my budget allows me for gtx 260, hd 4870 hd 5770 or hd 4890. .. plz tell me which one iz suitable 4 my PC? my current soecifications are : - intel core 2 due E7500 @ 2.96 - 2gb x 1 ddr2 - hard disk 500 gb - DG41RQ mobo. - 600w PSU.
although the 5770 is 128bit, its runs its memory clock faster but that is besides the point. The 4xxx and 5xxx are different series of cards so you cant compare their statistics against one another. Your best tool would be review benchmarks to see comparisons.
The 4890 is faster then the 5770 but not by much. The 5770 is cheaper, offers DX11 (if you have Win 7) and runs cooler. Both are fine cards and you cant go wrong with either one.
how can i overclock 5830........?
it has same procedure as hd 4870, hd 4890 and hd 5770?
i have read during my search on net that AMD has block overclocking on hd 5830 due to some reasons... is it right?
This has been explained to you many times. Yes you can overclock the 5830. You open Catalyst go to the overdrive tab and move the sliders to the right. For more additional help you can always send a private message to me or someone else if you feel that no one is answering your question.