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SLI and power suppliy



 
 
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  #31  
Old April 13th 07, 08:41 AM posted to alt.comp.periphs.videocards.nvidia
DRS
external usenet poster
 
Posts: 588
Default SLI and power suppliy

"Phil Weldon" wrote in message
k.net
"Bobby D" wrote in message
t...
The root post in this thread is about how much PSU is needed...
That's what I replied to. You can't deduce that?


Wouldn't have to if you had replied correctly. That is, used your
newsreader to reply to that initial post, rather than to another. That
will keep a thread organized.


So will keeping the standard attribution format at the top of the post and
snipping excess cited material.


  #32  
Old April 14th 07, 05:44 AM posted to alt.comp.periphs.videocards.nvidia
Bobby D
external usenet poster
 
Posts: 9
Default SLI and power suppliy

I read every post in the thread, and replied to the NG thread at the last
(most recent) post. Sorry if that didn't meet your requirements for having
"replied correctly".... FAH

BobbyD


"Phil Weldon" wrote in message
k.net...
'Bobby D.' wrote:
The root post in this thread is about how much PSU is needed... That's
what I replied to. You can't deduce that?

_____

Wouldn't have to if you had replied correctly. That is, used your
newsreader to reply to that initial post, rather than to another. That
will keep a thread organized.

Phil Weldon

"Bobby D" wrote in message
t...
The root post in this thread is about how much PSU is needed... That's
what I replied to. You can't deduce that?




"Phil Weldon" wrote in message
ink.net...
And you are responding to which post?

Phil Weldon

"Bobby D" wrote in message
...
Let me see here. I'm going to spend drop $900 for the fastest
processor, $600 for each of the two 8800GTX SLI cards, $200 - $300 for
the latest MB, twice that for good DDR2 memory at least in the 2 Gb
size, another $200 plus for each Raptor drive... Etc.. Etc...

After getting that together, what dunce would even consider worrying
about $100 here or there in getting a PSU that's up to the task, with
adequate additional capacity (like the other components mentioned) to
ensure this machine works at peak performance levels?

Do yourself a favor and add a Coolermaster Real Power Pro 850W
(RS-850-EMBA) or comparable PSU, that is SLI ready, with a silent fan,
and that never breaks a sweat. It's a no brainer.

System Specs
Asus Striker Extreme
Quad Core X6700 at 2.66 GHz (stock speed for now)
2 eVGA 8800GTX 768-P2-N837-AR in SLI
2 Gb, Corsair Twin2X2048-400C4PRO
2 WD1500ADFD Raptor 150 Gb Drives
Windows Vista Ultimate
PSU aforementioned Coolermaster Real Power Pro 850W

BobbyD...


"Phil Weldon" wrote in message
thlink.net...
'Mr.E Solved!' wrote, in part:
| I do not disagree that marketers are trying to get more money from
| misinformed consumers by "up-selling" wattage ratings on otherwise
| mediocre PSU's. My point is that the industry needs to adopt the
same
| reformations that home stereo component and speaker manufacturers
did in
| the 80's. Dropping the numbers games and focusing on what units can
| power which devices.
_____

Yeah, right. Look at all the output power ratings for audio amplifier
output levels: RMS, Peak RMS, Acoustic Power, Peak Acoustic (at a
supposed
ratio of 1:2:4:8) and the dependence of output on the speaker
impedance
(8:4:2 Ohms). And look at the amplifiers that are labeled with an RMS
power
output greater than the total AC power consumption. Standards to
advertisers and merchandisers are vague at best, and something to be
ignored
a worst.

Thus the need for an educated buyer. Without trying to understand the
manufacturing standards a buyer is at the mercy of those who either
ignore
or don't understand the standards. In "Dropping the numbers games and
focusing on what units can power which devices." you bury your head in
the
sand.

The topic is not annoying, a 'know-nothing' attitude is.

By the way, according to ATX 12V rev 2.2, Energy Star requirements for
power
supplies rated at over 450 Watts are equal to or less than 10% of the
rated
maximum continuous power rating.

Phil Weldon




"Mr.E Solved!" wrote in message
. ..
| Phil Weldon wrote:
| 'Mr.E Solved!' wrote, in part:
| | a PSU with a larger capacity than the current required by the PC
| | draws no more power from the wall than a smaller PSU that still
has a
| | larger capacity than the current required.
| _____
|
|
| Not so (see Energy Star requirements at
|




://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf
).
|
| You are incorrect, I will politely correct you again, but please,
this
| topic is annoying enough without having to argue that which is
| understood already.
|
| The Energy Star requirements for ATX v2.2 are only considered when
the
| APIC v1.1 of v1.4 enabled PC is in STR Mode 1 or 3, not when in
actual
| use (or off). The scaling of AC current draw from the line as it
applies
| to the continuous available wattage rating of the PSU, as indicated
on
| page 22, section 3.2.5.2, table 10, is relevant only when the PC is
in
| sleep or hibernate mode (STR1&3).
|
| Yes, larger power supplies can draw minimally more current when in
sleep
| mode than smaller capacity PSU's. This is a function of the design
of a
| switching power supply and has zero relation to full power modes
which
| is the primary, most used and most costly mode of PC use. Most high
| wattage PSU users do not use sleep or hibernate mode, due to the
nature
| and limitations of sleep and hibernate mode. STR1&3 is most useful
in
| portable and battery operated laptops where the minimal wattage
| differences actually effect lifetime. The differences are minimal,
vary
| by manufacturer, and the referenced chart is a guideline for
| certification, not actual draws from the line current or specific
units.
| Many designs beat those specifications by virtue of their efficiency
| rating being near to 80% in standby mode, not the recommended (and
| rather poor) 50% efficiency of the specification.
|
| That you send me a link to a 45 page PDF which goes into minutia of
the
| electrical specifications of ATX v2.2, is the very point of my
initial
| assertion that the consumer has precious little meaningful guidance
and
| is in fact mis-served by the distilled information from the
| specification that ends up on the outside of the retail box.
|
| Lastly, marginal power supplies (those that just barely meet the
current
| needs of the PC system) are the ones that generate more waste heat
since
| they are at the limits of the specifications of their components.
Over
| built supplies achieve far better performance by having components
that
| are not stressed under use. The PSU's fans spin slower as well (if
at
| all) since ambient temperatures (which negatively affect efficiency)
are
| lower due to reduced resistance in the internal circuitry. As the
| temperature rises, so does resistance, which in turn raises the
| temperature again, lowering efficiency.
|
|
| And what about 'certification list encourages overspending on
unneeded
| capacity'?
|
|
| I do not disagree that marketers are trying to get more money from
| misinformed consumers by "up-selling" wattage ratings on otherwise
| mediocre PSU's. My point is that the industry needs to adopt the
same
| reformations that home stereo component and speaker manufacturers
did in
| the 80's. Dropping the numbers games and focusing on what units can
| power which devices.
|
|
|
|
|











 




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