Hello Asus Users,
In case anyone is still interested, I was able to get my system to run
stable with following set up:
Slot A1 = 512 MB: MR18R162GDFO-CT9 ECC, 512/16 1066-32P
Slot A2 = 256 MB: MR18R1628DF0-CT9 ECC, 256/8 1066-32P
Slot B1 = 512 MB: MR18R162GDFO-CT9 ECC, 512/16 1066-32P
Slot B2 = 256 MB: MR18R1628DF0-CT9 ECC, 256/8 1066-32P
I ran both Memtest86+ and Windows Memory Diagnostic overnight with zero
errors, have run 3dMark2006 for many runs with zero errors/crashs and
Oblivion runs without crashes.
The key to success seems to be the new 256 MB modules I bought. Previously,
I had tried with these modules and got errors in Memtest and games:
2x 256 MB: MR16R1628DFO-CTF9 non-ECC, 256/8, 1066-32P
I now have these modules and everything is rock solid:
2x 256 MB: MR18R1628DF0-CT9 ECC, 256/8 1066-32P
The previous memory was not defective since it ran without errors in Memtest
by itself and only produced errors when used with the 512 modules.
I guess you could attribute it to the fact that new modules are ECC and so
all of my modules are now ECC, and previously I had a mix (although the
P4T533-C will automatically disable it if non-ECC's are present).
I'm stoked because with 1.5GB RAM and an X1950 Pro AGP card I can squeeze
another year out of my P4T533-C system. Oh yeah!!
Cheers, E.
>
>
>
>
>>
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Dear All,
Thanks to Barry for his feedback below. I also suspected that it was a
chipset limitation, so I downloaded the datasheet for the 850E Memory
Controller Hub from Intel.com and as far as I can gather, my configuration
should run with the chipset. Here's why:
Current configuration:
2x 256MB PC1066 Samsung modules with 8 chips/devices on each module, memory
density is 256Mb ((256Megabytes/8devices)*8bits=256Megabits)
2x 512MB PC1066 Samsung modules with 16 chips/devices on each module, memory
density is 256Mb ((512Megabytes/16 devices)*8bits= 256Megabits)
So, I have a total of 1,5 GB RAM with 48 devices/chips on two channels, or
24 devices per channel (A & B), and I have a RAM density of 256Mb; FSB is
533.
If you refer to the Intel datasheet, you can read on page 9:
-Supports 128-Mb, 256-Mb, and 288-Mb RDRAM densities
-Supports up to 32 Direct RDRAM devices/channel for 300/400 MHz RDRAM, 24
devices/channel for 533 MHz RDRAM
-Dual-Channel maximum memory array size is 1 GB using 128Mb RDRAM technology
and up to 1.5 to 2 GB using 256Mb/288Mb RDRAM technology
This seems to verify that the chipset would support my configuration, since
my configuration meets all of these criteria. However, I did find something
on page 15 that seems to contradict what is said on page 9: "For 82850E MCH
PC1066 RDRAM a maximum of 24 RDRAM devices are supported on the paired
channels." It essentially says that it supports a *total* of 24 devices on
both channels. I think this is a typo since that number is very low and
would mean that I couldn't even run a 1 GB configuration consisting of 4x
256/8 or 2x 512/16 as they would have 32 devices/chips total and both of
these configurations have run fine on my systems without errors using
memtest.
So the bottom line is that the chipset should support my configuration but I
still get error messages with Memtest.
BTW, I've also been checking the web for memory modules, and have yet to
find any Samsung 512 modules with less than 16 chips/devices on the module.
Any suggestions/feedback would be much appreciated. Thanks.
E. Kohl
----- Original Message -----
From: "Barry Watzman" <>
Newsgroups: alt.comp.periphs.mainboard.asus
To: "ekohl" <>
Sent: Tuesday, August 22, 2006 1:53 AM
Subject: Re: P4T533-C unstable with 1.5 GB RAM
> If you have ANY errors, the system is unacceptably unreliable. And I
> want to warn you that this could really bite you later. For example,
> you could save a document, and chacters could be changed at random. You
> could save a spreadsheet (or a tax return) and numbers could be changed
> at random. With no warning or error at all visible to you at this time.
> This could be catastrophic.
>
> Now I'm going to tell you the likely cause of your problem:
>
> There is a limit on the number of CHIPS (not modules) that the 850e (or
> any other chipset, really) can drive. I don't remember what it was, but
> I'm thinking it was 16 or 32. The Intel data sheet will have this
> information.
>
> Your RDRAM modules, like any memory module, is made of of many chips
> inside, in the case of RDRAM under the heat spreaders on one or both
> sides of the module PCB. The number varies. And, further, different
> modules of the same size can have different numbers of chips. For
> example, a module whose total size is 256MB can be made from:
>
> -Four chips of 64MB each (found in latest / newer modules)
> -Eight chips of 32MB each
> -Sixteen chips of 16MB each (found in early / old modules)
>
> What's likely is that your combination of modules is exceeding the drive
> capability of the chipset.
>
> There are only two solutions:
>
> -remove the two 256MB modules and operate with only 1GB of total memory
>
> or
>
> -replace either or both sets of modules with modules of the same size
> (or larger, if you want) but made up of fewer actual chips.
>
> The number of chips is shown on the label of a fully labeled module.
> For example, right now I'm looking at a samsung module that says on the
> label "512MB/16". This is a module of 512MB total size, made up of 16
> chips (eight on each side of the PCB), each chip being 32K.
>
> Believe me, it's better to operate with 1GB and zero memory errors than
> with 1.5GB in a system that can't run a memory test without errors.
>
> Hope that this is helpful.
>
>
"ekohl" <> wrote in message
news:...
> Dear Asus Friends,
>
> When I have 1.5GB RAM installed on my P4T533-C, I get random crashes to
> desktop (and occasional restart) when I play Unreal Tournament 2004. I'm
> playing UT2004 for stress testing (and it's fun :-)). I want to use the
> computer for video editing, so I would like to have the extra RAM.
> Non-stressful programs, e.g. Windows, IE, Outlook, seems to run fine when
> 1.5 GB is installed (though I seem to remember some instability with
> iTunes). I also ran Memtest for one pass from DOS with 0 errors. When it
> crashes to destop from UT2004, I get the error message "General Protection
> Fault." The error message comes from the game engine, i.e. I get no BSOD.
> I
> previously had 1GB RAM (4x 256) installed and everything ran rock solid.
> I'm
> pretty sure it's a RAM problem because whenever I switch back to 1GB,
> either
> 4x256 or 2x512, everything runs fine.
>
> Here are my specs:
>
> P4T533-C rev. 1.03 (latest BIOS 1010c)
> P4 3.06 GB (533 FSB, Hyper-Threading enabled in BIOS, "ACPI
> Multiprocessor"
> PC in Windows, fresh install after purchasing HT P4)
> Samsung RIMMs:
> 2x 256 MB: MR16R1628DFO-CTF9 non-ECC, 256/8, 1066-32P
> 2x 512 MB: MR18R162GDFO-CT9 ECC, 512/16 1066-32P (double-sided)
> (ECC is disabled in BIOS)
> Windows XP Prefessional SP2 installed
> ATI 9700 Pro with latest Catalyst Drivers (6.4)
> Audigy 2 with latest driver installed
> Intel Application Accelerator 2.3.0 installed
> 3x Western Digital Drives: WD800JB, WD800JB, WD2500JB (no RAID)
> LG DVD burner GSA-4081B
> 400W PSU
>
> I tried the RAM in two different configurations, but both caused the GPF
> error in UT2004:
>
> A1=512MB A2=256MB
> B1=512MB B2=256MB
>
> A1=256MB A2=512MB
> B1=256MB B2=512MB
>
> I tried ending all background "processes/services" in task manager, but I
> still had crashes in UT2004. And when I have 1GB installed it runs fine
> even
> with all prcesses/services running and even my virus protection AVG turned
> on. I haven't tried my video editing software because I want the system
> stable before doing that.
>
> I read somewhere that the chipset can't handle more than a certain number
> of
> memory devices (actual chips on the module), and so I think this could be
> the issue. I think the 512 modules each have 16 devices and the 256
> modules
> have 8 devices. That would be a total of 48 devices.
>
> Another possibility is the fact that the 512s are ECC and the 256s are
> non-ECC, but ECC is disabled in BIOS.
>
> It's strange because I heard that the P4T533-c will support 1.5 GB 1066
> RAM.
>
> I can go back 1GB, but a paid a fair amount for the 512 modules and would
> like to have the extra RAM for video editing. Any help would be greatly
> appreciated. Thanks.
>
> Regards,
>
> Edward
>
>
>
>
>
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