😉 As cdub suggests, you need to use 3rd party sw to allow core & RAM clock mods and 3Dmark is great to verify your limits (but I'd suggest backing off a little more when you find it).
😀 4200-128MB are just as capable of hitting 320/620 as 4200-64MB. 4400=275/550 o/c=300/620, 4600=300/650 o/c=320/720. Doesn't anybody read the other threads? IT COMES DOWN TO THE TYPE OF RAM IMPLIMENTED!
Core on 4200 cards should o/c anywhere from 280 to 320.
4.0ns is standard for ALL 4200 cards and o/c to around 550.
3.6ns is more common on 4200-64 but is also readily found on 4200-128 and o/c to around 620.
😉 You can read the ns rating of your RAM from the RAM chips, 2nd line down last 2 numbers. Fancy HSF designs do VERY little, RAM HS do nothing to enhance o/c. Manu is of little importance, the chipset dictates almost all perf, features and potential.
😀 Any 4200 card is great value for money, even at defaults they beat the GF3TI500 and full ATI Radeon8500, however the 4200-128MB is definitely the better buy, esp long term (6 months+).