View Full Version : New on-line PSU calculator
burebista
12-12-2006, 08:57 AM
Yes I know most of them are crappy and I'm not a big fan of on-line PSU calculators, but this one (http://web.aanet.com.au/SnooP/psucalc.php) surprise me.
Pretty close to my power needs, in fact the result on site is identical with my consumption from wall measured by a Kill-A-Watt device: 136W in full-load with ABIT KN9, AM2 X2 3800+, BFG 7900GS OC, 2 sticks of RAM, 1 HDD, 1 DVD-RW, 1 PCI card, 1 case fan, 80% M-12 500 efficiency.
My real PC needs are 136W x 0.8 = 109W, but it's pretty close.
CAD4466HK
12-12-2006, 08:12 PM
Hmmmm
This calculator said I could get by with a "generic" 705w PSU 36.8A@+12v
and a "recommended" 408W PSU 29.6A@+12v.
But when I SLI'ed 8800GTX's, it went to "generic" 955w PSU 50.1A@+12v
and a "recomended" 558w PSU 40.8A@+12v:eek:
krampak
12-12-2006, 08:38 PM
With my benchmarking configuration (http://www.hardlimit.com/forum/showpost.php?p=383600&postcount=289) it recommends me:
Recommended PSU wattage for generic brand PSU:1165w
Recommended 12V combined amps for generic brand PSU:61.2A
Recommended PSU wattage for decent brand PSU:684w
Recommended 12V combined amps for decent brand PSU:50.3A
:eek:
CAD4466HK
12-12-2006, 08:57 PM
I wonder how much a "generic" 1165w PSU goes for:confused:
CAD4466HK
12-12-2006, 09:02 PM
Is it me, or do these guys love Antec, check out the recomended list:lol:
dqniel
12-12-2006, 10:28 PM
Interesting. The wattage ratings seem to be really weird though. Venice 3000+ @ 1.66v and 3.0ghz uses half the power of an e6600 @ 4.0? (73w as opposed to 149w) I doubt it...
This seems to be the best of the "psu calculators" but it's still a bit off. recommends 414w / 30a for my single 6600gt system. Far better than the extreme outervision crap of 650w and no amperage rating..
The overclocking part is way off. My E6600 at 3.6 GHz takes almost twice as much as this says.
Non-overclocked looks much better than that Xtreme PSU calculator.
ceewi1
12-16-2006, 06:43 AM
The overclocking part is way off. My E6600 at 3.6 GHz takes almost twice as much as this says.
Non-overclocked looks much better than that Xtreme PSU calculator.
It does seem to have a few issues updating the output with new data. When I put the same data in, including overriding the default CPU wattage to the full TDP, I get the same output from the overclocking section as with the Xtreme calculator, though.
fullmetal chocobo
12-16-2006, 05:20 PM
Hmmm. I would have loved to see what this place would recommend for my dual Xeon system. LOL
jonnyGURU
12-19-2006, 11:30 AM
Odd... Seems to be live on SilentPCReview's server too:
http://www.silentpcreview.com/article703-page1.html
Bun-Bun
12-19-2006, 03:52 PM
It recomends an 850 watt PSU with 62.5a on the 12v for my new QX6700 SLI 8800GTX rig.
I might need to beef up the M12-700... :rolleyes:
SKYMTL
12-19-2006, 04:21 PM
Seems like complete BS to me. I'm running an X2 3800+ oc'd to 2.6Ghz, a 7900GTO, 2 HDs, 4 case fans and 2 optical drives.
For a generic PSU: 635W
For a "decent" PSU: 335W
Come on......
Dainas
12-19-2006, 04:28 PM
Well it would be nice if I could get away with a 450w. Btw, the silentpcreview is missing a few details to the other(like dram voltage).
Micutzu
12-19-2006, 04:44 PM
CPU power overclocking calculations seem OK, there is a law that power increases linearly with the voltage and exponentially with the voltage (double voltage = 4 times more power). This treats the CPU + Vcore regulator as a simple resistive load wich has no connection with reality, but the aproximation is quite exact, as proven in practice.
The only thing that i'd like to comment upon is that the system is NEVER in full load (every power part working at full capacity simultaneously), that's why for example Bun-Bun can use his 850W-needing rig with a good 700W PSU without any problem at all. The M12 can do 700W constantly and probably close to 800W for short periods, but the rig won't EVER touch that ... maybe it'll average in the 500W+ area in what you'd call "full load" (playing one of the latest games for example) and peak sometimes a little higher, but that's it.
Very similar example, i've ran this (http://service.futuremark.com/compare?3dm06=669258) with the 700W U25 Tagan flawlessly ... calculations require 854W PSU; if the calculator knew i overvolted the GPU's it would've asked for a 950W PSU i think :D.
jonnyGURU
12-19-2006, 05:02 PM
The only thing that i'd like to comment upon is that the system is NEVER in full load (every power part working at full capacity simultaneously....
Exactly. You have these calculators that calculate CPU @ 100%, all RAM @ 100%, all drives spinning full RPM, full seek, etc. all at the same time. That's just not going to happen in real life.
Bun-Bun
12-19-2006, 06:11 PM
That reminds of when I was sizing fuses for my car stereo. The one amplifier is rated at 80 amps but my 50 amp fuse never blew with two amplifiers on it. I now have a 250 amp fuse however....
PSU-FTW
06-24-2007, 12:30 AM
It recomends an 850 watt PSU with 62.5a on the 12v for my new QX6700 SLI 8800GTX rig.
I might need to beef up the M12-700... :rolleyes:
It recommends with room to spare.
Above that it tells you how much power you will need on the +12V while gaming, so if the PSU has more power than that it should run, but headroom is always nice..
Battle_Rattle
06-24-2007, 02:59 PM
JG ... I smell an opportunity for your website... I would like to see a PSU calculator based on your personal thoughts.
It's a bit of a minefield i know... but with proper explanations it would be a great resource.
Spectre
06-24-2007, 03:45 PM
JG ... I smell an opportunity for your website... I would like to see a PSU calculator based on your personal thoughts.
It's a bit of a minefield i know... but with proper explanations it would be a great resource.
The amount of work neccesary to get it up and running is staggering, to maintain it is almost impossible. Far too many components and combinations.
The amount of work neccesary to get it up and running is staggering, to maintain it is almost impossible. Far too many components and combinations.
I agree 100%, things change way to fast for an individual to try and keep up to date on all the specs and then get them in a working calculator. Been there done that.
Bun-Bun
06-26-2007, 12:27 PM
It recommends with room to spare.
Above that it tells you how much power you will need on the +12V while gaming, so if the PSU has more power than that it should run, but headroom is always nice..
Heh way to bring up a old thread ;)
I was being sarcastic in my post :P
EDIT: Redid the calculation and this time it gave
Recommended PSU wattage for decent brand PSU: 689
Recommended 12V combined amps for decent brand PSU: 51.2
vBulletin® v3.8.1, Copyright ©2000-2012, Jelsoft Enterprises Ltd.