Make sure you are up to date bios 1.0.3. the memory you need is 12GB memory 3 x 4GB A2507437 PC3-8500 DDR3 1066MHz Unregistered DIMM . this works in the machine. it does run about 400 a chip tho. http://www.memoryupgrade.pro/dell-memory-upgrades-dell-ram-expansions-xps-xps-730x.html 

The 730x is only compatible with 240-pin memory modules.  I use the PC3-16000 memory, and have been since February, with no problems.  There's a chance that the ram you received could've had a defective module or two.  It's been known to happen.  When I purchased my first Corsair Dominator DDR3-1600 triple channel kit, one of my modules was defective and I had to return the whole kit.  When the other kit arrived, it installed and hasn't given me any probs or errors.

I just now see the 1.0.5 update. I will install now. I onlt been 1 week since I checked

The latest BIOS release is 1.0.5.  I've been rather curious about swapping this 730x mobo out for an EVGA X58 but I've not had any issues whatsoever with my current setup.  I guess I've been one of the lucky few.

I'm going out of my mind trying to find 4gb modules for my XPS 730x H2C with the 1.0.5 bios. I currently have 6gb installed. I use my machine for graphics and editing and would love to have 12gb in it.

I tryed to order this...

http://www.memoryupgrade.pro/4gb-dell-xps-730x-desktop-memory-1x-4gb-a2507437-pc3-8500-ddr3-1066mhz-unregistered-dimm-upgrade.html

but they said they are out of stock even though it says its instock on their website and don't know when they will have it. I'm not sure it even matches Chris Mixxon's spec for a 4gb module that was tested.

Can anyone share a link to a 4gb module that works? What about this one?...

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231313

thanks in advance

Hi,

Did upgrading to BIOS 1.0.5 work for you?  (ie were you able to get to 12gb and the memory posted?)

I have a 730x system, with the i7 965 OC'd.  Been trying for two weeks to install my Crucial 3 x 4gb memory kit (1333 mhz, 240 pin sdram).  Saw this thread, and upgraded the BIOS to 1.0.5, and my system still doesn't recognize the modules!  Been on the phone with Dell tech 5 times and this is starting to drive me crazy.

It seems like you went through the same hassle a while ago, any advice you can give, I would appreciate.

Thanks

I have the 730X-H2O which is about 8 months old.  The motherboard in mine is actually a "Rage".  it came with 6 Gigs which was what Dell claimed was the max

when I purchased it.  anyway I used the Kingston 12 gig kit at $1200.00 for 3 ddr-3 4 gig modules.  The key at that time was finding "NON-ECC" "UN-REGISTERED"

4 Gig modules.  For some reason they cost more than eth ECC and Registered modules.  Wish I had waited for the Crucial but I wanted the best and baddest , which I am confident that almost any XPS 730 is.  Mine has 2 Nvida 280's in SLI (thought about upgrading to 2 295's but do not really use the computer as much as I thought I would.

4 WD Raptors and a partridge in  a pear tree  ha ha ha

JUST REMEMBER TO WATCH OUT FOR THE "NON-ECC" and "UN-REGISTERED"  I've hear of people getting the other type to wor but the board manufacturer (FOXCONN) says it will not

They still make the Kingston kit if you are  desperate  but it's still like $1100.00 from "what a hen lays" don't want to get into hot water about using vendor names

Just rechecked and they aren't available for where I purchased them but here is the info for reference

Kingston HyperX 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) XMP Desktop Memory Model KHX1600C9D3K3/12GX - Retail

Intel XMP Ready

Good Luck

Seabee

I think you bought the wrong ram. I don't think the XPS 730x supports 1333mhz ram. Take a look at the XPS FAQs

The only place I've found that said they have ram that works for the XPS 730x is Pro Memory Upgrade...

http://www.memoryupgrade.pro/4gb-dell-xps-730x-desktop-memory-1x-4gb-a2507437-pc3-8500-ddr3-1066mhz-unregistered-dimm-upgrade.html

but when I bought it online 2 weeks ago, they emailed back saying sorry that it wasnt actually in stock and would let me know when they might have but had no idea right when.

So I'm trying this another one from Newegg but I havent received it yet. The specs look the same as the one on Pro Memory Upgrade so I'm keeping my fingers crossed.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231307

I'm happy to report that the 4gb ram modules I got from Newegg are working great. $190 a sticks.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231307

going from 6gb to 12gb has helped my after effects work. I see a 20% impromement in render times so far.

I have the XPS 730x H2C with the 1.0.5 bios

Thanks for the info I just bought my 703x from the outlet center - only draw back - ram 3gb

Glad it helped  someone. My machine is still running great with the ram i got. I still have my 6gigs(3x2gig sticks) of ram that im not using any more, if you are interested.

               I found some 2 gb Dell ram locally here in the DFW area. my next move will be an clean install from vista to windows 7 pro - raid the two hard drives -then relaod drivers - Oh boy !

Does anybody know if the 1.0.5 BIOS update expands support for PC12800 - 6GB 1600Mhz  RAM? Will I still need to change my BCLK to get my RAM to run at 1600Mhz or does the 1.0.5 BIOS fix this and recognize 1600Mhz immediately without having to do anything.

Does anybody know if the 1.0.5 BIOS update expands support for PC12800 - 6GB 1600Mhz  RAM? Will I still need to change my BCLK to get my RAM to run at 1600Mhz or does the 1.0.5 BIOS fix this and recognize 1600Mhz immediately without having to do anything.

The 1.0.5 BIOS allows for use of the DDR3-1600 RAM but for you to run it at 1600MHz, you'll have to follow the steps I gave you in the 730x General Discussion thread unless you have an i7-965 or higher CPU.