'Date transfer rate 2x' would suggest you don't need to disable 4xAGP as your mobo's max is 2xAGP, you may need to 'DISABLE 2xAGP' or toggle 'AGP transfer Rate: 1x/2x'. TNT2 M64 is slower than the original TNT2 which is about on par with a GF2MX200 and RadeonVE. Well a Celeron 600mhz will give roughly PIII 500mhz perf, so GF2TI/Radeon7500 would be a decent match for your CPU and a whole lot faster than your current TNT2 M64. Anything faster than GF2TI or Radeon7500 would simply be wasted as your CPU isn't fast enough to give the modern gfx cards (like GF4TI4200) the data and bandwidth they need. You could consider a PCI gfx card, any GF2, GF4 or Radeon would give you much better perf, see what prices are like near you, although I am very confident a Rad7500 would happily work at 2xAGP and 3.3v.
If you find, download and run SiSoft Sandra then this will tell you many more details about your system, esp important is your FSB (Front Side Bus) speed (either 66mhz or 100mhz) and your RAM type (current speed and rating, eg 100mhz rated PC133). If your RAM is PC100 or PC133 (and not PC66) then you will be able to upgrade muchmore cheaply to a faster CPU and mobo. I assume you have around $150 (US) to spend as this is what a GF4TI4200 costs. You would be well advised to upgrade your CPU, mobo ... possibly RAM and PSU too. Of course there would be no use in reusing your current TNT2 M64 as that's already underpowered even for your Celeron 600mhz.
Based upon US prices from www.pricewatch.com I would rec the following components:
Duron1.2ghz $43 (effectively DuronXP1400+ before any o/c)
HSF certified to Duron1.3ghz (or better yet AthlonXP1800+ish) $10
SiS735 $54 (sports 2xPC100/133 AND 2xDDR slots for future upgrades)
GF3TI200 or Radeon8500/LE $85
This would total $192 but would blow your current system away. You should get away with your current PSU and case (ventilation and airflow shouldn't restrict). If you needed a new case and PSU you should find $50 would cover it for a basic well ventilated case with case fan mounts and cheap 400W PSU (350W will do). You could buy another type of mobo, just one which could reuse your existing PC100/133 while ideally still allowing DDR, 133/266FSB and AthlonXP CPUs as future upgrades, often VIA KT266 mobos can offer this too. 256MB DDR-PC2100 is $49 and an AthlonXP1800+ is $78, an AthlonXP CPU would need either PC133 or DDR-PC2100 and would need a good case and PSU.
Another option is:
Duron1.2ghz $43 (effectively DuronXP1400+ before any o/c)
HSF certified to Duron1.3ghz (or better yet AthlonXP1800+ish) $10
nForce 220D $82
256MB DDR-PC2100 $49
This would total $184 and would give you excellent Dolby 5.1 surround soundcard, LAN and an onboard GF2MX. This is very cost effective considering you are getting some great onboard components with the nForce, but since you have a SB Live you wouldn't need the onboard sound (although the onboard sound is easily as good as a SB Live). The GF2MX gfx from the mobo are decent, much better than your TNT2 M64 and would suffice until you could afford a better gfx card, pref GF3TI200 or Rad8500/LE if you can't afford the GF4TI4200.
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