RayeR wrote on 2024-09-22, 12:30:

This doesn't worth, similar crappy chipset...

But I finally found a good S7 MB. It's quite cryptic signature: Elpina BAE-VO but I guess it looks like a PC-Chips. Chipset has big letters PC100 AGPPro but it's identified as VIA Apollo VP3 82C598AT, better than ALi 😀 It has AT/ATX power, AGP, 3*SDRAM, 1MB L2... It detected Tillamook correctly, allows to set Vcore for 2.1V and VIO hardwired to 3.5V. It runs fine at 85*4MHz and provide much higher memory badwidth to AGP or PCI VGA card. Due to this I got significant speed up in Quake at 640x480 to 21.7FPS. Next possible FSB step is just 100MHz without side steps. The CPU POST at leas with 2.7V but it's not stable even at 2.9V. It boot at DOS but hangs/crash in a secocd when I try to type a command there. On other MBs I hadn't luck at 100MHz too so it seems to be the limit of my piece. Maybe with peltier cooling it could do it but i don't want stress it with high voltage much more... I think it's good result compared to K6-2 500 I got before...

My ppga tillamooks will all do 100x4 does yours not? I haven’t done much testing with the film chip tillamooks. Curious how those overclock

PcBytes wrote on 2024-09-22, 16:32:

The description points to PCChips M577, which is about the only board I know from them with the MVP3 chipset.

You're right! thanks for identification: https://theretroweb.com/motherboards/s/pcchips-m577#bios

Sphere478 wrote on 2024-09-23, 02:17:

My ppga tillamooks will all do 100x4 does yours not? I haven’t done much testing with the film chip tillamooks. Curious how those overclock

Probably not, I have no better explanation, tried at least 2 different MBs that runs fine at 100MHz FSB with K6 but not with my Tilly. Between 83 and 95MHz it requires huge Vcore increase to POST. I already added some caps directly on interposer but didn't help. Maybe they put lower clocking bin CPUs to laptops, I don't know...

Sphere478 wrote on 2024-09-23, 02:17:

My ppga tillamooks will all do 100x4 does yours not?

Damn, don't spring things like that on me, now I gotta be thinking about if I want both my P5A-Bs to be running AMD, and how much it will cost me if not... great and now the little Cyrix guy in my head is saying "What about me, get a 433GP"

I overlooked the FSB option 95MHz (listed in manual but not printed on the MB jumper table).
As on GA-5AA it runs at 380MHz (at least 2,5V to POST) but it's unstable even at 2,9V and cannot finish Quake test (crash after a few seconds of demo). Also vesatest reported me lower graphics throughput 37MB/s (drop from 46MB/s) so I can guess that Quake in 320x200 may run faster but slower in 640x480...
http://rayer.g6.cz/hardware/tillamok.htm#CPU_TEST_TABLE

BitWrangler wrote on 2024-09-23, 23:47:

Sphere478 wrote on 2024-09-23, 02:17:

My ppga tillamooks will all do 100x4 does yours not?

Damn, don't spring things like that on me, now I gotta be thinking about if I want both my P5A-Bs to be running AMD, and how much it will cost me if not... great and now the little Cyrix guy in my head is saying "What about me, get a 433GP"

Watch ebay for 2.0 and 2.2v cyrix chips. 😉 300 mhz FTW

RayeR wrote on 2024-09-24, 04:21:

I overlooked the FSB option 95MHz (listed in manual but not printed on the MB jumper table).
As on GA-5AA it runs at 380MHz (at least 2,5V to POST) but it's unstable even at 2,9V and cannot finish Quake test (crash after a few seconds of demo). Also vesatest reported me lower graphics throughput 37MB/s (drop from 46MB/s) so I can guess that Quake in 320x200 may run faster but slower in 640x480...
http://rayer.g6.cz/hardware/tillamok.htm#CPU_TEST_TABLE

Jeez man, you are gonna cook that poor tillamook.

If it can’t do what you want at 2.2v just leave it be haha.

Those ppga tillys I have will do 400mhz at 1.9-2.1

I just accidentally fried my one and only Tilly when playing with VRM in FIC PA-2005, R.I.P. 🙁
It's over but it was interesting and challenging journey, but there are other projects...

ouch.

if you decide to build another let me know. I really want to see a 300 version. maybe someone can get 4.5 and 5x working. outside of an oem interposer.

I don't have any other source of this CPUs, I just had a luck that I bought one cheap wreck of Compaq Armada laptop. I don' see any cheap enough offer currently on ebay/ali...

RIP...

I have a 300MHz one in a very nice Toshiba laptop but I think that CPU will stay where it is.

RayeR wrote on 2022-09-12, 20:18:

Hi, just an idea...
I got a SL28Q CPU from an old Compaq Armada MB (see here at the bottom of page) http://www.cpu-collection.de/?l0=co&l1=Intel&l2=Pentium+MMX
Not a module but just a bare CPU that was directly soldered on MB. It's very fine pitch quad SMD chip that is pretty useless itself but I'm thinking about reusing it in socket 7 via some interposer board. I know there exist some chinese fake MMX 300MHz CPU that already did the job but seems to be rare. I'd like to know first if someone else didn't try to replicate it with his own interposer. If not, maybe I could design it myself, hoping cheap 4-layer JLCPCB board would be enough to route it all out...

Hello RayeR, I wanted to ask you if there were any diffuculties during desoldering the CPU, because I also want to try to desolder similar CPU and to swap it to another board. I afraid that the core is glued to pcb and it will be nessasery to apply some strength to deattach it from pcb...

Hi, how do you know it's glued? Core is not visible behind the foil. Mine was just soldered, no glue at all. I simply used heatgun and tweezer, just wait enough solder melt and it can freely move I picked it up... But I can imagine they glued the soldered pins like I did on interposer. Then it depends if it is some thermoplastic glue or epoxy that is hard to get off... Good luck, it's very fine operation. In your case you risk a bit of damage the MB in my case I didn't care about it.