CF cards are marketed on the same speed scale as SD/MMC cards (as are MS, SMC, xD, TF, rs-MMC, mini-SD, etc...).  Remember, however, that the X rating is usually a burst read-rate, and won't tell you how the card performs in a digital camera.  Check the sustained write performance in the card specs to see which card is really faster for your digital SLR.

Gerard Snitselaar wrote:
> On Sun, 2006-01-22 at 02:33 -0500, FoulDragon@aol.com wrote:
> 
> 
>>The "80x" is the data rate in CD-ROM drive speed, and 1x = 150kbps, so 
>>80x=12000kbps.
>>
>>
> 
> 
> Does that hold true for the 40x , 100x that you see on CF cards?
> I am looking at upgrading the CF card for my Digital Rebel to a 2GB
> from the lowly 256MB one I have right now. I noticed the 40x and
> 100x at Fry's tonight.
> 
> 
> 
> 
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