I have printed borderless A4's (almost 12") from files even smaller than this with brilliant results. I do not think you will see much of a difference until you get up to around A3 size. I know 300 dpi is quoted as 'photo quality' but in practice you can get good prints from 200 dpi. I recently had a 3456 px wide image printed by photobox at 16" x 12" (216 dpi) and it came out great.
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