Originally Posted by spearman914
The reason a 4830 clocks well is because AMD factory underclocks it from the 4850 speeds (but less shaders) . LOL, that's why u can easily achieve speeds like 800MHZ
If that were true then the majority of HD4850's would also reach 800MHz, which isn't true.
ATI doesn't exactly underclock anything, but rather the chips used for HD4830s are just lower binned chips from HD4850/70s that don't operate at the necessary speeds or with all the core hardware enabled.
As I said before, the HD4830 overclocks so well because the core is running with two SIMDs disabled. Less shaders and texture units to worry about means lower heat output and lower power requirements. Add to that, most current HD4830's use PCBs and power circuitry from HD4850 cards, which usually enhances the card's overclockability.
Revised versions of HD4830s will come with more compact PCBs with reduced/less complex power circuitry, to save costs. This will also most likely decrease the overclocks you can achieve.
Anyways......... No point in mincing words. The HD4830 is a great card for the price, and with it's current excellent overclockability makes it tough to beat.