This pinmod will work, right?
In light of the recent p3 overclocking threads that have appeared on XS recently, I felt like adding my own.
I have a 5 and a half year old Inspiron 8000. It uses the 815e chipset and is socket 495 aka BGA2. The default fsb is 100mhz, however, the socket's datasheet on Intel's site says that the socket can also handle a 133 bus, even though no CPUs with that bus were made.
This mod is made a lot more difficult because both BSEL pins need voltage. To get BSEL1 to be 1, I can connect it to VCC right? I've never heard of connecting pins to VCC in pinmods before. The pentium m guides only talk about connecting pins to ground, even for the voltmods. I'm not sure if they never mention using VCC because it flat out won't work because there needs to be a resistor or something, or if the VCC pins are annoyingly far away from the BSEL and VID pins.
That's BSEL1 connected to the nearest VCC. I'm pretty nervous about this because the wire will pass right by a VSS (ground). Will coating the wire in nail polish and wrapping a little tape around it be enough to prevent a short? I'm not really worried about wrecking the CPU because I'll first test this on a 700mHz cC0. With CPUFSB I've made it run at 840, but there are no options higher than that (that's why I want to do the mod). The 1gHz cD0 that runs 100% stable at 1.2gHz with a mere 1.7V is My Precious. Still, if I short the slower CPU I think I could fry the motherboard.
I think it can handle the extra heat. I can easily put the faster CPU at 1.8, 1.9, and 2.0 volts, but I think the temps will be too high above 1.8. .05 increments will require VCC connections. The slower one can easly be set at anything, and it's default is 1.65V.
It'd be sweet to get a coppermine running at 1.33 in a laptop. If you guys think I'll just end up frying the thing or have any suggestions please let me know.
It has PC133 ram, but the BIOS seems to ignore the SPD and runs the ram at 2-2-2-5 instead of 2-2-2-6. This could be a nice bonus if the mod works, but if it doesn't this could be really bad. Memset doesn't support anything older than 845 chipsets, so I have to cross my fingers on this.
Here's the whole PDF if anyone wants it.
Last edited by Khenglish; 11-14-2006 at 06:28 PM.
Just insulate both BSEL pins (pull them out or similiar) - or well if it's at 100 by def you just need to insulate bsel:1
It didn't work. I ended up braking off both BSEL pins on the older CPU and the bus never changed. It looks like the board doesn't even check the BSEL pins.
At least I did a better AS5 job when I put the faster CPU back in, so it wasn't quite all for nothing.