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Retro Computers >> Hardware PC >> ECS P6S5AT unleashed / SiS 635T @ 166 MHz
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Message started by forteller on 06. Sep 2018 at 15:53

Title: Re: ECS P6S5AT unleashed / SiS 635T @ 166 MHz
Post by VooDooMan on 09. Oct 2022 at 17:03
Na ten moment NIC istotnego nie znalazłem... po za tym że te z 2001 mają nie zaokrąglone rogi no i są na ciemniejszym PCB :)



Płyta leci na 203 MHz:
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OC BIOS:
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Oscyloskop i test dzielnika 1/5
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W załączniku BIOS z opcjami OC do pobrania.


THERE IS ALSO ONE INTERESTING OPTION ADDED  100/150 FSB!
I was wondering how big the increase is when we go from 100/100 to 100/150 FSB.
I think it is a very cool idea for somebody who does not want to overclock their mobo, but still wants to squeeze a little bit more performance from RAM 🙂
These options are excelent for Celeron users on this mobo.
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The gain is not big.... but still better than nothing 😄 Notice one thing: When we set 100/150 FSB using TWO slots of RAM then we CANNOT lower the timings more than to CL 2,5 ( the 2-2-2-6 "works" but is very unstable and looks like this   (You need to Login or Register) so we have to stick to 2,5-2-2-6 I think) - NO MODS APPLIED !



CL2-2-2-6 is possible now but only with PCI graphics card.
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TUTORIAL FOR STABLE 166 MHz with a TUALATIN CPU on ECS P6S5AT

1 BIOS:
- Install the modded OC BIOS created by Antinomy.

2. RAM:
- Look for DDR1 RAM sticks with Qimonda/Infineon (12800CE-5 or 12800CD-5), GoodRAM or Nanya chips. 
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- Avoid any fancy sticks with Samsung TCCD, Winbond BH-5/6 etc. by Samsung, Corsair, Geil,  Crucial, OCZ, TWINmos
- In BIOS try first with CL2,5 NORMAL settings, then go to CL2,5 FAST/ULTRA if stable.

3. CPU:
- Select a tB1 Tualatin CPU that is able to reach 166 MHz without a volt mod (most SL6BW cpus)
- If you have a tB1 capable of 166 MHz but with higher Vcore you need a volt mod or VoltBoard (most SL6BXs and some SL6BYs)
- Almost every Coppermine CPU with CD0 stepping (below 933MHz) will work at a default voltage. You don't need any mods here (just a proper RAM and CPU)

4. MODS:
- CPU VoltMOD (+0,2V)
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- VTT VoltMOD - remove Q36 transistor (forces 1,5V VTT on Tualatin)
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- USE VTTBoard and VoltBoard to omit the first two steps and have full control of the board ;)
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Potential problems:
A) My board doesn't post at 166 MHz with a Tualatin after the VTT mod!!!
1. Make sure your CPU is able to run stable at 166 MHz on a different mobo!
2. Try with different RAM sticks and at lower settings (CL2,5 and NORMAL)

B) My board posts with a Tualatin CPU at 166 MHz but there are lots of errors!!!
1. Increase the Vcore on you CPU.
2. Try with different RAM sticks and at lower settings (CL2,5 and NORMAL).

C) My board posts at 166 MHz but won't log into windows at CL 2-2-2-6 (CL2 and ULTRA)!!!
1. Switch to a PCI graphics card (it won't work with an AGP graphics card).
2. Try with different RAM sticks.


NAJLEPSZE RAMY:
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