I Have the H 16 gig, and a 16 gig CF card at 60/mg. I have not seen where these have slowed down the D4 any, for the CF card as well. So, I would not guess the N will be slow in the camera. I don't think your going to have issues with how fast it works in the D4, as the D4 has a large buffer. Unless your shooting 100 to 200 images raw uncompressed and your shooting racing cars going 200mph. And then, still.
At 16 gig and 14 bit raw files, I can get around 500 images on either card. I went to an event where I was going to shoot a lot of head shots. And my style is not to just shoot 1 at a time. I will pose, shoot 5 or 6 while I move and give some directions, then repose. I had about 3 minutes to work with each. I shot about 10 to 20 for each gal, about 1 shot a second. I ended up at right about 500 images. I thought I was going to use both cards, but didn't.
Now, this is where I see the difference, on the computer. The XQD can unload the 500 images faster than the CF card. But, if you don't have the newer USB3 on your computer, not sure your going to see that much speed difference between the N and H. I have connected the XQD reader to one of my USB2, and it is slower, but a bit faster than CF. I also just got a BAS [big a--] computer, with 3TB of internal storage. So, a lot is going to depend on your computer.
Why did I get the H over the N, they didn't have the N in stock at the time. I really don't think your going to loss anything by getting the N card now, and then getting something better later. I noticed the prices went up when Nikon announced the D4s. there is now S series and Lexar makes them now.
H is not 4k compatable, this is vidieo related.
H & N is about 125/mb read write.
N & S are 4k comparable, again video.
S is about 180/mb read/write.
B&H has that N32 at 99.98$, so shop around.
This is the card reader I got; http://www.amazon.co...xqd memory card
Edited by Dennis, 17 April 2014 - 01:32 PM.
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Nikon D4, D200, Fm2, FM, Mamiya RB67.