The 2 gb cards that are not SDHC are on a totally different rating system. See below:
http://en.wikipedia.org/wiki/Secure_Digital_card
Speeds
There are different speed grades available which are measured with the same system as
CD-ROMs, in multiples of 150
kB/s (1x = 150 kB/s). Basic cards transfer data up to six times (6x) the data rate of the standard CD-ROM speed (900 kB/s vs. 150 kB/s). High-speed cards are made with higher data transfer rates like 66x (10
MB/s), and high-end cards have speeds of 150x or higher. Note that maximum
read speed and maximum
write speed may be
different, with maximum write speed typically
lower than maximum read speed. Some
digital cameras require high-speed cards (write speed) to record video smoothly or capture multiple still photographs in rapid succession.
As of December 2005, most devices comply to the SD card specification 1.01, maximum speed of 66x. Higher speeds of up to 133x are defined by specification 1.1.
I think your card is at 1.1 spec, which should be plenty fast enough.