Asus P4P800SE/P42.8 533

[N´far]

Just a quick one...
Will the board be able to run DDR 400 at FSB 133 to 166?

 

[Bill Smith]

most memory mfg's will spec thier modules to run down 2 or 3 steps,
but that would be something to find out prior to purchasing your ram.
As a rule, you should be pretty safe with a name brand purchase
specked at one speed above what you may require. That will at least
give you an upgrade path without purchaing new memory...

So yes, ddr400, in most cases, will run fine at 133x4fsb. I believe
that board will run 400?, 533 and 800 fsb cpu's so that point is mute.
Concentrate on the memory spec...


ñíñjà¤têç

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[N´far]

most memory mfg's will spec thier modules to run down 2 or 3 steps,
but that would be something to find out prior to purchasing your ram.
As a rule, you should be pretty safe with a name brand purchase
specked at one speed above what you may require. That will at least
give you an upgrade path without purchaing new memory...

So yes, ddr400, in most cases, will run fine at 133x4fsb. I believe
that board will run 400?, 533 and 800 fsb cpu's so that point is mute.
Concentrate on the memory spec...

Hey Bill,

thanks for your reply.

I already got a stick of DDR 400, so my question would be if the board has a
memory divider like CPU/MEM 4:5. Remember FSB 166...

Happy new year......

 

[Bill Smith]

the board does, as it supports 533(166) or 800(200) fsb, but you have
to see if the spd on the memory module has that spec(166)...try it as
I'm sure it does. I have usually bought my ddr memory one spec above
what my fsb is currently running, in anticipation of cpu upgrade
path...

Happy New Year to you as well !


ñíñjà¤têç

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[Paul]

Hey Bill,

thanks for your reply.

I already got a stick of DDR 400, so my question would be if the board has a
memory divider like CPU/MEM 4:5. Remember FSB 166...

Happy new year......

The 875/865 based boards I've looked at, have this table in the
manual. Your 533MHz processor will run the memory at DDR333 or
DDR266. It doesn't look like the memory can be run faster.
And in dual channel mode, two sticks will match the FSB transfer
rate anyway. Just make sure you use two matching sticks.
The leftover "headroom" can be used for overclocking later.

CPU FSB DDR DIMM Type Memory Frequency
800 MHz PC3200/PC2700*/PC2100 400/333*/266 MHz
533 MHz PC2700/PC2100 333/266 MHz
400 MHz PC2100 266 MHz

*When using 800MHz CPU FSB, PC2700 DDR DIMMs may run only at
320MHz (not 333MHz) due to chipset limitation.

The place to look for more info, is over here:
http://abxzone.com/forums/search.php

No mention here of dividers, other than the ones listed in the
Asus manual.

http://abxzone.com/forums/showthread.php?t=49814&highlight=p4p800+ratios

HTH,
Paul

 

[Richard]

I believe the dividers are based on the fsb and the memory speed
selected and not given as a numerical ratio in the bios. I wanted to run
my 2.4c at 250fsb with pc3200 (DDR400), so I set the fsb to 250 and the
memory to DDR400. Wouldn't boot. I then set the memory to DDR320. The
computer booted into WinXP. I checked things with cpu-z and found the
computer running at 250 fsb and 400DDR. I would say set the fsb to what
is right for your cpu and then try different DRAM frequencies.

 

[N´far]

I believe the dividers are based on the fsb and the memory speed
selected and not given as a numerical ratio in the bios. I wanted to run
my 2.4c at 250fsb with pc3200 (DDR400), so I set the fsb to 250 and the
memory to DDR400. Wouldn't boot. I then set the memory to DDR320. The
computer booted into WinXP. I checked things with cpu-z and found the
computer running at 250 fsb and 400DDR. I would say set the fsb to what
is right for your cpu and then try different DRAM frequencies.

Setting DDR266 is 1:1 here ( FSB 160= DDR320). DDR 333 means CPU:MEM 4:5
(FSB160=DDR400) with some PC2700 and a P4B CPU.
Checked it with CPUZ as well.

Thanks for your help.

G.