Messages in this thread |  | | | Date | Wed, 17 Apr 2002 13:46:51 -0400 (EDT) | | From | <> | | Subject | Re: IDE/raid performance |
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Well what's your GFX card? Anyone know the specs on a promise UltraDMA 133 or 100 card or the 760MPX chipset? Nick
On Wed, 17 Apr 2002, Baldur Norddahl wrote:
> Quoting nick@snowman.net (nick@snowman.net): > > On Wed, 17 Apr 2002, Baldur Norddahl wrote: > > > Quoting Mike Dresser (mdresser_l@windsormachine.com): > > > > On Wed, 17 Apr 2002, Baldur Norddahl wrote: > > > Motherboard: Tyan Tiger MPX S2466N > > > Chipset: AMD 760MPX > > > CPU: Dual Athlon MP 1800+ 1.53 GHz > > > Two Promise Technology UltraDMA133 TX2 controllers > > > Two Promise Technology UltraDMA100 TX2 controllers > > > Matrox G200 AGP video card. > > > 1 GB registered DDR RAM > > > > Also, with 12 hd's, dual cpu's, etc, what kind of power supply are you > > > > using? > > > It is a 350W powersupply. I wanted something bigger, but couldn't get it for > > > sane prices. I can't rule out that it is overloaded of course. If it is, I > > > haven't seen any other symptoms, the system is rock stable so far. > > > Baldur > > AMD recommends a minimum of 400watts for a dual athlon system > > IIRC. Ignoreing that the startup current on an IBM 5400rpm IDE disk seems > > to be about 25-30watts. Each 1800+ MP puts out 66w of heat, meaning it > > uses more than 66w (I couldn't find the power useage stats) for a total of > > 132 watts, so on boot ignoreing everything but the disks and the chips > > you've got 12x25w (for the disks) + 2x66w (for the procs) or about > > 432watts. This will go down alot after all your disks spin up, but I'm > > amazed your system boots. Morale of this message: Don't be a dipshit and > > put 12 IDE disks on a single power supply. > > Nick > > > > I checked and it is actually a 400W powersupply. Sorry about that. > > Actually the power usage for the 80 GB western digital disks are: > > Spinup(peak) 17.0W > Read/Write 8.0W > Seek 14.0W > > And for the 160 GB maxtor disks: > > Spinup(peak) 23.7W > Read/Write 4.8W > Seek 5.2W > > This adds up to 8*17.0+4*23.7 = 231W spinup and 8*14.0+4*5.2 = 132W during > seek. > > The Athlon MP 1800+ has the following stats: > > Voltage: 1.75V > Maximum thermal power: 66.0W > Maximum Icc 37.7A > Typical thermal power: 58.9W > Typical Icc 33.7A > > So the CPU maximum uses Vcc*Icc = 66.0W (wow they didn't lie about the > thermal power). > > It is not likely that both CPUs are burning 66W during the inital phases of > boot where the disk do their spinup. Even then you might also be able to > draw more current out of the powersupply than its rating for a short while. > > For this discussion it is more interresting if it is enough during normal > operations. Worst case we got 132W for the disks and 2*66W for the CPUs, > which leaves 400W - 132 - 2*66 = 136WW for the motherboard, gfx, 4 promise > controllers and the system disk. > > The recommended minimum powersupply for this motherboard is 300W. > > Baldur >
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