Volt-mod to make memory stable? No option to boost in BIOS.

Hey everyone, I have an old version of the Intel d875pbz board. It doesn't have the option to boost memory voltage in the BIOS. It is static at 2.5v

I've had 2 Geil ultra 400 512's (dual channel) running in there for 6 years with no problems. I recently installed an additional 2 256Mb versions of the same model. They are rated at 2-6-3-3 for 2.55v to 2.95v. Which leaves me 0.05 below the recommended voltage.

I ran memtest86 for 6 and a half hours and got 2 errors on test 5. From my research, this seems to indicate a voltage/timing issue. This wasn't an issue until I installed the two new smaller modules, so I think my motherboard is having trouble supplying enough voltage with 4 sticks installed. EDIT: The two errors occured on the 0 and the 3 DIMM slots

(I've also installed a new power hungry graphics card, but I don't think that would cause trouble when running memtest from a bootable floppy)

So my question is, could anybody help me do a volt-mod to my board? I think just a .05 to .1v increase would be enough to make these work fine.

I have no idea where I would draw with the pencil or place a resistor.

Here are links to a schematic and a picture of my board.

ftp://download.intel.com/design/c [...] 281202.pdf (I had to "save link as" with this pdf)
http://www.thg.ru/mainboard/200307 [...] rd_big.jpg

I just moved the sticks to different channels, hoping that will fix things, and will run memtest again while I'm at work tonight. If that doesn't work, I hope I can do a volt mod so I can keep the factory timings. EDIT: Ran a short memtest repeating test 5, got errors on slots 0 and 3 again.

Any help or suggestions would be appreciated.

There are many posts on the internet explaining how to do it on various motherboards, just not this one.

Also, I edited my original post to show that I'm still getting the errors after switching channels.

After looking at some graphics volt mod faq's, evidently I need to connect the fb and gnd. I'll use a pencil and draw lines till I get something between 2.55 and 2.6.

Is there anything I'm leaving out here?