Need help overclocking Sapphire HD 4870

[phroneo]

Greetings,

I'm giving consideration to purchasing either an EVGA GeForce GTS 250 with 512 MB 256-bit GDDR3 Ram or an EVGA GeForce 9800 GT 1GB 256-bit GDDR3 Ram. I'm not a gamer but I do a lot of graphic design work so either card should be OK for my needs. Whichever card I purchase to run my ViewSonic VP2130b Pro monitor, I want to replace the on-board cooling fan. I've done my best to make a super quite system so I don't want to ruin my quiet with a screeching video fan.

I have two questions:

1. Which card do you think is the better card for a graphics design application, and
2. Does anyone have a recommendation as to what 'silent' aftermarket fan I could purchase for either of these cards? (This may be the deciding factor for the card.)

I now have a Zalman VF700-CU fan on an EVGA NVidia GeForce 7900GS KO that runs at a silent 800 rpm. It's a great fan that keeps my card a steady temperatures. However, it's not spec'ed to fit either card I want to purchase.

Thanks in advance for your help.

 

[bigmidgeman]

Just bought a Sapphire HD 4870 1GB video card and would like to overclock it. Is there a forum on this already that I can look at or any suggestions and help I can get?

 

[japps2]

there is an overclocking panel in CCC...use that to overclock and to test. If you start to get flickering (most common) or artifacts then back off. Although I read a review that compared the factory overclocks to non-overclocked reference cards and there wasn't much difference.

 

[Euphoria_MK]

Or you can get a Accelero Twin Turbo cooler and get over 800MHz speed at very low noise and temperatures.