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[Calen]

My Ti4200 is managing

core: 300MHz
mem: 563MHz:

Impressive, the ti4200 was always a great little card, mine served me well for a couple years.

Which is about a Ti4600 isn't it?

Indeed. you core i think is now at 4600 speeds but the memory is alittle slower, 650 on the Ti4600 IIRC.

I had good Fortune to get myself a FX5900 (not XT) new for 125 UKP, as 2 weeks later they where next to impossible to purchase new.
NVidia done some shifty marketing, brought out the inferior XT version to compete with the XT version of the rad cards.

Example: Nvidia released the 5900 XT (5900 replacement) which had the same core as the 5900 but had slower memory, 2.8ns rather than the better 2.2ns from the older 5900.
So they shipped with a memory clock speeds of around 700/750 mhz, 5900 had around 800mhz mem speed but was easily overclockable to 5900 Ultra speeds and can even be pushed to match the very expensive FX 5950 because it had the faster memory to do so. Mine currently is running at 450 core instead of 400, 930 mem instead of 800. More can be pushed out of this card but i'm playing safe in this current heatwave :-)