AdamWill said: smooth: it's configured right. Trust me on this. I maintain the graphics card driver detection tables, so I know. :) I spend several hours each release cycle with my head stuck in various obscure bits of NVIDIA documentation and driver sources to get it right. We have better graphics card detection than anyone else, actually.
The point is, I don't bother having a differently named entry for *every single video card ever*. Life's too short and it'd be a pain to maintain. In practice, many different cards share the same driver settings, so I group cards together.
For NVIDIA cards, all cards from the GeForce 6100 onwards use the exact same driver settings. They use the 177.xx proprietary driver, or the nv free driver. There's no need for every one of these cards to have its own separate named entry in the list, because they all use the exact same settings. So there's just a big group labelled 'GeForce 6100 and later' which covers all these cards. That's what your card is detected as: it's not detected as an actual 'GeForce 6100', just as an NVIDIA card that's a GeForce 6100 or newer.
I don't know why (or what) is showing your card as having more memory than it actually has, but it's not anything Mandriva-specific. Mandriva's tools do not care how much memory your graphics card has, they never bother even trying to find out. All they care about is the model of the card. If you say exactly what tool is getting it wrong I can take a look, but I don't think it will be affecting things at all.
edit: oh, I see now it's the NVIDIA control panel. I don't know why it would think that, but that's down to NVIDIA, not us. We don't do anything odd to it.
For backports, see: http://wiki.mandriva.com/en/Docs/Basic_tasks/Installing_and_removing_software#Advanced_use:_Backports_and_candidate_updates
the only thing that is really keeping from mandriva right now is i can't get my lexmark x1270 to work at all. i can get it to work very easily in ubuntu with 2 deb installs. :confused: