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Is possible to downclock 1200 MHz CPU to 300 MHz or even 100MHz?

post #1 of 10
Thread Starter 
Hi!

I'm here newbie.
Really it's first time when I'm trying to do something with clocking.

What and why?
I'm retro computer user and programmer and I was using PC FAT32 filesystem as storage for Commodore 128.
Software written for this task can work in MS-DOS or 16-bit Windows, can cooperate with Windows 95 (we know it's DOS based OS).
Problem is not in OS, problem is with clocking.
My old good 486SX is corrupted by hardware failure.
In one week I will have at home PC with 1200 MHz (or 1,2 GHz) CPU - currently don't know exact model and brand (Intel or AMD).
Software, for short 64HDD, can to work at 100 MHz or less, is tolerant to 300 MHz, but not more.
I know that's easy to buy old retro PC, but when I will have this PC, I'll use it also for currently not supported software or tests of my software and many others which is for retro PC impossible.
I want to run on full speed Windows 2000, Commodore OS 1.3 (Linux Mint).
On downclocked CPU I want to run MS-DOS 6.22 and Windows 3.11 WFW with 64HDD.

So, now you know why and now Q what:
Is possible to downclock 1,2 GHz x86 CPU to 300 MHz or even 100MHz? And also this downclocking switch by any way?

Thank you for each info, suggestions, help. Always is everything useful.
Miro
post #2 of 10
If the Bios is not locked then I don't see why not.

Like you, I want to play some of the old games as well. For best results I also suggest going to GOG and downloading some of your good old games favorites for cheap. You know that those games will work on modern hardware as well.
 
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BitoHeaven
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Cigar ATX PC
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CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
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BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
Viewsonic 19” Flatscreen CRT Gigabyte GK-K6800 103  Thermaltake TR2 600W Cigar Boxes 
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post #3 of 10
I think underclocking and undervolting is similar to overclocking and overvolting. You still need to get the balance right for stability.
post #4 of 10
Thread Starter 
Ok, I know I'm beginner, but somewhere must everybody begin.

So, how to begin and where to go, or recommended webs, resources? Or can I ask here directly?

To retrocomputing:
It's maybe strange, but I'm using retro computers for system software...

Miro
post #5 of 10
Thread Starter 
So how to begin?
Miro
post #6 of 10
It depends on the system really, what options are unlocked and can be changed, what kind of cpu will it be. There is a 486 emulator on the net you may want to also try that

Found a link.

http://bochs.sourceforge.net/
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post #7 of 10
What do you need to go to 300MHz on modern hardware ?
A 50MHz BCLK/FSB capable MB, and a CPU with multiplier of 6 or less.
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post #8 of 10
Thread Starter 
It's not modern hardware ~15 years old computer.
Why I want to downclock is written above...

Miro
post #9 of 10
Thread Starter 
So, now I have computer at home.
It's old computer, but a beast - it has Celeron x86 at 3,2 GHz...

So, Q is now other - how to downclock 3200 MHz CPU to at least 400 (divided by 8) ?

I'm not sure if is it possible, here's AIDA64 report http://www.mirkosoft.sk/aida64report.html

Thank you all for help.

Miro
post #10 of 10
You want to purchase an aftermarket motherboard. That OEM board is locked, so you'd have to try software and you probably won't have any fun. So the easiest route would be to purchase a motherboard that supports overclocking so that you could underclock to a specified speed for the cpu. Most processors will let you lower the cpu multiplier greatly so long the bios supports overclocking.

If you have software that runs in DOS, you can still run W10 or W7 and get a program like DosBox http://www.dosbox.com/download.php?main=1 Then you could use any PC you wanted and not bother with old hardware.

With s775 and running W95 and lower, you will have to install ALL of the drivers in order to use the PC with your older programs. I'm not sure about Operating system support for s775.

If you wanted a slow PC, you would have searched for maybe socket A from AMD. Then you'd have some good fun with a system that could do 300mhz clock speeds with little trouble. Again you want to find a NON OEM motherboard that has overclocking features. Any how socket A was released around the time of W2000, so drivers won't be so hard to come by.

Any how it was interesting seeing the title to this post greatly differ from the hardware you actually have. Couple generations of sockets no less. If that motherboard supports Core 2, you do have a fast PC from it's time wink.gif
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