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It will not make a difference now, all the effort and time it takes to make
All these tests Has come on Deaf Ears! Not matter how much sense it makes to keep
1888 it really come down the effort or the lack of effect on dev. part .
As users we suffer at the hands of miss direction by the form higher up.
So for me Magic Latern Stops at Feb16th for MLV and Oct24th for Raw
As these builds Can Not be improve on as they are maximized right now .

Are the Lexar Cards really that magic or am I doing something wrong? I got a little excited and tried to test things out again but can't get anywhere near those speeds, i have to step down to 1728x972 to shoot continuous 16:9 on a Transcend 32gb 1000x. Or instead I shoot 1880x800 anamorphic and upscale to 1920x816 for 2.35. Last summer I assumed Transcend had really good build quality, but does the brand of the card make that much of a difference?
Tried on both Oct24th Build and the Newest Build

Yes I thinks so, Lexar 1000x cards seem to work better with 5d2, but my 64GB card is faster then my 32GB.
I always get better number then most, I usually shoot at 2:1 or 1.85:1 (1873x936 mlv & 1880x1014 raw)
Crop mode for continuous at 2048x930 (that's my favorite size)
*Note* even thou I can record at 16x9 (large frames 1880,1872) its not stable with HDMI devices, I choose to use 1.85:1 or 2:1
with those sizes . 

Edit: Also check your card for being fragmented , I notice when the card slow down a little it's always fragmented by about 30%.
If you are working in Windows , I do a disk defragment & the speed always return . FYI the maximum write speed I have seen on
my 5d2 with Lexar 1000x is 79.8 MB/s ,but only in Crop mode 1:1 is around 75 MB/s on average.
For MLV try the Nightly Build from Feb16th, that seems to be the Fastest I have found to work with 5d2 @ 1872x936 2:1 .
That's the one I use for paid work, after that date things started to slow down and became unstable.

@Reddeer
You mentioned card warm up off in a previous post as you think Lexar do not benefit from this? Still stands?

Yes and no, what I mean is I see no benefit's to card warm ups to continuous record but, as the card gets Hotter
It seems to stabilizes at a higher writing speeds with less buffering. I really see it when the camera hit about 64-67 degree C
and in Crop mode when I push it at 2048x1024 and can get about 2000+ frames. But I think when I change from small jPeg photo in
the Canon menu to small raw that's when I Notice a Big difference in performance. I would say 15-20% even to be the
difference between continuous and Not.
With the Oct24th build of course

1880x1058 ? so 16:9 ?

Can you post what settings you were using? or pm me

yes, 16x9 . I use Small raw for photo in canon menu
Hacked preview ,with white rectangle frame, small hacks on
No overlays of course when recording raw, on a "freshly" formatted card.
I never change formats without formatting the card, I think this makes it
More stable & faster all on Lexar 1000x 64GB, 32GB .

Oct 24th Raw a.d. Build has 1880, I still use this built as
It is the fastest built to date for the 5d2.
They never being able to match this build since then it being down hill
For performance for the 5d2. FYI I can record 1880x1058 continuous.
So you better download it before they remove all old builds !

Well i though that's what we are doing, discussing this issue .
And from what I read here the community of 5d2 users  would like to keep
The upper resolutions in the new version of the code.
@Ted no that's not a miss print, that's right 1888.

It looks like all Hope is Lost for the 5D Mark 2 this sadden me Greatly ! 
What camera will be Next , All for the greater good of the 5D Mark 3 !
I guess in the end the dev. can write all the code there want but, if not one uses
It what good is it.
I thought Magic Lantern was user base group who all have say in the end result
Maybe I'm wrong.

Glad you got it to work , happy to help

1856 will still be there so no worry about performance , there saying we will Loose
The upper resolutions  1880, 1872 no more ! You are missing the point here there will be no
Loss to Photo functions and have nothing to do with that Just Raw Video, That's what is
Is all about !

I would vote for letting the developers decide, but would encourage to keep it simple. Exceptions might be added later (if really needed). If kept simple, more time can be put into other work, and the releases might get even more stable.
Again, thanks all devs for great work!

What do mean, it's all readly stable !
The problem is with all the other cameras e.g. 5d3,6d . Read the link that a1ex talk about.
There  asking the 5d2 user if there want 1888 or 1856 , Do Not leave This in the hands of the
Other people to decide for you ! Just because some more work , beside all that
The 5D Mark2 should be not limited , Its the Camera that Started
The DSLR  revolution and gave Birth to Magic Latern ! So let make this camera
The best it can be even it we have to put more work in the code. It's well worth the extra
effort .

P.S. My test for this are still on the way   

Always Thanks for your film production wisdom, what do you thinks about Valentino's workflow? What do you think is the best workflow to preserve image quality when up scaling to 2K or 4K?

OMG I Can believe how many steps he is going though !and with Known problem software, e.g. Quicktime Pro (bad gamma shift)
Anyways I will not waste my time with Valentino's workflow, Its very inefficient with poor results , but each to there own.
I made I new version of the 4k upscale tutorial below,  but even this one is outdated a little since I posted it 3 mouths ago.

And to be clear this is just testing and if it was to be use, only as  B-Roll and at that just a few seconds at best.
This Only Work with original Crop mode 2k files as there is no aliasing and moire to worry about and I would only
use DNG's not Cdng's because there is a small amount of gamma shift up I also made a short video documenting this below.
http://www.youtube.com/watch?v=eCReH-sjr6E
There is so many ways to upscale so always keep your eyes & ears open to new ideas!

Thanks A1ex for the explanation, now I understand what you tring to do
I will do some tests and post them, with my conclusion .

I posted this 8 mouths ago tech changes, you need to focus
On the thing that count like the current state if MLV+Audio

I see a sharpness difference! 1880 is sharper with cleaner edges Then 1856.
1856 is softer image and never be as sharp as 1880, If you look closely at Ted's
Posted image you can really see this.
I Can't believe we are Really talking about this!!
This should be a No Brainer! Max. Resolution, since it take no extra performance out
Of the camera there is no need to limit the the frame size.
I just finish a shoot a few days back with nightly from feb16th
and filmed at 1872x936 continous . MLV is to a point now
That a can trust it not to fail. So anyone that's says that
There is no difference , you are just fooling you self in to thing it's OK.
And when come to Green Srceen/VFX you Need the Sharpes image
You can obtain .   

My Vote for the max pixels 1888 ! I don't have problem cropping in post etc..

Duel ISO just photo for 5d2, the CPU can not keep up.
Try HDR video-Raw it will come close to duel iso but at a cost of half of source frame rate.

No that's Wrong! The HDMI with ML software
Is 4.2.2  8bit 16-235 colorspace .
The image is very close to raw but with picture style applied
I use nijna on 5d2 for backup to ProRes 422Hq or proxy prores with overlays turn off.
I did a short video about this , look on the a.d. 5d2 thread.

MAC or Windows ? i get a error when i try and play MLV.. i get FAILED TO LOAD

Sorry Your right, I had renamed the file for raw to mlv and though it was mlv
My mistake 
But never the less it sync audio nicely and reads all the camera/raw data, I would bet MLV support will come a long
sooner then later .

How are you playing mlv files on scratch.  reddeeecity

With Assimilate Scratch 8.0 Player, Download link from Midphase, works with Wins & Mac
I was testing the Windows version, its got look & feel like SpeedGrade.
It has GPU Cuda Support etc... So MLV/Raw is now being recognizes I think !

Yes there is a little ad running in the lower right hand side of the program, but work very well so far.

[Yes]

Thanks Midphase, downloading and installing now and will test to see how it works with MLV.

Edit: Yes the Assimilateinc Scratch Player Reads & Play MLV+Audio Native in Realtime
And displays All the Metadata( White-point, Black Point, etc..) that MLV has to Offer, So finally now you can use the info 
and for $5.00 you can upgrade to the premium edition from the free download.

Thanks for the tips like always, now the magiclantern-v2.3.NEXT.2014Feb16.5D2212 file is the second Feb 15th download. Do you primarily use the 2:1 1872x936 setting.

Yes 2:1,  I don't like any A.R. less then that as it can be re-framed to full HD
Or As is for Cinematic Super-Scope or also known as Univisium (http://en.wikipedia.org/wiki/Univisium)
So its a win win scenario, And for todays Interview I did with that build, everything when perfectly no problems.
It was to a point where I no longer worried about MLV/Raw Stop recording unexpectedly .
But I did not use any HDMI devices as this was a Run & Gun Style interview, so I don't think I would get Continuous
at 1872x936 with hdmi but I haven't tried that yet.

I should mention that right now the fastest stable MLV+Audio build comes from the nightly build
(magiclantern-v2.3.NEXT.2014Feb16.5D2212)
1872x936 2:1 23.976p + audio, Is continuous with 1000x card on 5d2 fill buffer set to "0"
I will be using this tomorrow on a News-story/interview 

Edit: I do my audio syncing in A.E., but I also record a master track on a Zoom 4Hn
I just use the audio in mlv to sync with master. Resolve is Ok, but ACR plugin is the best out there,
Its just a slower workflow but better result, at least that's what I think anyways.

@Produceurfilm, not sure what you are asking ? Are you using Cdng's or dng's ,
Are you using the After Effect/Premiere Pro work-around or are just ingesting dng's directly
in to Premiere Pro ? Need to know some more information then we can help.

For the 5D Mark 2, Just press the zoom in Button, It's the 3rd(last) button on the upper right hand side has a little blue + sign
Press that once now you are in Crop mode you may see a 5x on the Live view LCD screen.
Now press the delete or trash can button and go back in to the ML Raw/MLV Record Menu,
and now you will have access to Frames sizes up to 2152x1076 2:1 (Max.). (This size is with Oct24th/2013 build from a.d.)
Make sure you have FPS Frame Over Ride enable to Exact 23.976 fps.
If not, in Crop mode it will default back to 30p fps, not matter what frame rate you setup in the Canon menu.
This is the correct procedure for the 5D Mark 2, the video above is for the 5D Mark 3 and differs slightly.

Make sure to use at lest a 1000x CF card for stable raw recording, that's minimum recommended speed for the 5d2