Am 24.09.2015 um 18:12 schrieb Alan McKinnon: > On 24/09/2015 16:00, Volker Armin Hemmann wrote: >> Am 17.09.2015 um 05:38 schrieb james: >>> Philip Webb <purslow <at> ca.inter.net> writes: >>> >>> >>>> 150914 CPU : AMD X8 FX8370E 8-core 4,3 GHz 16 MB 32 nm 95 W >>> I have 3) FX8350. Outstanding performance for the cost. Love them all. >>> >>> >>> >>>> 150914 Mobo : Gigabyte GA-970A-UD3P 970+SB950 DDR3 2000 : 119.99 >>>> 2x PCI-Express x16 GLAN 6xSATA 6.0 Gb/s 4xUSB 3.0 14xUSB 2.0 >>> I have (3) of the Ggiabyte 990A-UD3P mobos:: I love mine >>> >>> Very extensive wiring needs, plus you have to match the video card >>> power needs to the power supply. None of my older PS would fit the bill. >>> Also, there has been a quiet revolution in power supply. The efficiency >>> of the switching circuits will save you more money in the long run >>> and those electronics will deliver the cleanest power to your other >>> electronics. PS have ratings so look at the efficiency and oversizing a bit >>> from calculated loads is never a bad idea. >>> I would recommend to 'not go cheap' on the PS. Becuase >>> 4+ GHz can create some very localized heats, I put a 'water cooler' >>> on the chip that has hoses running to a radiaor bolted on the the main rear >>> fan of the Case. A wise investment at 4.3GHz. Air cooled CPUs are suspect >>> at those frequencies, particular if you like to compile lots of code >>> or stress the all the cores at the same time. >>> >>> >>> >>> >>>> 150914 Memory : Kingston HyperX Fury 8 GB DDR3 1866 MHz CL10 : 68.99 >>> I always max ram in lieu of SSD. I know you have a budget but max >>> ram is the single biggest item on performance and most things are >>> memory constrained on processing, ymmv. >>> >>> Every thing else look for bargains. Newegg is a great place to vett prices. >>> >>> Make sure your case has a big and quite fan to draw air across the HD. Most >>> new cases do. In all you buy, check the dB (sound level) especially if >>> you want a quite rig to sit near you. Make sure the UPS you have is >>> adequate and tested. Put a large light on the UPS. Yank the power cord >>> of the UPS to the wall and you should not see a flicker nor deeming >>> of the light of the bulb; thats a good UPS. UPS protects ALL your >>> electronics, but never printers as their power draw surges can easily >>> fry a smaller UPS. >>> >>> hth, >>> James >>> >>> >>> >>> >>> >> I have a 125w CPU and a R7 370 plus a shitload of HDDs and all those are >> quite happily fed by a 450W PSU. A pretty old 450W BeQuiet PSU. >> >> Go figure. >> >> What does my 600VA UPS says about this? >> 27% load at the moment. > > That's all as expected. There's also this thing we called headroom: > > As I said in an earlier mail, and got an earful for my trouble, a 125W > CPU does not draw 125W all the time and your 450W psu does not deliver > 450W all the time. Your PSU is delivering about 125W or so average which > is what I expect from that hardware. > > But computers are not nice well behaved LED bulbs that draw constant > power that never varies. The CPU ramps up to full S1 state, hard drives > spin up and that causes power draw to surge and spike. How much does it > need? Hard to give a definite answer but easily 5 or 6 times the > average, especially spinning up drives that spun down. You can see these > spikes on lab power meters, ones with screens and graphs. That's what > the headroom is for - how much extra power can be delivered in very > brief spikes (<100ms or so) when the hardware really needs it? > > If the PSU is weak in this area and can't deliver the full power, the > load will still try to draw the current, and the voltage must drop to > compensate. Simple physics. Either way, your 450W PSU might not be up to > the job when push really comes to shove for your hardware. > >
a) I know what happens if you have a bad PSU. That is why I am using BeQuiet. b) those 27% include the monitor and router. b) I know how much my computer draws at full load. 300W. Absolut maximum. All inclusive. Screen, fritzbox, powered usb hubs, computer itself. 3
