- Apr 5, 2004
- 4,426
- 0
- 76
Is the "Ultra Extreme III" just a label/marketing gimmick from Sandisk or is it really a faster performing card compared to say a Kingston class 6 SDHC?
Correct!Originally posted by: sswingle
I think thats just what they call their class 6 cards.
Originally posted by: bobdole369
Every single card, from every single maker/brand/model, etc performs differently. They are all..... snowflakes.... Seriously - check out this test - granted its mostly CF, but the architecture is the same.
http://www.robgalbraith.com/bi...ulti_page.asp?cid=6007
They vary even by lot number it seems. Anywhere from crawling to lightning fast. Generally speaking - the label won't give you a solid basis for speed.
Originally posted by: Zenmervolt
Originally posted by: bobdole369
Every single card, from every single maker/brand/model, etc performs differently. They are all..... snowflakes.... Seriously - check out this test - granted its mostly CF, but the architecture is the same.
http://www.robgalbraith.com/bi...ulti_page.asp?cid=6007
They vary even by lot number it seems. Anywhere from crawling to lightning fast. Generally speaking - the label won't give you a solid basis for speed.
Note that those lists show a lot of dependence on the camera. For example, if a camera supports the new UDMA CF cards, it will be much faster when using the 300X cards, but if the camera does not support UDMA, then that 300X card isn't really going to buy you much.
In my A100, I cannot tell the difference between a 100X card and my 300X card, but with my A700 there's a huge difference. This has to do with both the processing engine in the camera and the A700's ability to use the newer UDMA CF cards while the A100 doesn't recognise that transfer mode and defaults to the slower PIO mode. In this case, it's not the card that's slower, it's the camera.
If you look at the tables you link to, you'll see that the newer cameras consistently take advantage of the faster card write speeds while older models do not. For example, the best that the old 5D can manage with a SanDisk Extreme IV 4GB is 7.375 mb/sec while the 5D Mk II with the same card hits 29.504 mb/sec. This is much more indicative of the camera's ability than of the card's. The older 5D is using PIO mode, while the Mk II has the ability to take advantage of UDMA which yields much higher speeds for the Mk II.
ZV