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I got these yellow dahlia tubers from a flower farmer who were just giving away her extras. She said this variety produced so prolifically and performed so well in storage that she had more than she really needed. Unfortunately she lost the tag for them so she doesn't know what they're called. I did a little online research and I think it might be "American Sun" since the blooms are about 6" across but I can't be certain. Yellow Gem is a pompon flower variety so I think it's different...though there seems to be consensus that the plain yellow dahlias are the best ones to eat.

I probably should have searched first. I have now and it is significantly different to yours, but I rather like the pompom shape. It would have been nice to have a variety of colours, but I favour flavour over that!