Common problem with nVida Cards.
this happens to me as well and i don't use anything nvidia. i have a hd 2900xt (w\ the latest drivers). this only started to happen within the last 4 patches. at least with me it did, but at first it was only one part.. then 2 or 3... then it got much worse with the latest DA patchs, specifically (1.70c[a].001 and 1.70c[b].001), where my ships were looking much like the ones in the images posted above.
i did a complete reinstall (DL & DA) lastnight and other than loosing one custom ship... things seem to be working fine.
Disabling Mixed Vertex Processing Mode in the Video Options screen should solve your problem.
thanx, i'll try this if it happens again.