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I have another machine thats a Pentium MMX and runs at 166 MHz. I want to overclock it, but I don't know my options. Could someone provide specifics as to the range I can overclock in? And although I have an "active heatsink" I don't want to push the CPU too far to the point of over-heating. Another question; will I have to modify anything in the BIOS or anything related to my RAM settings?
I need to know which jumpers to move and where so here are URLs to images of the jumpers and jumper menus:
CPU Core Voltage Settings - http://img209.exs.cx/img209/8647/dsc012566ha.jpg
CPU Clock Settings - http://img209.exs.cx/img209/702/dsc012688ut.jpgThanks in advance.
It's highly unlikely you're gonna overheat an old P1 MMX. They're nothing like the "mini-furnace" CPUs of today.
You show the multiplier settings & the vcore, but not the FSB. We can't give you any advice without know what RAM you have & what FSB choices you have.
The default voltage for an MMX is 2.8v. Most 166MMX will run at 200MHz without a problem, & many will run at 233Mhz. But if you expect to see a significant difference in performance, you'll need to run at the highest FSB possible. 2 x 100 is faster than 3 x 66.
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro
0 
Thanks.
Eeeh...sorry. I've got 2 slots of ram totaling 32 MB and another 2 slots with 2 EDO RAM sticks.I guess this is what you needed?
http://img128.exs.cx/img128/7707/dsc012707jr.jpgI'm not familiar with the setting of jumpers so I'll need dumbed-down instructions on which ones I need to move and where.
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Well, that tells the tell...your max FSB setting is 75MHz. EDO RAM will handle that no problem, but your PCI speed is gonna increase to 37.5MHz. That may or may not be a problem - it depends on the quality of your hardware.
Try clocking your CPU at 2.5 x 75 (187.5MHz), or possibly 3.0 x 75MHz (225MHz). A voltage increase "may" be necessary to stabilize at 225MHz. It shouldn't be necessary at 187.5MHz.
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro
0
And how would I go about modifying the PCI speed? BIOS?
Also...IF I shoot for 225 and increased volatge be necessary, would 2.9 or 3.0 cover it?
Last question...:) do I need to change around the FSB jumpers? If so which and how?
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jam is quite correct about the overheating issue, back then passive cooling (heatsinks without fans) was the norm. I still have a couple of those systems in the attic.
Pentium with MMX technology featured Intel's final collection of processors (166Mhz, 200Mhz, 233MHz) for Socket 7 mainboards, unremarkably the difference between these CPU lies in their default multiplier.
Pentium w/ MMX 166MHz (66x2.5) - 2.8v/3.3v
Pentium w/ MMX 200MHz (66x3.0) - 2.8v/3.3v
Pentium w/ MMX 233MHz (66x3.5) - 2.8v/3.3vHowever the first problem you may run into depends on how old the processor is, because Intel smartly began to lock later 166MHz batches to a multiplier of 2.5x to deter people from simply buying a 166Mhz and overclocking it to 200Mhz or higher.
B4 you criticize a bigger man, walk a mile in his shoes. That way, you're a mile away, and you have his shoes.
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1. You can't modify the PCI speed - that was my point. When you increase the FSB, the CPU speed will increase along with it.
2. Try it at 2.8v 1st - if it doesn't boot at all, or you have problems in Windows, try it at 2.9v. I wouldn't go higher than 3.0v. If you still have problems at 3.0v, drop back to 2.8v & reclock the CPU to 187.5MHz
3. The FSB table is a little unclear. Find the 3 jumpers labelled FS0, FS1, FS2. Each will have 3 pins & they should be somehow numbered, 1, 2, 3. There may just be a number 1, obviously the next pin would be 2, the next, 3. For 75MHz FSB, the 3 jumper caps should be placed as follows:
FS0 = cap on pins 2-3
FS1 = cap on pins 1-2
FS2 = cap on pins 2-3I'm fairly sure your board doesn't have temp readings in the BIOS, so you might wanna try the unscientific method of touching the heatsink. Run your system at 166MHz for a while, then shutdown & quickly feel the heatsink. That'll give you an idea of how hot it normally is. Then after you overclock, run it for a while & do the same thing to see if it's hotter or not.
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro
0
Heya! I had my old 200Mhz MMX at 233Mhz on
an old Packardbell mobo, so you should be
able to get around about that with a decent
motherboard. I think it was running at 2.8v
but I can't remember ... it only gives me a
choice between STD VR and VRE on the voltage
jumpers ... so I can't tell ATM but I might
get it running again just to see ... ;)Here are the FSB and mutliplier jumper
settings drom that board :FSB:
"CLOCK
Freq | Jumper 'C'
60 | RSVD | 4-5
66 | RSVD | 5-6"Multiplier:
"BUS FREQ
Mult | Jumper 'D'
1.5x | 1-2 | 4-5
2.0x | 2-3 | 4-5
2.5x | 2-3 | 5-6
3.0x | 1-2 | 5-6"This is actually printed on the mobo, along
with "233Mhz = 1.5x,66mhz" which (I guess)
means that the board detects that itself,
somehow ... well it worked for me lol!Hope that sketchy info helped!
Zee.
AMD Athlon 2800+ barton @ 12.5 X 176 : 2200mhz
512Mb Corsair RAM
MSI KT6 Delta mobo
Leadtek AGP 6600 gt 128Mb
120Gb Seagate HDD
0
^ Sorry, I didn't realise Jam had sorted
out the jumper configurations for youZee.
AMD Athlon 2800+ barton @ 12.5 X 176 : 2200mhz
512Mb Corsair RAM
MSI KT6 Delta mobo
Leadtek AGP 6600 gt 128Mb
120Gb Seagate HDD
0
Thanks guys, I had trouble figuring out the FSB table.
I tried the 225 MHz clocking, but at boot it says 150 MHz?
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Maybe you nned to change the multiplier setting to 3x for that speed. But I suggest you start the lower settings first because if there is a problem with your cpu starting with the highest setting may damage it.
Another possiple reason maybe that your bios can't read the speed properly. download CPUZ and run it in your windows to chack that!
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CPU-Z Report
CPU-Z version 1.26.CPU(s)
Number of CPUs 1
Name Intel Pentium MMX
Code Name P55
Specification Intel Pentium MMX
Family / Model / Stepping 5 4 3
Extended Family / Model 0 0
Package Socket 7
Technology 0.35 ยต
Supported Instructions Sets MMX
CPU Clock Speed 149.7 MHz
L1 Data Cache 16 KBytes, 4-way set associative, 32 Bytes line size
L1 Instruction Cache 16 KBytes, 4-way set associative, 32 Bytes line size
Mainboard and chipset
BIOS vendor
BIOS revision
BIOS release date
Chipset Intel i430TX rev. 1
Southbridge Intel 82371 (PIIX4) rev. 1
Cache Memory 512 Kb
Memory
DRAM Type 512 Kb
DRAM Size 32 MBytes
Software
Windows version Microsoft Windows 98 SE
DirectX version 8.1I have the set jumpers to this when I get the 150 MHz:
FS0 - 23
FS1 - 12
FS2 - 23JP3 - Open
JP4 - Short (Closed)
JP16 - Open
0
Read your motherboard manual, if you've kept it and see what it says about jumper settings.(by jboy - lol) It's usually also printed on the motherboard. Look around for minicharts and stuff. Because different motherboards have different jumper settings, we can't directly point it out.
There are two types of people in this world: lazy people and stupid people.
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I was hoping this wouldn't happen, but it looks like you have one of the locked 166MMX CPUs that Sabertooth mentioned. I'm not sure, but I think just the 3.0x multiplier was disabled.
You'll definitely be able to run at 187.5MHz (2.5 x 75), & "may" be able to run at 233MHz (3.5 x 66). If the 3.5x multiplier works, you have nothing to lose by trying it at 262.5MHz (3.5 x 75)
http://www.hwupgrade.com/overclock/cpu/index8.html
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro
0
I'm confused, the multiplier menu table has the same jumper settings for 1.5x & 3.5x?
http://img209.exs.cx/img209/702/dsc012688ut.jpgI tried it with "Open Open Open" (1.5/3.5x) for the clock jumpers and set the FSB to 66. Once I turn on the machine I get a weird CMOS error message at boot and 166 MHz shows up. Is there no way to bypass the lock?
The 187.5 Mhz clocking worked by the way.
0
No, there's no way to bypass the lock. Looks like 187.5 is the best you're gonna do
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro
0
Thanks for all the help, really.
One final, last, closing question. I swear.
I've got an old Pentium 166 CPU lying around, and since the P166 has no overclocking lock...would a P166 overclocked ~233 MHz perform better than the MMX at 187? I'm not really sure because the MMX instructions are already supposed to boost performance with media.
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It may not, MMX represents a new multimedia enhancement technology and Pentiums with MMX performs 10-20% faster than Pentiums with the same clock speed. It was based on the analysis of where codes reside most of the time.
Generally, 10% of codes are multimedia-based. Nevertheless, since most of it uses repetitive loops, they use up 90% of execution time. The 57 new instruction is made to execute and handle these codes efficiently.
MMX incorporates a process called Single Instruction Multiple Data (SIMD) which enables one instruction to perform the same function on multiple pieces of data. MMX also utilises a 64bit register (from the floating point architectures already build in Intel architectures).
Lastly there is an increased 32-bit on-chip cache, on Pentium with MMX, which enables less RAM & off-chip memory access.
B4 you criticize a bigger man, walk a mile in his shoes. That way, you're a mile away, and you have his shoes.
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Guys, please help me. I don't know anything about overclocking but I want to overclock my old pentium mmx wich runs at 166 mhz. I know that I have to change multiplier but I don't know were and how. I'm sorry for my bad english. I hope that that wont be a problem.
Thanks
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