3007WFP cannot display max resolution in Windows 7

arrgghh... I've not this option (optimus) in my bios. It's DELL Precision M6500 bios rev A02.

This is a very similar problem to what I'm seeing with missing some 16:10 resolutions. When I make custom ones it also says "Test failed" etc etc.  en.community.dell.com/.../20241862.aspx

And yes OK this is DVI-I I am talking about, however, perhaps you can bite the bullet and create a custom resolution of 2560x1599 and see if A) it passes the test and B) if it looks like native.   My bet is if it works, it will look identical to native rez.

I know its an old thread...but just for the record. Dell admin / moderators must be chuckling at this...but do they reply!?....maybe they are non the wiser:

You wont get 2560x1600  resolution if you are connected via the DVI-D ports on an E-Port series Port Replicator (unless this has changed since posting) - no matter what you do. They are actually only single link wired internally, despite the dual-link pin config. external appearance. Shame on Dell for not advertising this fact to the unknowing purchaser.

Active dual-link Dispslayport to DVI-D adapters are the only way to get that higher resolution. Check with the seller beforehand to guarantee its capable of that resolution, as some are misleading and only state dual link based also on the external pin configuration. The correct adapters typically have a USB cable also attached, to draw the extra power / bandwidth.

Harcourt,

You are correct. The E-Port series Port Replicator DVI ports are only single link DVI. The Latitude marketing team should have specified this when they sold the E-Port. When we marketed the 3007WFP, we specifically stated to get 2560x1600, the user must be using a video card that has DVI-D Dual Link ports.

I figured this out for all those struggling or those who will yet struggle with the annoying problem of the high res screen only doing 1280X800. 

Bottom line:  You probably need to buy an ACTIVE adapter to go from your existing DVI port on your computer to a DVI-D dual link cable to the monitor.  They run from about $50-$150.  My $50 Bizlink DP to DVI works just fine though.

Background:   Today (2014), most graphics cards and push 2560X1600.  And intel on chip graphics 4000 or greater can support it as well.  I'm using a Dell i7 gen 3 laptop using on chip graphics right now to type this on the 30" at full resolution. The laptop as most does not have a DVI output.  So when I tried to send the video out the HDMI port using a HDMI to DVI-D dual link adapter, there was just a black screen.  After some research, I found that Dell only outputs a maximum of 1080p out its HDMI port and from what I can tell the 30" 3007 monitor can only handle either 1280X800 or 2560X1600, nothing in between.  So the end result is that it always defaults back to 1280X800 if it can't get there.  So, here at work I have a docking station with two DVI-D outputs and 2 Display port outputs.  The DVI-D outputs have all 24 pins needed for dual link capability, but still didn't work using the DVI-D dual link cable.  So even though they are the full 24 pin dual link connectors, it turns out that the issue is one of 2 potential issues and likely both are the problem:  1) the laptop only outputs up to 1080p out of any DVI connection regarless of single or dual link capability and/or 2)the DVI connectors, though they appear to be dual link are in fact only wired for single link. 

After checking, I did find that DELL does output the full resolution of 2560X1600 out of their display port (DP) connections on the docking station.  So I did some research and found that they make two different types of adapters from DP to DVI-D Dual link, active and passive.  Passive can only handle up to 1080p.  Active has a circuit that does the processing needed to convert the DP up to full dual link 2560X1600 resolution.  Active, however, requires external power to run the circuits of the adapter and the power comes from a USB plug hanging on the adapter.  I found a cheaper $25 option on AMAZON that indicated that it was active and it looked different than the passive one from the same company, so I thought I would try it.  I was a bit skeptical because in the picture I did not see a USB cable connected and I hoped that it was detachable, alas when it showed up, there was no USB and when I tried to use it, the windows resolution indicated that 2560 was an option, but when I tried to access it, all I saw was garbled lines on the screen.  So much for the cheaper option and I would submit that the product was mis-labled and should not have had "active" as part of the product description.  I went back and bought a $50 Bizlink active DP to DVI D dual link adapter and once it arrived, I plugged it in and when I went to the windows settings, only two resolutions were available, the 1280X800 and 2560X1800, I selected the later and the resolution finally worked!  So hopefully, this can save you all about 4 hours of trouble shooting and 2 weeks of waiting for parts to arrive from Amazon.