Originally posted by: Sentry11
A silly question really, but I know they are sort of opposite number to each other. So in terms of performance, they might be the same or close to each other. But what about heat dissipation? Which one runs hotter?
Also I read from a few other forums that people are having run time problems, I mean the 4870. Could anybody give me some pointers?
A few things here, because the answer is not so simple. Under idle conditions, the nVidia card will require less power and will thus dump less heat into your room, office, home, etc... However, under load these two as very similar with the Radeon 4870 slightly being more efficient. However, this can vary as each individual card can vary in power consumption.
Now, keep in mind that power consumption is directly related to heat output. So, if ATI's card and nVidia's card had the same power consumption and they both had the same exact heatsink and fan size and speed and were in the same ambient temperature, they would both be indenticle in silicon temperature. However, we know that they each have their own heatsinks, and they each design their own sized fan and fan speed settings are determined by the parters of nVidia and ATI. So heat can be very misleading.
Just always remember that the card that consumes more power is the card that will output more heat, and thus need a better heatsink, fan or higher speed setting for the fan. Any of those combinations.
Some people have used Riva Tuner, or edited the BIOS directly to increase their fan speeds to get better heat dissipation. Of course, the side effect of such a thing: Noise.
Also, the idle power of the nVidia series seem to be a bit misleading. Don't get me wrong, it IS accurate, but the GT200 series downclock themselves when not running any intensive 3D Application. This is why their idle power consumption is lower than the 48XX series. However, you can also use Riva Tuna to set profiles for the AMD card to do the same thing. This then allows the 48XX series of cards to idle similarly to GT200 series.
Flame wars are started by recomending video cards and the honest truth is that both of these video cards are neck and neck. Some had advantages in some areas that others do not... Just have to make an informed decision about your purchase.