Anandtech hade en artikel häromdan,
Discrete HTPC GPU Shootout
Citat:
We have observed that the refresh rate is heavily dependent on the AV components in the setup (a card which provided perfect 23.976 Hz in my setup performed quite differently in another).
Tidigare har de inte haft några problem att få AMDs grafikkort att hanter 23.976 fps, men den utrustning som användes denna gång fungerade det inte, men det gick bättr för nVidia där man kan skapa egna upplösningar.
Citat:
The takeaway from this section is that none of the GPUs can claim to do fully perfect 23.976 Hz refresh rates. With luck, the ATI card in a particular setup may be able to provide the perfect refresh rate. After all, they came very close to the required settings in our testbed. The NVIDIA cards, at default, are probably going to be always off. However, for the advanced users, there are some avenues available to obtain the required display refresh rate. Unfortunately, there is no way I am aware of to feed custom refresh rates in the Catalyst Control Center.
Before I started the review, it was my opinion that AMD is much better at native refresh rates compared to NVIDIA. After putting the various cards through the paces, I am forced to reconsider. AMD may work well for the average HTPC user. For the more demanding ones, it looks like NVIDIA is the winner in this area because of the ability to create custom resolutions.
En sak jag funderat över är var grafikkorten får sin referensklocka ifrån. Finns den på grafikkortet eller är det PCIe-bussen? Ett moderkorts klockfrekvens är inte särskilt stabil. Varierar oftast betydligt mer än vad som krävs för att 23,976 Hz ska hållas inom +- 0,0005 Hz
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