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Your links didn't work for me but I believe the cheaper card is the new version (G4) and personally would buy that one. The speeds listed on the BH site are slightly faster (newer firmware) for the cheaper card. Amazing how much cheaper they are.
I've fixed the links - they should work now.
if they have stock, it might be based on what they paid for them
I suspect it's based on their cost - but also keep in mind that some of these cards are sold in very large quantities. They might have a minimum order size of around 100 or more. The G4 version is brand new and was not readily available until the past month or so.
Do you know Eric if the actual "flash memory" (or whatever it is called) for the Delkin black G4 cards is different than the prior version of these cards? Or if they run at the same temperature?
I don't know the specifics, but my understanding is the Delkin Black CFExpress card was an upgrade from the prior version. I believe the memory and firmware were both updated. Temperature should not be an issue, and if it is a problem, it's probably from something other than the card. The Delkin Black as far as I know is the best card available based on in-camera testing. The others in the same range are ProGrade Cobalt and Lexar Diamond.
Speaking for myself, when I travel, I am tired, suffering time changes, etc and don't want to risk messing things up. So although I will periodically back up, would prefer just having all my photos (written to the Delkin black 512GB card in slot 1) and video (written to my 2TB Delkin Power card in slot 2) still in my camera (a Z9). When I got home from my last trip, I had about 2TB of photos and video! So all still on the cards plus backed up on an external hard drive. I know I shoot too much.
There are a couple of reasons for a large card.
Shooting all day events, or on trips having larger cards means I can worry less about backing everything up constantly and running out of card space.
Also keep in mind that several of the cards listed are no longer available or the specs have changed with new versions. The Delkin Power cards are now mainly G4 versions. The G4 Delkin Power cards are relatively slow but inexpensive up to 512GB, but at 650 GB and larger, they are almost the speed of the Delkin Black and a bit cheaper.
I don't plan to repeat the tests I did. Cards were "full" formatted before each test. I did not do a second reformatting. This was meant to be a comparison only. I do not double format between shoots so I followed my standard procedure. I was on firmware 4.01. Nothing in the release notes indicates that write speeds would be any different after firmware 4.10 installed. In the real world, I reach a full buffer maybe 2 or 3 times in a year using the faster cards, so it is really a non-issue for me. The slower cards are most often in a Z6ii doing portrait work where write speed has no impact.
My questions about the Delkin Black G4's spec, was because I ordered from an on-line promotion from a reputable official Nikon dealer, a Delkin Black 325GB card specifically mentioned as regularly $469.99 on sale for $279.99 or a 40% special sale. Seemed fair, as B&H sometimes as such deals. Hence I was expecting a Black card as specifically described by the sale.
Comparison between what was advertised, a Delkin Black officially labelled "DCFXBBLK325", and what I received, Delkin Black G4 officially labelled "DCFXBB325". So TWO spec sheets with normalized / comparable data.
Yes, that maybe true, but it is not a spec sheet, duly released by the fabricant. Furthermore, what you mention is not normalized. One is "min sustained", the other is just "minimum". These need to be defined. It's a shell game. What are the specs used for each.
Min Sustained Write Speed: G4 1450 MB/s
