Jpeg export quality differing from separate macs

I have noticed a discrepancy in the quality of jpeg images exported from iPhoto 9 on different Mac models...
I recently bought an estarling wireless photo frame. With it you can email the pictures to a gmail account and the frame will download them. As I was uploading photos from different Macs I noticed a difference in quality of the images on the frame. To test this I followed the exact same procedure from four different Mac models all with iPhoto 9 and 10.6.4: MacBook Pro Core 2 Duo, iMac Core Duo (older mac), MacBook Core 2 Duo, and a MacMini Core 2 Duo. The procedure I followed was to import photos from my Camera to an iPhoto Library. Crop them at a 5x3 aspect ratio. Choose a photo and File > Export. Choose JPEG, Maximum Quality, Custom Size dimension of 800px and export them to the desktop. I then send them to the frame. Comparing identical photos, what I noticed is that the photos from the MacBook Pro and the MacMini are very noticeably more crisp and clean looking on the frame, while the photos from the MacBook and iMac are much more pixelated.
Has anyone else noticed anything similar? Could this be related to hardware? Please let me know if I can provide any further information that would be helpful. Thanks.

I would first compare them after export and before emailing, to remove the possibility that the discrepancy is introduced by the uploading/downloading process.
Regards
TD

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