memory upgrade for 4gb

Hi,

Looking now for memory upgrade...

My Hardware:

Hardware Overview:

Model Name: iMac

Model Identifier: iMac7,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2.4 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 4 MB

Memory: 2 GB

Bus Speed: 800 MHz

Boot ROM Version: IM71.007A.B03

can I use a memory 800 mhz?

???

just checked Apple store :

iMac (Anodized Aluminum) 2nd Generation Spring 2008

Anodized Aluminum Spring 2008, 24-inch with 2.4+ (or better) Processor.

No memory currently available for that model.

Thanks