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NVidia 6800 Ultra power requirements
Nvidia 6800 Ultra: 110 watts maximum
Power Supply:- 480 watts minimum !!! Preferably 4 "disk-drive" cables available from power-supply. Two must be available EXCLUSIVELY for the 6800 Ultra. ( minor exception --- auxiliary fans are allowed to co-use these cable feeds ) Power-supplies with only 3 cables will need some $2 splitters on the third cable for the various disk drives --- not a real problem, since their power consumption is very low. Also, from the Tom's Hardware Guide review :- ---------------------------------------------------------------------------------------- ".................................. We can also extrapolate the power requirements of the remaining cards ( FX5950, Ati 9800XT ) from these numbers. Assuming that NVIDIA's quoted maximum power draw of 110 Watts for the 6800 Ultra is correct. Let's also assume that we reached that worst-case scenario during our tests. That would mean that the Radeon 9800XT has a maximum power requirement of about 91,5 Watts, while the FX 5950 needs 93,5 Watts" ----------------------------------------------------------- ..... ever wondered why your 5950 and 9800 got so hot..... ? About the same as the P4 3.4GHz CPU. However, the heat is spread over the video board, since the above power-consumption includes that of memory. My guess at the 5950/9800XT GPUs is around 70 watts... Since DDR3 memory takes less power than DDR1 and assuming 256meg will be the 6800Ultra default, , the actual power in the NV40 (16-pipe ) is probably around 95 watts, around 25-watts more than the existing GPUs, so the nice big 2-slot cooler on 6800 Ultra should be more than adequate for the new GPU. BTW, the 6800 non-Ultra (12-pipe) will have only 1 power-connector (!) and a single-slot cooler, so those thinking of cheesily upgrading the 6800 non-Ultra 12-pipe to the 16-pipe by a BIOS/hardware hack will probably have to think again. Either the NV40 12-pipe is a totally different mask or more likely the power supply to the core is divided into groups of 4 pipes and that the 12-pipe will be parts that fail (silicon-blemishes) to get all 16-pipes working to spec, with the failures concentrated in one group, and the power then either hardware-enabled external to the NV40 or bonded internally to avoid that group. If externally hardware-enabled, any attempt to modify the power-enabling arrangement for the 12-pipe NV40 to enable all 16 pipes is highly likely to burn out the power-regulators or sag the voltage too much, since regulator power-sharing is obviously not available on the single-connector board.. John Lewis |
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