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!)
3. Current configuration
The machine sees regular use, but the config is regularly changing as I try out other hardware and stick with it for a while.
2x P3 1000
2 GB Samsung PC800-40 ECC RDRAM
IDE1 = IDE2SATA adapter: 16 GB SSD [Win98] / 80 GB HDD for testing different OS
IDE2 = DVD-RW drive
3½ Floppy drive
Sound Blaster Live! 5.1 Digital
Promise SATA150 TX4: 2x128 GB SSDs [Linux, Win2K], 512 GB HDD [Installers, ISOs, etc]
A small repository of files can be found HERE. It includes drivers, BIOS images, manuals, and some relevant datasheets. If you have anything to contribute for this board, please send me a PM and I can add it to the repo 😀
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!