PIRATA!
05-11-2004, 04:04 AM
Hi!
I have made the VDimm mod to a P4C800 according to Malves (http://www.malvescorner.com/) instructions, but after less then 1h, the mod seemed to be not working.
Let me explain.
I have made the mod using a 50k trimmer soldering it to the IC PIN shown of Malves site and to a generic ground of the mobo (a screw hole).
After the mod, I have misured VDimm and VTT with success. VTT was exactly the half of VDimm at any VDimm setting.
I have setted the trimmer to have at max 3.15V (2.85V in bios).
After these settings, I have setted up my system for benchmark. My hardware is:
P4 2.4 800 FSB stable @ 283MHz (really stable and more @ 1.55V)
2x 256MB Mushkin PC3500 Level2 @ 230MHz @ CAS 2.0 2-2-5
This stuff is supposed to go @ 5:4 (283:226) @ CAS 2.0 2-2-5. Now here comes the fact:
After some Super-Pi and 3DMarks, I could assume that there was now whay to have a stable system, not even disabling the Performance Mode for the CPU and the Memory Accelleration Mode and ICH Delayed Transiction for the Ram. is some cases I was not able even to boot up the system.
I have tryed also to move and invert the ram in other position (always in position 1-3 or 2-4), but with no success.
I know that this system can go @ that frequency because I have tryed on a modded IC7-MAX3 with success.
Just after one of these ram changes, I had a bad boot up, and for a while I weas not able to boot at all.
I got even a Bad Bios Error, asking me for a floppy or cd with on the new correct bios.
I hade to reflash the bios a coupple of time before the mobo could start again.
After all this I went to read with a multimeter all mobo voltages again to try to find the problem, and I could realize that they where all bad!!
The VDimm was @ 2.85, same as bios setting, like if the mod was not even installed.
VTT was the half of the bios setting.
VAgp was 1.86V and it was like that with any bios setting.
I tryed to boot up the mobo a coupple of times just to see if I was a boot/bios problem, but I got other bios error asking me for reflashing and other strange boot signals.
Some times rebooting the mobo after the bios error, the mobo restarted correctly.
I have tryed even to flash last bios, but with no sucess.
I the decided to remove the VDimm mod, but the voltages were the same (VDimm, VTT and even VAgp!!).
I decided then to change the mobo and to get a new P4C800.
Now I have the new one but I am really afraid to mod it again with the VDimm mod. I need that mod to reach my preferred oc, but I just can understand what havvened with the old mobo.
Can some one please help me??
Thank you very much. ;)
I have made the VDimm mod to a P4C800 according to Malves (http://www.malvescorner.com/) instructions, but after less then 1h, the mod seemed to be not working.
Let me explain.
I have made the mod using a 50k trimmer soldering it to the IC PIN shown of Malves site and to a generic ground of the mobo (a screw hole).
After the mod, I have misured VDimm and VTT with success. VTT was exactly the half of VDimm at any VDimm setting.
I have setted the trimmer to have at max 3.15V (2.85V in bios).
After these settings, I have setted up my system for benchmark. My hardware is:
P4 2.4 800 FSB stable @ 283MHz (really stable and more @ 1.55V)
2x 256MB Mushkin PC3500 Level2 @ 230MHz @ CAS 2.0 2-2-5
This stuff is supposed to go @ 5:4 (283:226) @ CAS 2.0 2-2-5. Now here comes the fact:
After some Super-Pi and 3DMarks, I could assume that there was now whay to have a stable system, not even disabling the Performance Mode for the CPU and the Memory Accelleration Mode and ICH Delayed Transiction for the Ram. is some cases I was not able even to boot up the system.
I have tryed also to move and invert the ram in other position (always in position 1-3 or 2-4), but with no success.
I know that this system can go @ that frequency because I have tryed on a modded IC7-MAX3 with success.
Just after one of these ram changes, I had a bad boot up, and for a while I weas not able to boot at all.
I got even a Bad Bios Error, asking me for a floppy or cd with on the new correct bios.
I hade to reflash the bios a coupple of time before the mobo could start again.
After all this I went to read with a multimeter all mobo voltages again to try to find the problem, and I could realize that they where all bad!!
The VDimm was @ 2.85, same as bios setting, like if the mod was not even installed.
VTT was the half of the bios setting.
VAgp was 1.86V and it was like that with any bios setting.
I tryed to boot up the mobo a coupple of times just to see if I was a boot/bios problem, but I got other bios error asking me for reflashing and other strange boot signals.
Some times rebooting the mobo after the bios error, the mobo restarted correctly.
I have tryed even to flash last bios, but with no sucess.
I the decided to remove the VDimm mod, but the voltages were the same (VDimm, VTT and even VAgp!!).
I decided then to change the mobo and to get a new P4C800.
Now I have the new one but I am really afraid to mod it again with the VDimm mod. I need that mod to reach my preferred oc, but I just can understand what havvened with the old mobo.
Can some one please help me??
Thank you very much. ;)