update: sorry for getting people confused ;/ the previous test was performed through sd card reader that was plugged into usb port... so when i thought more about it i realized that that is probably the bottle neck, and its not the cards fault. so did another one using express card port and sxs adapter and now transcend class10 reaches ~20,5MB/s average and sandisk extreme 30MB/s reaches 29.5MB/s average. that's more like it!

I have no idea where to get a death chart

There’s a bunch here: http://www.personal-view.com/talks/discussion/2017/importance-of-proper-tests-for-reliable-in-cam-playback-lessons-from-the-field/p1

@balazer The card RawB posted is indeed the non-pro version but its not the HDVideo version I was talking about. RawB's the same as the one touviere7 posted above but the one I'm talking about is this one: http://www.bhphotovideo.com/c/product/828326-REG/SanDisk_SDRX3032GA21_32GB_SDHC_Memory_Card.html

Notice the HDVideo label, like the old 30MB/s version but it is now 45MB/s. I should be getting my 45MB/s card tonight so I'll run a few tests. Which one I will get though is still a mystery :)

It seems like there are possibly 3 different 45MB/s cards.

1. The old Extreme Pro which is now discontinued. This was not so hot.
2. The one RawB/touviere7 posted. Still unknown as to whether it will perform.
3. The one in the BH link above. Again unknown.

The insides of all 3 could be identical but with different labels. It seems SanDisk is releasing the 95MB/s and renaming the old Pro (45MB/s) cards to HDVideo and dropping the slower cards. Previously the Pro line was 45MB/s and HDVideo was 30MB/s so everything is being shuffled along as it were.

Slightly off topic but what are the "recommended settings" to stress a card out with? I plan on seAQuake with v1.0e FW. I'll probably be shooting a screen of random colour noise since I have no idea where to get a death chart or which the "best" death chart is.

Thanks for your test result, touviere7. It's a very useful point of reference to know that the Extreme 45 MB/s card spans with Aquamotion v2 (88 Mbps GOP1). That would suggest it's at least as fast (for our purposes) as the HD Video 30 MB/s cards.

The next most useful things to know would be whether it spans at 146 Mbps GOP1 (Reaquanted, Seaquake), and whether it spans at 100 Mbps GOP3. (I can supply settings to test that. Flow Motion is VBR, and so not a good test subject if you don't know how to induce a certain bit rate.)

This is the benchmark I was speaking about.

http://www.tomshardware.com/reviews/sdxc-sdhc-uhs-i,2940-12.html

I don't know if computer test are useful to understand GH2 compatibility but I see that these Sandisk have a minimum write speed of 800KB. Maybe this could cause occasional write speed errors or spanning errors when GH2 IO buffers get full. From this benchmarks seems that the Kingston perform better on min write speed. Again, who knows if these test are useful in some way...

@redpaw, it's not (only) about what the card can do via your computer. You'll have to, for sure, what it can do in the camera. I've seen far too many "it should work, but it doesn't" I'm not counting on these kind of tests anymore.
@balazer, why would Sandisk make it easy...pff. Forget about my attempt. I'm curious to know whether the 45MB/sec version 'of Rawb' is any good, or we'll have to trade cards with somebody on some market...

@redpaw, thats really interesting that the Extreme HD is showing the same speed as the Transcend class 10. I have been wondering lately, as the majority of my cards are Transcend class 10, why they are able to hold up pretty well using @Driftwood s newest hacks (Rocket and Orion) when some people are saying they have errors using thier HD Extreme cards. If they really are writing at the same speed, that would be why. Still saving up for a 64GB 95mp/s though

How about using HD Tune (can be downloaded here for free http://www.hdtune.com/files/hdtune_255.exe ) to check the real write speeds of the cards? i checked mine and here's what i got - sandisk extreme hd video (32GB) 30MB/s - hdtune: 19.9MB/s - sandisk ultra II (16GB) class 6 - hdtune: 17.6MB/s - transcend class 10 (32GB) - hdtune: 19.8MB/s - transcend class 6 (32GB) - hdtune: 18.5MB/s - transcend class 10 (16GB) - hdtune: 19.9MB/s

not really what i was expecting to see ;/ would be interesting to see what sandisk extreme pro's real speeds are

I’d say this “writespeed” spec isn’t entirely accurate. I believe the numbers you see on the label refer to the maximum read speed. Write speeds will vary from card to card and are usually not indicated. (They may be indicated somewhere on the packaging with the regular “up to” disclaimer.)

@RawB That's the card a few people are reporting issues with. Some people say it works fine but others say it doesn't work so good. The 30MB/s cards are supposedly the current recommended choice.

Don't know if anybody tested this card but it may have spanning issues with the more moddern hack.

Has anyone tried any hacks with a Sandisk HD Video 45MB/s card? This card looks exactly like the 30MB/s card in the first post but instead of 30MB/s its labeled 45MB/s. Its supposed to replace the 30MB/s HD Video according to my supplier. They have both in stock right now and I can choose either but I'm not sure which to go for... I have a feeling it could be the Extreme 45MB/s card that everyone says to avoid with a new "HD Video" label.

It's not exactly expensive so I wouldn't mind taking one for the team but it would be nice to know if anyone else has tried one :)

EDIT: OK, so looking on B+H's site reveals that the 30MB/s HD Video is discontinued and they recommend the 45MB/s HD Video as the replacement. I'm guessing people who want the 30MB/s should buy it sooner rather than later...