's to work. Mixing the front bezel with purple, blue and yellow etc.. would look kinda stupid. The front LED's will do about 7 different colors in total. I used a small two way switch and drilled a hole in the 3.5" bay blank plate. There I will mount the switch to turn the LED's on and off. I am doing because I don't want to see a Red glow under my desk all of the time. It's pretty easy to wire if you are only using one color. I am using one of the LED's and a 9v battery to test the wiring - -and yes it works!

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Face2Face

Diamond Member
Jun 6, 2001
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Looking good so far, i cant help but ask why you would do this though... :p

Haha.. good question. I have always liked these Dell XPS cases and I had a chance to get one as a trade for some DDR2 memory. I also wanted to do a case mod and have something different looking sitting under my desk. I am posting this project on the forums because I would like to help anyone else how may attempt to do this as well. This all may seem crazy, but it is a learning experience and is also very fun. Thanks for the question.
 

Face2Face

Diamond Member
Jun 6, 2001
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Finished wiring the front LED switch. If anyone would like a diagram I can draw one up, it was pretty easy just looks like a mess. The media card reader will go on top.


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The top and bottom LED's work! I installed male molex pins on the power and ground so I can plug them directly to a 4pin female molex - 5V (Red wire) and ground.

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Face2Face

Diamond Member
Jun 6, 2001
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Well I had some more time this weekend to work on the project. I the cleaned out the case and wiped it down. Ready for installation.

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I put all of the parts into the new case and did a quick start test to make sure everything is working. Awesome it all works! The front USB ports work as well. The connector may need to be shaved a little bit, but it still has the normal pin configuration. The front audio jack does not work - No a big deal for me.

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I then turned my attention to the cable management inside the Dell. It was more work than I anticipated. I did the best I could using what I had. I still have some tweaks to do on the PSU wiring - almost there.
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I have Velcro holding the SSD in place.

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I was also going to cut the back bezel for the case but of course my dremel tool decided to kick the bucket.... Gotta RMA that as well.

It's getting there, still not 100% - but close.


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mnewsham

Lifer
Oct 2, 2010
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Wow, looks pretty good, certainly wouldn't expect those internals though :p A nice surprise.
 

Face2Face

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Jun 6, 2001
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Update

Jan/2013

The case has now been moved to my Media Server. Still silent and beautiful, but not my main machine anymore.
 
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enol

Junior Member
Jun 27, 2012
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Got a chance tonight to work on the Dell PSU. This unit is made by Delta and is one of the heaviest PSU's I have ever held. It is a 1000 Watt PSU with five 12V rails @ 18amps each. The PSU has a 24pin and a 20pin connector. The BTX motherboard that came with the XPS uses a 24pin(Same Pinout as ATX)and a 20pin -Not a 4 or 8 pin EPS connector.

I used two pins (the ones used for sewing) to remove all of the pins from the 20pin connector.

2012-04-18185117.jpg


There is a lot of 12V wires here! So I made a 6Pin PCI-E, 4Pin EPS and a 8Pin EPS. I went ahead and sleeved all of the additional wires to match the rest of the PSU. The problem was the heat shrink I had was to big, so i used some electrical tape instead. Kinda ghetto, but the 4 pin will be the only connector used for the time being. I have a nice extension for it as well. The PSU now has a total of 5 PCI-E 6pins with one 8 pin PCI-E adapter.

2012-04-18215048.jpg

hello!!!

my first post here.

My XPS 710 that was given to me last year just died a couple of weeks ago. So I will be doing this BTX to ATX.

Is the 20-pin on this XPS all are +12V (white, blue-white, yellow-white) and GND (black)?

thanks
 
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Johnnyprc

Junior Member
Jul 10, 2012
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wow, you have inspired me to try this too. Is there anything that I should know? I am going to order the mounting plate right now.
 

Smoblikat

Diamond Member
Nov 19, 2011
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Nevermind, the mod looks great. Im assuming you did this for fun, unless you think that this case is better looking than all other non-OEM cases as well.
 

Face2Face

Diamond Member
Jun 6, 2001
4,100
215
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Face2Face

Diamond Member
Jun 6, 2001
4,100
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wow, you have inspired me to try this too. Is there anything that I should know? I am going to order the mounting plate right now.

The LED wiring can be a little tricky, as well as the power button wiring. Everything else is pretty easy. My advice, take your time. You can PM me for faster responses. Thanks!
 

Face2Face

Diamond Member
Jun 6, 2001
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Nevermind, the mod looks great. Im assuming you did this for fun, unless you think that this case is better looking than all other non-OEM cases as well.

Yes I did this for fun. This case does not have the best airflow and there are better looking cases on the market. I did this because is was fun and a learning exp, plus I wanted something different. Everybody has the same cases these days.
 

OVerLoRDI

Diamond Member
Jan 22, 2006
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The wiring job is fantastic. It looks so clean.

Not really a fan of those Dell cases, but I can't knock you for that. Great job!
 

Face2Face

Diamond Member
Jun 6, 2001
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215
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The wiring job is fantastic. It looks so clean.

Not really a fan of those Dell cases, but I can't knock you for that. Great job!

Thanks! I gotta say it was a PITA to hide the wires in this case. I wish I had tray I could hide everything behind :)
 
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pasciaka

Junior Member
Sep 5, 2012
1
0
0
GreenHell6,
I've aquired a Dell XPS 720 Red Edition and im trying to use the 1000watt PSU that came in it for my current computer, except i dont know where to find a wiring diagram or what ever resources you had to swap the wires correctly into more molex cpu 4pin and 8 pin connectors as well as more PCI-E connectors. Im mainly doing this because its a 1000watt supply and itll power my two free 88000GTX's ;) So if you could help me out with what ever information you got id be greatly appreciated!
 

Face2Face

Diamond Member
Jun 6, 2001
4,100
215
106
GreenHell6,
I've aquired a Dell XPS 720 Red Edition and im trying to use the 1000watt PSU that came in it for my current computer, except i dont know where to find a wiring diagram or what ever resources you had to swap the wires correctly into more molex cpu 4pin and 8 pin connectors as well as more PCI-E connectors. Im mainly doing this because its a 1000watt supply and itll power my two free 88000GTX's ;) So if you could help me out with what ever information you got id be greatly appreciated!


Just to let you know, your 8800 GTX's should have two 6-pin PCI-E connectors each. The Dell 1000Watt PSU has that already. So you may not need to make anymore PCI-E connectors.

Here is the Pinout guide for the 1000 watt PSU.

http://support.dell.com/support/edoc....htm#wp1228674

The 20 pin connector used on BTX boards has no use on an ATX board. The 20 pin is just a bunch of 12v's and grounds. You have a bunch here, so you can make more 6pin or 8pin PCI-E, P4 4pin or 8pin. You can also do a 12v molexs if you want, not sure if you would need them. Also, make sure you have the Dell PSU power cord that plugs into the wall socket. These are proprietary and to my knowledge will not work with standard PSU power cords. You can either buy one on ebay or switch our the plug to accept standard power cords.

let me know if you have anymore questions. You can send me a PM through Anandtech.

Thanks!
 

Sportin

Junior Member
Oct 3, 2012
5
1
0
Hi...I am about to install an Intel board D955XCS (BTX board) into this case. I know that you mentioned that there were some proprietary issues with the PSU. I might just swap it out to make life simpler. Could you please provide me the wiring diagram for the front leds and power button. I'm hoping everything else, ie fans etc.... will just plug in and work. I will have to verify the pin outs first.
Thanks!
 
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Face2Face

Diamond Member
Jun 6, 2001
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Before I attempted to do this I spent some time looking on the web. Here is what I came across. This helped me a great bit. Good luck!

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