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Seeing all the responses you got in this thread I'd say noone ever heard of Topram cards. I certainly had not heard of this brand until you mentioned it. When I googled for it the only match was on eBay; I could not find any reputable online retailer who carries this card... not a good sign.
There are three well-known 4GB SD card models today: all 150x cards by A-Data, RiData, and Transcend. Actually, the RiData is the latest addition, so very little is known about it. Anyway, this is the card which I would buy, hoping that the 4GB model is as outstanding as the 2GB card. The Transcend 4GB is unimpressive. I have no experience with the A-Data. Judging by posts from other members of this board and another the 4GB A-Data and Transcend cards appear to be similar.
Both the A-Data and Transcend cards work with the x50 family so they must work in the x51, also. I would be very much surprised if the 4GB RiData did not work.
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Transcendental x50v: 4 + 8 GB SD and CF Transcend cards
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