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Home / Web Pads / Panasonic CF-01 Overclocking the CF-01 I know, *that* old subject....

Overclocking the CF-01 (modified 0 times) JamesW Profile From the pages linked off http://members.iquest.net/~rec/intel_alt/ : Am5x86 Tech Specs 133 MHz internal clock 33 MHz bus speed 4x clock multiplier 486 motherboard (168-pin PGA; 208-pin SQFP) 16K unified write-back cache Notes: The Am5x86 is essentially a clock-quadrupled 486 processor. The performance increase is gained almost completely through higher clock rate, with relatively few architectural differences. Performance P-Rating: P75. Overclocking 133MHz to 150MHz (3x50MHz) -- Reports on newsgroups indicate that this is possible, but I have not received email from anyone who claims to have done it. Note that some cards cannot support 50MHz operation, so this could cause problems. 133MHz to 160MHz (4x40MHz) -- Not only is this possible, but it seems to be very popular. In fact, everyone who's emailed me about this chip claims to have overclocked it to 160MHz without problems. They report performance in the range of a P90 04-18-2001 00:23:37

RE:Overclocking the CF-01 (modified 0 times) Groch Profile | Email Awesome!!! Now lets talk case mods so I can get my Alpha cooler on that sucker. 04-18-2001 05:01:32

RE:Overclocking the CF-01 (modified 0 times) Glitch Profile Of course, overclocking will depend entirely on the motherboards capability to increase the bus speed. I would be very surprised if the bus speed can be changed (or easily modified). The nature of the device lends itself to a very rigid architecture. I hope I'm wrong about this. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-18-2001 07:08:23

RE:Overclocking the CF-01 (modified 0 times) cfoxga Profile If bus speed is an issue, why not bump the clock multiplier up to 5 (assuming it can go that high). 5x33 = 166, which should be more stable since the processor can handle 160 and the bus speed is unchanged... Chris 04-18-2001 11:34:30

RE:Overclocking the CF-01 (modified 0 times) Linuxguru Profile | Email It's highly unlikely that either the multiplier or the clock can be changed on this unit. The max multiplier is 4x on the AMD 5x86/133. The clock can go as high as 50 MHz, but this will require very careful SMT desoldering / resoldering, even assuming the correct crystal(s) can be found. It's unlikely that the rest of the system will work stably at 40 MHz, leave alone 50 MHz. In short, forget about overclocking. BTW, I've easily overclocked the desktop 5x86/133 to 3 x 50 = 150 MHz (the motherboard supported a bus clock of 50 MHz). 04-19-2001 18:05:51

RE:Overclocking the CF-01 (modified 0 times) tcbordp Profile You might want to look at the overclocking done on both the Toshiba Libretto and the IBM PC110 to see that anything is possible, and not even necessarily hard. It will involve small scale soldering but probably not a crsytal change, usually just a couple jumpers to the clock generator to get a new divisor. As far as the rest of it running at 50Mhz it would probably do fine since the components are not that old so their specs are probably overly generous for the current design. The pc110, a 496 based machine, is relatively easily overclocked from 33Mhz to 40Mhz with the only difference being a slight decrease in battery life. We just need someone that wants to decipher the clock generator pinout to see what can be done. PeteB 04-19-2001 19:23:50

RE:Overclocking the CF-01 (modified 0 times) Glitch Profile At least the clock generator has a "real" part number so there is some hope. The data sheet can be found here: http://www.cypress.com/pub/datasheets/cy2291.pdf It looks like this device can be programmed for three different frequencies. The next step is to determine which frequencies that Panasonic programmed into them. There is also a way of "field programming" the frequencies into EPROM. I'm not sure of the caveats associated with doing this. I'm guessing at the very least the chip would have to be removed from the CF-01 to be reprogrammed. There may also be the option of getting replacements with our choice of frequencies (i.e. faster ones). It is still way too early to tell if overclocking is a possibility. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-19-2001 20:42:19

RE:Overclocking the CF-01 (modified 0 times) mfkap Profile Has anyone thought of throwing an intel 486 DX4 in there? I know that a lot of the talk here has to do with poor FPU on the AMD. Does anyone know if an intel 486 DX4/100 would be any better than this CPU? I do not have the unit yet, and am not sure I know enough even if I did, but I am thinking that this might be an alternative. Any thoughts? mfkap 04-27-2001 07:30:51

RE:Overclocking the CF-01 (modified 0 times) Glitch Profile mfkap: The CPU is not socketed. It would be a major pain to replace the chip. I don't think that it would matter anyway. AFAIK, the AM5x86 was the "king" of the 486's. Just to head this one off at the pass... None of the "overdrive" options will work due to a lack of a socket. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-27-2001 09:37:36

RE:Overclocking the CF-01 (modified 0 times) mfkap Profile I guess that answers that one. My only thought was that a 100 w/Intel FPU would be better than the 133 w/AMD FPU. I guess since there is no socket, you would have to be a very brave soul to attempt this one. Oh well... still on my mission to get a decent car computer out of this one. mfkap 04-27-2001 11:50:11

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