"redrider" wrote in message
. rogers.com...
Well I do not understand this divider stuff I quess, anyone got a site
that
explains it better so that i understand it?
"wasdiscovered" wrote in message
...
"redrider" wrote in message
ble.rogers.com...
I posted a message before, and had good response, thanks, just need a
clarification on CPU speeds and memory ratios.
My 2.8 is running at 3.09 and ram, which is DDR 433 Kingston runs at
400.
How can I get more speed out of the ram?
Voltage?
Faster CPU, say a 3.2?
Thanks
I assume that by saying your memory is running at 400 you mean that
you're
running a divider of 1:1.
I also assume that your agp/pci is locked.
I'm not familiar with your board but I would suggest that you also lock
your memory divider and memory timings to specific values.
If your memory divider is set to auto your board might switch to a 4:5
divider when you get around 215 to 220.
It might also change the memory timings or maybe not.
This can cause a no boot situation even though your memory is capable of
running at 4:5.
It's a particular problem with some fast memory.
As far as your chip is concerned forget about the 3.2.
A 2.8C (M0) with the proper memory voltage and cooling can do over 4
gigs.
Even on a half decent set up you should do quite well with any 2.8C.
3.09 is about what I get from my 2.4B rig.
With the limited info you've given I'd suggest you run a 4:5 memory
divider.
You will probably get better benches, better performance and better
memory
bandwidth with your best 4:5 as opposed to your best 1:1. Of course I'd
also suggest pushing it at 1:1 just to make sure. Also don't tighten
your
timings until you've determined your max stable over clock.
At a certain point you will need to up the juice to the chip. You then
need
to check your system temps under full load. Idle temps should never be
used.
Check the idle temp but never use it to determine your next adjustment.
As
far as memory voltage goes some people like to start upping it before
they
need to. Actually with some memory over volting it not only gives little
benefit but may actually limit your over clock. It depends on the
memory.
On
the other hand some people run there memory under volted because they
fail
to check what the memory manufacturers recommended voltage is. Fast
memory
often needs more voltage then a boards stock setting gives.
Some times a single setting in bios can trip you up. As a general rule
if
you know what a particular setting does and what it should be set to
then
never leave it set to auto thinking the board will choose the best
setting
for your particular setup. It usually does but not always. If you don't
know
what it does then leave it on auto for the time being. You can try to
find
out what it does using a search engine or ask the board maker. Don't be
surprised if a google search doesn't turn up much or if the board maker
isn't quite sure about some of the settings either. At a high end over
clock
tweaking the unknown settings ( I call this crash and burn) in fact
playing
with all but a few taboo settings is a definite option. Reading up in
board
specific groups is always helpfull.
Check your power supply voltages and look for fluctuations and dips.
Power
is as important as cooling. Actually it is the other side of cooling.
For
every little bit that your system temp increases a bit more strain is
put
on
your power supply.
Check the homepage of both your memory and board maker to see if they
consider there product to be compatible with the other. Fast quality
memory
and a fast quality board should make for a nice system but this is not
always the case.
You might consider Updating your system drivers along with your bios.
On the other hand this could actually cause problems if they are not
properly
tested before release. Actually with some the release is the bigger part
of
testing.
If your rig is set up with multiple drives and other bells and whistles
disconnect them for now. Only run what you need to run and nothing else.
That does not mean you cannot or should not have the bells and whistles.
After you push your rig to its furthest limits test for 100% stability.
100%
stability will be below your rigs furthest limits. A this point consider
bringing it down a notch or two more. Now add the bells and whistles and
again check for 100% stability.
If you can't get your rig to smoke post back with complete system
specs.
I'm not saying that with more info I could be of more help to you.
I don't know. Actually I don't know as much as some of the people in
here.
I've been over clocking for about a year and lurking in various groups
for
a
good part of that time. What I do know is that the better the picture
people
have of your setup the easier it will be for some one to perhaps point
out
some small over looked factor which creates what seems to be your wall.
As for my wall I can't get this 2.8C to run at 4.0 gigs with a 1:1
memory divider.My rig is 31 inches high 22 inches deep and 20 inches
wide.
I'm not sure exactly how much it weighs but I would estimate that it's
maybe
between a hundred and a hudred and fifty pounds.
Of course these would not normaly be the type of specs I would post in
order
to get advice on how to over come an obstacle. Actually I already know
what
the obstacle is. My pc4000 will not run higher than 544mhz which is a
good
bit past what its actual rated speed is. To get to 4.0 I need 580mhz.
I'd
get pc4400 (which I believe is the fastest at the moment) if I knew it
would run at 580mhz. That would be 30mhz over spec.On the one hand I
figure
it would do it but on the other hand I'm not going to get it with out
knowing for sure.Who knows maybe they will put out something that's
specked
to 580mhz. I'll be waiting.
see ya
This might help......
FSB Frequency
DDR266 (FSB:MEM=3:2)
DDR333 (FSB:MEM=5:4)
DDR400 (FSB:MEM=1:1)
Memory Name
200 MHz
133 MHz (DDR266)
160 MHz (DDR320)
200 MHz (DDR400)
PC3200
210 MHz
140 MHz (DDR280)
168 MHz (DDR336)
210 MHz (DDR420)
217 MHz
145 MHz (DDR 290)
173 MHz (DDR 346)
217 MHz (DDR434)
PC3500
220 MHz
147 MHz (DDR293)
176 MHz (DDR352)
220 MHz (DDR440)
230 MHz
153 MHz (DDR306)
184 MHz (DDR368)
230 MHz (DDR460)
233 MHz
155 MHz (DDR310)
186 MHz (DDR373)
233 MHz (DDR466)
PC3700
240 MHz
160 MHz (DDR320)
192 MHz (DDR384)
240 MHz (DDR480)
250 MHz
167 MHz (DDR333)
200 MHz (DDR400)
250 MHz (DDR500)
PC4000
260 MHz
173 MHz (DDR346)
208 MHz (DDR416)
260 MHz (DDR520)
267 MHz
178 MHz (DDR356)
213 MHz (DDR426)
267 MHz (DDR533)
PC4200
270 MHz
180 MHz (DDR360)
216 MHz (DDR432)
270 MHz (DDR540)
275 MHz
183 MHz (DDR367)
220 MHz (DDR440)
275 MHz (DDR550)
PC4400
280 MHz
187 MHz (DDR373)
224 MHz (DDR448)
280 MHz (DDR560)
290 MHz
193 MHz (DDR386)
232 MHz (DDR464)
290 MHz (DDR580)
300 MHz
200 MHz (DDR400)
240 MHz (DDR480)
300 MHz (DDR600)
PC5000
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