Please make sure you have a very well ventilated PC. Yet you need to be aware of the fact that the cards require a constant supply of air-flow in order to keep them from heating up too much.
In fact a GPU can reach 120 Degrees C before the fuses blow. For the GPU itself, this heat level is not an issue. The 4870 cards have very little room for proper air-flow, while the air intake is located on the side.īear it in mind. Two or three next to each other requires you to have a very properly cooled down chassis as there is very little space in-between the cards. The positive thing about the dual-slot 4870 is that heat is dumped outside the PC. Airflow to the cooler is pretty good, though things change when you add a second or even third card as the cards are stacked quite close together and are dumping air inside your case. The positive fact about the 4850 is that it is a single slot cooler. The problem with the 4850 is that this heat will be dumped inside your PC. 80-90 degrees C temperatures for these GPUs are pretty normal. Typically both the Radeon HD 4850 & 4870 will get very hot. So with 3-way 4870 CrossfireX that number would be 620-650 Watts.
The monitoring device is reporting a maximum system wattage peak at 480 Watts with 2-way 4870 Crossfire. Our test system contains a Core 2 Duo E8400 3.0 GHz (FSB 1333), the ASUS P5E3 DeLUXE mainboard, stock cooling on the CPU, DVD-rom and a WD Raptor drive. Bear in mind that you are not looking at the power consumption of the graphics card, but the consumption of the entire PC. After we have run all our tests and benchmarks we look at the recorded maximum peak and that's the bulls-eye you need to observe as the power peak is extremely important. The methodology is simple: We have a device constantly monitoring the power draw from the PC. Looking at it from a performance versus wattage point of view. We'll now show you a bunch of tests we have done on overall power consumption of the PC. On average we expect a 150 Watt power draw during gaming, per card. Typically this number is lower as your GPU in a lot of situation will not reach that TPD (wattage peak). Example each added 4870 card can consume up-to 175 Watts per card when 100% stressed. Though Crossfire is real fun and a very fast way to quickly get more performance, it also effectively adds more 'load' on your power bill.
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