Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <wXyic.37579$6m4.1717504@twister.southeast.rr.com>, "JugHead
McGraw" <look@me.com> wrote:
> Thanks for the help Paul. I'm not sure the extra cost would be worth the
> modest increase in overclockability. I think I'll stick with my original
> setup, although the DDR500 does look tempting, it probably won't pay in the
> long run with cooling limitations of my setup.
>
> Of course it would be just my luck that Intel would release a 1000mhz fsb as
> soon as I get this thing running.
>
> To tell you the truth, I'm tired of chasing the speed demon. I'm only
> upgrading my PC in the first place because I am going to give my old one to
> a family member to use in their home business since it is extremely stable
> and reliable. They're paying me about what an equivalent Dell would cost,
> so I'm taking the cash and making it go a little further.
With DDR400 memory, you can run FSB:MEM ratio of 5:4, and
do a 25% overclock on the processor, without the memory having
to go faster than DDR400. The DDR400 memory gives you the option
of 1:1 ratio and no overclock, or the 5:4 ratio and the potential
to overclock. The 5:4 ratio is available when you select "DDR333"
for the memory.
The benefit of the DDR500 memory, is you run 1:1 all the time,
and overclock plus 1:1 is slightly faster than overclock plus 5:4.
So, you can still try some overclocking with the DDR400 memory.
PC4000 memory is for when you want "memory bandwidth bragging
rights".
Paul
>
>
> "Paul" <nospam@needed.com> wrote in message
> news:nospam-2404041254010001@192.168.1.177...
> > In article <OQvic.113064$04.1517119@twister.southeast.rr.com>, "JugHead
> > McGraw" <look@me.com> wrote:
> >
> > > I would like to overclock the CPU to a "reasonable" level, as I will
> have 6
> > > case fans (counting two in the PSU) and an aluminum case, but no special
> > > cooling setup. Maybe a modest 3.5 or 3.6 ghz. But even with a modest
> > > overclock, will the memory bandwidth benefits be worth it to use the
> PC4000
> > > DDR500?
> > >
> > > I'm currently running a P4 2.2ghz overclocked to 2.42ghz on a P4T533-C
> with
> > > 1066 RAMBUS, which utilizes 100% of my memory bandwidth (actually a
> little
> > > more). With overclocking this system, the memory has always been the
> > > limiting factor, as the CPU temp has never risen above 112F under full
> load,
> > > which is well below specs.
> > >
> > > My thought is that with the DDR500 I would get a little more room to
> > > overclock, so I could get better performance up to a reasonable CPU temp
> > > without having to first worry about the memory limitations like I
> currently
> > > have with the 1066 RAMBUS.
> > >
> > > I'll check out the site, but I've read reviews of this board using the
> > > DDR500 DIMMS and overclocking, but they never give any sense of the
> > > relstionship between performance and CPU temp, but I assume this can
> vary
> > > from case to case and depending on individual cooling setups.
> > >
> > >
> > > "Paul" <nospam@needed.com> wrote in message
> > > news:nospam-2404041008340001@192.168.1.177...
> > > > In article <nAoic.108560$04.1473257@twister.southeast.rr.com>,
> "JugHead
> > > > McGraw" <look@me.com> wrote:
> > > >
> > > > > Meant to put that x2, so I'll have 1GB
> > > > >
> > > > > Can this board take the DDR500 PC4000 DIMMS?
> > > > >
> > > >
> > > > Yes.
> > > >
> > > > Remember, though, that PC4000 memory is an "overclockers memory".
> > > > It is intended for people who will be overclocking permanently.
> > > > In your case, to get full use from the memory, your processor
> > > > would have to run at:
> > > >
> > > > DDR500
> > > > 3.2GHz * ------ = 4.0GHz
> > > > DDR400
> > > >
> > > > You can run a PC4000 memory at DDR400 rates, but the timings
> > > > might not be as tight as a low latency memory selected for
> > > > running at DDR400.
> > > >
> > > > Check this website, to see how overclockable your processor
> > > > will be. With the 1MB cache, I guess you are buying a
> > > > Prescott. The website appears to be down right now, so I
> > > > cannot look up your processor to verify how much overclocking
> > > > headroom it might have.
> > > >
> > > > http://www.cpudatabase.com/CPUdb/
> > > >
> > > >
> >
> > All I'm saying is, plan your processor speed and memory purchase,
> > based on the most likely operating conditions. If you are going
> > to spend a lot of extra money, for the small gains that performance
> > memory buys you, at least make sure the two match.
> >
> > I like easy overclocking targets, like how much can you overclock
> > with only air cooling and little or no Vcore increase. The
> > cpudatabase.com site can answer that question (it is still down
> > for me - cannot be reached).
> >
> > A given cooling solution achieves so many degrees rise per
> > watt of input power. Let us pretend that is a constant for
> > a moment.
> >
> > Power consumption in a CMOS circuit is proportional to
> > FCV**2. (Frequency, Capacitance, Voltage squared). Increasing
> > frequency alone gives a linear increase in delta_temp with speed.
> > If your overclock also needs some extra Vcore, then a higher
> > order function is implied, because F and V are increasing at
> > the same time. In effect, there will be an abrupt point
> > where you'll start contemplating one of those "bar fridge"
> > R404 based coolers. Or maybe blocks of dry ice or an LN2 dewar.
> >
> > HTH,
> > Paul
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