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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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John Lewis wrote:
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 Keep in mind that the reviewer samples are only an A1 revision engineering reference board, straight out of the bin. It's likely that come production time, each manufacturer will choose things such as a cooler, the mosfets, caps, vregs, etc. So by the time you get your hands on one (a GF6-6800U), most card manufacturers will likely go with a _strict_ reference design (including the HSF and ramsinks), but you might find some that just barely fit in a single slot with a different cooler. Also, the voltage requirements right now are a "clean 12v", so depending on what components are certified by NVidia, some manufacturers /JUST MIGHT/ be able to get away with a single plug from a good PSU (like a high rated 350w). NVidia's Q.C. program they've inacted since the FX series launch is likely going to be the limiting factor in this. What I'm really excited about is the next card revision. In the same way the NV35 completed the promise of the NV30, The NV45 (or whatever core revision gets stuck on the PCB in 6 mo.'s), will likely be a much more efficient and slimmed fighter. Most likely even better memory bandwidth, some tweaked RGMSAA modes, probably a few Doom III tricks , and hopefully a much more efficient power usage. As for now, it looks like brute force is doing pretty well. |
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On Wed, 14 Apr 2004 15:59:38 -0500, duralisis
wrote: Keep in mind that the reviewer samples are only an A1 revision engineering reference board, straight out of the bin. It's likely that come production time, each manufacturer will choose things such as a cooler, the mosfets, caps, vregs, etc. The 110 watts is nVidia's max. spec.....according to the reviews. So by the time you get your hands on one (a GF6-6800U), most card manufacturers will likely go with a _strict_ reference design (including the HSF and ramsinks), but you might find some that just barely fit in a single slot with a different cooler. Also, the voltage requirements right now are a "clean 12v", so depending on what components are certified by NVidia, some manufacturers /JUST MIGHT/ be able to get away with a single plug from a good PSU (like a high rated 350w). NVidia's Q.C. program they've inacted since the FX series launch is likely going to be the limiting factor in this. I agree. But I will go with the 2-plug version if it is available. The lower the PS impedance at the board, the less noisy the power on the board. What I'm really excited about is the next card revision. In the same way the NV35 completed the promise of the NV30, The NV45 (or whatever core revision gets stuck on the PCB in 6 mo.'s), will likely be a much more efficient and slimmed fighter. Not likely for quite a while. Manipulation in the current 0.13u process will have very little power-savings without cutting functionality. And the masking cost is horrendous. Probably at least $1 million for a chip this size, assuming first-pass no errors... I would expect the next real iteration to be either a .09u ..065u shrink. IBM is working with AMD on .065u. And that sure won't happen in six months. The NV30 to NV35 interation was a significant DESIGN improvement on the SAME process. The design of the NV40 seems near-perfect for the current graphics state-of-the-art. Only benefit would be a mask-shrink, which would potentially improve yield (assuming a stable process) and significantly raise the number of die per wafer - thus doubly reducing production costs. John Lewis Most likely even better memory bandwidth, some tweaked RGMSAA modes, probably a few Doom III tricks , and hopefully a much more efficient power usage. As for now, it looks like brute force is doing pretty well. |
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Blow it out the back of the case with a case fan. But I don't blame you for
not thinking of the obvious. There are a lot of novices on this NG. DaveL wrote in message ... Plus were are you going to put all the HEAT that this Crap card generate, as it blows into the Case.. Bad Bad Move.. |
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On 15 Apr 2004 02:26:53 -0700, (Nada) wrote:
(John Lewis) wrote: On Thu, 15 Apr 2004 15:12:17 +1200, wrote: Plus were are you going to put all the HEAT that this Crap card generate, as it blows into the Case.. Please read my original posting again. According to Tom's hardware the 5950/9800XT are about 90 watts max. for the board. According to nVidia, 110 watts max for the 6800 board. The NV40 chip dissipates about 25 watts more than NV35/R350, the DDR3 memory a little less than DDR1 ( 256Mbyte). Also, according to the Xbit lab review, the 6800 fan never got to full speed in their test setup. Anyway, you only need to get rid of 25 watts more heat. The power supply requirement comes from the need for a very low power-line impedance at the card, combined with the fact that there is a wimpy 12v supply on many sub-400watt power-supplies. Remember that the fastest CPUs consume about 8 amps already from the 12volt supply. John, you wouldn't happen to have a link to a Intel Pentium IV Prescot power consumption test sites? I heard those models produce more watts than HAL2000. This is going to create mass hysteria with upgrading the power supplies again. Yes, indeed and it should be a permanent bookmark for anybody building Intel-based PCs or trying to find a particular mask rev of a processor. http://processorfinder.intel.com/scripts/default.asp Pick your processor. Click on the appropriate SL code and bingo... all the important shortform infomation on mask version, wattage, max operating core temp etc. For example, note that the P4EE is spec'd for a max core temperature of 64 degrees C only. Doesn't mean that it will stop working at 65, but it might slow down a little.... Prescott 3.4 is 103 watts max Northwood 3.4 is 89 watts max. For reference the whole nVidia 6800Ultra board has a maximum dissipation of only 110 watts Compared to the block heatsinks of the processors, the nVidia reference thermal solution is huge (and apparently very quiet ). I'll take huge and quiet any day... BTW, the weight of the 6800Ultra is no greater than the 5950U, since the heatsinking is all aluminum. I suspect that some of the vendors of Nvidia cards (MSI and Leadtek come to mind ) will replace the aluminum with copper to get the Ultra height down. Beware of the weight of a copper thermal solution.... No matter what solution is adopted, the PCI space next to the 6800 or 680 Ultra should be always left completely free for adequate ventilation, unless the alternate solution vents directly through the rear -- and with the 2 large DVI connectors that will be very difficult to do effectively in a 1-slot space. John Lewis |
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