First post, by slivercr
1. Latest pictures
Linux boot with Tualeron 1000@1333
Windows boot with Tualeron1000@1333
Tualeron overclocking: 1200@1600
N-Yagi's website and mods, ebay korealatins (korean modded tualatins), POST with dual 1133 MHz P3-S
MS-6905 Master ver2 mods for dual Tualatin operation
ACPI woes with Windows XP, pt.1
Dual Tualakings arrived!
RDRAM trouble and new case
"Recap", new PSU, bunk theory about ICH and 2 GB RDRAM
ACPI woes with Windows XP, pt. 2
A couple of follow-ups
Follow-up on the previous follow-ups
New case and some to-dos
RDRAM@533 MHz, pt.1
RDRAM@533 MHz, pt.2
RDRAM@533 MHz, pt.3: Failure!
RDRAM@533 MHz, pt.4: Good Failure!
Adapting korealatins for use with OR840 - !THEORY, NOT TESTED!
Capacitor shopping list (courtesy of doogie—thanks!)
Newer driver CD contents (courtesy of brt02—thanks!)—also added to the repo below
OR840 engineering sample pictures! (courtesy of SWZSSR—thank you!)
3. Current configuration
The machine sees regular use. The final—until I decide to change it 😁—configuration is;
2x P!!! 1000B
2 GB Samsung PC800-40 ECC RDRAM
NZXT H230 White
3½ Floppy drive
IDE1 > SD2IDE >> 32 GB SD [WinME]
IDE2 > DVD-RW drive
AGP > Radeon 9100
PCI1 > Voodoo2
PCI2 > Voodoo2
PCI3 > Promise SATA300 TX2 >> 128 GB SSD [Linux, Win2K] // 240 GB SSD [Installers, ISOs, HDD images, etc]
PCI4 > Sound Blaster Live! 5.1 Digital
PCI5> HP USB2 card
After all the trouble, why no Tualatins?
-The Tualatins are just too powerful. The purpose of this machine is to run a couple of pre-XP operating systems, have some fun with a few old games, and play with SMP. The Coppermines are more than enough for that, or put another way, the Tualatins are overkill for the use I give to this machine.
-Even though I'm not a stickler for "period correctness"—it can easily be seen in the parts list!—I consider the Tualatins to be out of place with the other parts I have assembled. The P3-S 1400 was released in January 2002—the 2.2 GHz Northwood released then, too.
-Putting the previous 2 together, its unpopular opinion time: Coppermines + OR840 feels like a high-end Slot 1 build, whereas Tualatins + OR840 feels like a low-end Pentium4 build. Or said differently, I'd rather have a mid or high-end Pentium4 machine than Tualatins + OR840. This is just my opinion, of course.
-Tying all those ideas together, I like how the CuMines work in SMP to essentially "become" a single Tualatin. This only happens in certain scenarios, for example, running quake3 in SMP mode with the CuMines will give me as many fps as a single P3-S 1400.
-Ultimately and most important of all, I really like slot CPUs, I like how they look, I like the engineering behind them and the problem they solved (though it was no longer a problem once Mendocino and later CuMine came out). It makes me happier to use the fastest native Slot1 CPU (if someone has engineering samples of the 1.13 GHz CuMine, hit me up!) in what I consider to be one of the coolest Slot 1 motherboards, than to use the Tualatins in modded slotkets.
4. Files can be found HERE
This is a small repository hosted at mega.nz. There are drivers, BIOS images, manuals, and relevant datasheets/white papers.
If you have anything to contribute for this board, please send me a PM and I can add it to the repo 😀
- 2020-04-16 Thanks to brt02 for a newer CD image! It's been added to the repo.
- 2020-06-05 Thanks again to brt02 for pointing out Fujitsu's Celsius650 support page! Drivers, manuals and BIOS images have been added to the repo.
- 2020-06-05 Thanks to PC Hoarder Patrol for supplying various white papers---added!
5. Original post
Hi all! Long time lurker, first time poster. I was planning on sharing my build here when it was "complete", but there is always something else to be done so I figured I'd just post right away.
I am very fond of the Celeron 300a, as I am sure a lot of people here are. I still have with me my CPU from back in the day and for a few years now I've wanted to build something around it. My original plan was to source a nice 440BX mobo and build an almost "cookie cutter" retro machine (no offense intended of course, 440BX is amazing, hence its popularity), but while browsing ebay I found a listing for a cheap, complete and in box OR840. This is a dual slot 1 motherboard with the i840 chipset and dual channel RDRAM—since I had never built an RDRAM machine I figured I might as well indulge. Thus, the original plan derailed from the get-go…
The motherboard officially only supports Pentium 3 CPUs with fsb of 100 MHz or 133 MHz, but something magical happens when you insert a 66 MHz fsb CPU: it automatically dials in a 100 MHz fsb! It was very cool to plug in the 300a and find out upon boot that it was auto-overclocked. Pentium 2 CPUs will run fine too, and as a result of this auto-overclocking the slowest CPU I can run is the P2@350 MHz.
I had to flash the BIOS to the latest version to be able to use 512MB RAM sticks, otherwise it would not boot. Even after the flash the mobo is very picky about which sticks work: I've tried all sorts of combinations and found that any 40ns rated sticks will make it highly unstable, whereas 45ns sticks will work perfectly.
The usual configuration of the machine is dual P3@1GHz with 2GB of RAM, with a Radeon 9800 Pro, an Audigy2 ZS, and a USB2 card. I use this for gaming on Windows XP and actually working on Debian 8.
Every now and then I unplug the Coppermines and plug in a single 300a, 256MB of RAM and boot up Windows ME. Thinking of this config I ordered and am waiting on a Voodoo3 2000 PCI for some quality glide gaming 😀
What I want to try
Well, to start, I would love to decide on a case. Currently the build rests in a Chieftec Bravo midtower case, the one with the front door that reveals the external bays and the power button. I like it, but is soooo heavy that lifting it to work on the PC makes my back ache. I may be crucified for this, but I prefer modern cases: working with them is a joy. All the cable routing, the grommets, the rounded edges, the psu shrouds… My modern PC sits inside a Fractal Design Define C and its a thing of beauty.
I will probably play with a pair of slotkets, too. I want to order a couple to mod for Tualatin use, and try to set up a dual Tualatin config. Every result I find when I search dual Tualatins on this motherboard seems to indicate that it is not possible, but I would still like to try.
Besides that, finding some nice overclockers would be nice. Since its an intel board I only have the option of forcing 133 MHz fsb on 100 MHz fsb cpus, which limits my options to 3 processors: the 800E@1066, the 850E@1133, and the 1000E@1333 (I could also try the 750@1000, but already own a pair of 1000EB cpus so I don't see the point). The 1000E is rare, and pretty much guaranteed to not hit 1333. The 800E and 850E are also somewhat rare, but there may be a chance for tweaking there.
Finally, I would LOVE to run a dual 300a config, but I cannot do so without modding. The mod required for this is fairly involved, but within my ability. I already have a pair of 300a, just need to get a few other supplies and find the time, so this is a long term goal.
I would love to hear your thoughts!