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 Radeon HD 4850 2 GB GDDR3 review

 By: Hilbert Hagedoorn | Edited by John A. Johnsen | Published: July 28, 2008  

   

 

Overclocking & Tweaking

As most of you with most videocards know, you can apply a simple series of tricks to boost the overall performance a little. You can do this at two levels, namely tweaking by enabling registry or BIOS hacks, or very simple, tamper with Image Quality. And then there is overclocking, which will give you the best possible results by far.

What do we need?
One of the best tool for overclocking NVIDIA and ATI videocards is our own Rivatuner that you can download here. If you own an ATI or NVIDIA graphics card then the manufacturer actually has very nice built in options for you that can be found in the display driver properties.

Where should we go ?
Overclocking: By increasing the frequency of the videocard's memory and GPU, we can make the videocard increase its calculation clock cycles per second. It sounds hard, but it really can be done in less than a few minutes. I always tend to recommend to novice users and beginners not to increase the frequency any higher then 5% of the core and memory clock. Example: If your card runs at 600 MHz (which is pretty common these days) then I suggest you don't increase the frequency any higher than 30 to 50 MHz.

More advanced users push the frequency often way higher. Usually when your 3D graphics start to show artifacts such as white dots ("snow"), you should back down 10-15 MHz and leave it at that. Usually when you are overclocking too hard, it'll start to show artifacts, empty polygons or it will even freeze. Carefully find that limit and then back down at least 20 MHz from the moment you notice an artifact. Look carefully and observe well. I really wouldn't know why you need to overclock today tested cards anyway, but we'll still show it ;)

All in all... do it at your own risk.

Check this out:

You are looking at Mass Effect, by the way. With the pre-defined settings as discussed earlier.

We were able to push the core frequency towards 700 MHz which was the maximum the Catalyst control center would allow us to push. We need 3rd party software to go further. We are currently working on support for this in Rivatuner. The memory overclocking disappointed, effectively we pushed 2x 30MHz more out of it before we started to observe artifacts.

 As you can see, the result is again a slightly faster performing card. Again; the game you are looking at is Mass effect with maximum in-game quality settings enabled. You can expect to push another 5 maybe 10% additional performance out of the card, completely free.





 

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