Got the aforementioned MSI FX5700 Ultra today.
The card was in pretty tragic condition due to previous unsuccessful repair attempts and shipping in a regular letter envelope...
Two VRM controllers had been (badly) soldered and there were several SMD components missing. One cap and the 3.3/5V (?) Mosfet had been replaced.
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I resoldered everything with hot air and flux, borrowed a few parts from a dead 5950U. Voltages to my surprise all present but still no picture.
With the monitor on a second card, I could run Nvidia Mats/Mods though. 5700U still had memory errors.
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Another round of hot air and flux later, the card works perfectly again.
I was thinking about adding 4 more ram chips on the back side to make it a 256MB card. For now, I'm happy with it though. Here it is in restored condition:
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