Ummm not quite... the native resolution for most (most is used lightly in this case, there are some 2d games that go a little higher from what I've heard) nintendo 64 games is 320x240 (the resolution of a VHS tape) the expansion pack *can* increase the resolution for games that support it but I don't think it would be any higher than 352x480 (the highest possible resolution that a RCA or S-Video cable can provide, it's also the broadcasting resolution for most TV Stations). The supposed resolution for a tv is 640x480, but seeing how there is no way to get a signal with that resolution (unless you have a high definition tv, but then technically it would be stretched to 1024x768, but the n64 was designed before RGB cables really hit the market so that whole theory fails as you cannot connect a RGB cable to a n64)...
I don't see the point of getting an SVGA adapter (SVGA is actually 800x600 by the way... VGA is 640x480) that just captures the 352x480 (which is actually a stretched 320x240) signal and stretches it to fit onto a computer screen (which doesn't have the natural "bluring" a tv does, that's why dvd's always look better on a TV rather than a monitor, you can't see the compression blocks as easily on a tv). Plus there is the fact that unless the converter does some type of color conversion the image will appear distorted (different Red Green and Blue values between the two for things like black and white).