My PSU & video cards

  • Thread starter Thread starter Mirko
  • Start date Start date
M

Mirko

Hello
some days ago I wrote a post about my PSU's capability, infact my intention
is to change my videocard & probably my hard disk, maintening my 20Gb inside
as well.
I've tested voltages on 5V and 12V on 4-pin hdd molex with an analog
voltmeter. The effective voltage on +12V during 3dmarks benchmarks in
12.3-12.4V while effective 5V is 5.4V!
During pc start the voltage goes respectively on 14-15 and 7.5V, and one
second later , descend to normal values (maybe this is capacitors' power!).
I think I'll keep my psu as well , and I buy the videocard. If pc goes
unstable, I'll change PSU with an enermax on antec one! :-)
About VC's choice: with FSAA 2xQ or 4x enabled is very big the difference
between FX5750 and FX5800?? In fact in Italy it's very difficult to find the
second one!

Thanks in advance!
Mirko
 
Mirko said:
Hello
some days ago I wrote a post about my PSU's capability, infact my intention
is to change my videocard & probably my hard disk, maintening my 20Gb inside
as well.
I've tested voltages on 5V and 12V on 4-pin hdd molex with an analog
voltmeter. The effective voltage on +12V during 3dmarks benchmarks in
12.3-12.4V while effective 5V is 5.4V!
During pc start the voltage goes respectively on 14-15 and 7.5V, and one
second later , descend to normal values (maybe this is capacitors' power!).
I think I'll keep my psu as well , and I buy the videocard. If pc goes
unstable, I'll change PSU with an enermax on antec one! :-)
About VC's choice: with FSAA 2xQ or 4x enabled is very big the difference
between FX5750 and FX5800?? In fact in Italy it's very difficult to find the
second one!

Thanks in advance!
Mirko
Click to expand...
Just be careful when buying a new video card, as some actual high
performance cards require a special dedicated power connector, which are not
present on older PSU's.
 
Those numbers are not acceptable; especially on startup.
That would be a power supply failure; except the meter used is
not accurate enough. Measurements cannot use an analog
meter. Must use a 3.5 digit multimeter. If those power up
readings were from a digital meter, then a power supply needs
be scrapped as always having been defective. Those startup
voltages are on the verge of damaging electronics. But more
likely, those measurements are useless - tell us nothing -
because it was an analog meter.
 
w_tom said:
Those numbers are not acceptable; especially on startup.
That would be a power supply failure; except the meter used is
not accurate enough. Measurements cannot use an analog
meter. Must use a 3.5 digit multimeter. If those power up
readings were from a digital meter, then a power supply needs
be scrapped as always having been defective. Those startup
voltages are on the verge of damaging electronics. But more
likely, those measurements are useless - tell us nothing -
because it was an analog meter.
Click to expand...

Agree with conclusions, but the stuff about analog meters is pure
rubbish. In many cases such a meter is to be preferred. Much
depends on the sample time and interval for the digital version.
I would take a Simpson, Triplett, or Avometer over most of the
cheap DVMs available, and over all of them for some applications.
 
Even a $25 (19.4 Euro) digital multimeter provides superior
resolution compared to a typical analog voltmeter. Voltage
measurements must be accurate to less than 0.1 volts to
provide useful information.

Again, those voltage readings are too high and potentially
destructive. No voltage can startup at 7+ volts on 5 volt
power lines. That is above maximum rated voltage for most +5
volt ICs. But good voltages could measure erroneously because
an analog meter is typically just not accurate.
 
w_tom said:
Even a $25 (19.4 Euro) digital multimeter provides superior
resolution compared to a typical analog voltmeter. Voltage
measurements must be accurate to less than 0.1 volts to
provide useful information.

Again, those voltage readings are too high and potentially
destructive. No voltage can startup at 7+ volts on 5 volt
power lines. That is above maximum rated voltage for most +5
volt ICs. But good voltages could measure erroneously because
an analog meter is typically just not accurate.
Click to expand...

Please don't toppost. I fixed this one. I would have no
difficulty reading any of the analog multimeters mentioned above
to that precision. Notice they all have mirrored anti-parallax
scales. I would have a problem believing a cheap DVM to be
accurate to 1% of full scale, let alone 0.1%. Resolution is _not_
accuracy.
 
Please don't bottom post and make reading difficult. Readers
must wade through reams of previous (obsolete) posts to find
the only useful paragraph. How inconsiderate! When writing
papers, do you first print references, footnotes, and
bibliography at the top? Of course not. Papers and posts
easily read when new information is top posted. The first
thing read must be new post - not old stuff already read. Old
information is provided later as even taught in school - for
reference. Should someone - a rare condition - need to reread
old and known information, then that 'already read' text is
posted at bottom with the references, bibliography, and
footnotes.

I am tolerant enough to not be bothered that you bottom post
so as to make reading difficult. However if you want to make
my life difficult and then complain, well, expect justified
complaints about both: your 'difficult to read' posts and
your intolerance.

Since your old post is only for reference, then it is put
way down where it is easy to find should a rare thing happen -
you need to reread what you already knew. This is not a
personal attack. This is simply about making new information
easy to find - or being so tolerant as to not dictate nonsense
about top posting - the easy to read posting. Bottom posters
even make Google searches difficult and tedious because
irrelevant information is where the new information should
have been - top posted - as you were even taught in school and
as routine in professional papers.
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CBFalconer said:
Please don't toppost. I fixed this one. I would have no
difficulty reading any of the analog multimeters mentioned above
to that precision. Notice they all have mirrored anti-parallax
scales. I would have a problem believing a cheap DVM to be
accurate to 1% of full scale, let alone 0.1%. Resolution is _not_
accuracy.
Click to expand...


Don't like scrolling down to see what you already read?
Well that is what bottom posters force all readers to do.
Normally I would say nothing about your very difficult to read
posts, but you make your posts difficult to read, and then,
are so intolerant as to complain. Bottom posters even make
Google searches difficult. Bottom posters are tolerated when
they remain respectfully quiet - or need not reply.
 
Expensive analog meters have same or less accuracy and
resolution as cheap digital meters. Most analog meters don't
even have that mirrored surface because they don't have
sufficient accuracy to justify that mirrored surface. In the
meantime, Sears Hardware sells a digital multimeter for only
$18 that claims a 1.5% accuracy. A $24 multimeter that does
1% accuracy. A $40 meter that does 0.8% accuracy. No analog
meter at those prices will provide better accuracy.
 
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