According to HP, I was wrong -- it's not an i945GM, it's an i945GT. TinyURL'd linky (rather than pasting in a paragraph-long URL) --> http://tinyurl.com/pwdfxbarg66 wrote:@ starhawk
As luck would have it my windows comp has an Intel i945 chip set with 4GB of RAM so I tried a few different puppies on it.
Intel G41 chip set and X-slacko-2.1 - 4GB RAM
i945 with X-slacko-2.1 - 3.36Gb RAM
i945 with Carolina-1.2 - 3.36GB RAM
i945 with slacko-5.7.0 - 3.36GB RAM
Looks like a chip set limitation. A Google search for "i945 ram limitation" confirms this.
Edit: Windows 7 64 bit on the i945, 4GB total 3.24GB usable
The RAM limit is an odd thing to hear about -- the official datasheet for the i945 family (big PDF warning) lists the following information on page 23 (regarding the GM and GME variants specifically) --
...and the following, on page 27 (regarding the GT variant) --• Maximum Memory supported: up to 4 GB at 400, 533 and 667 MHz
There is no entry below that for RAM.All features supported by the Mobile Intel 945GM/945GME Express Chipset shall be supported by the Intel 945GT Express Chipset unless otherwise noted. Additional features/differences are also listed here, if applicable.
Note: The Intel 945GT Express Chipset is targeted for use in desktop designs.
Further, for the i945GM, Intel's ARK page lists 4GB maximum memory capacity, with 32-bit PAE compatibility. See here --> http://ark.intel.com/products/27857/Int ... Controller
Intel seems to have disowned the -GT version, I can't seem to find a reference to it anywhere on their site. Very strange...
For what it's worth, I've got a replacement heatsink and fan on my board's northbridge (the actual chip in question) since HP intended a different thermal solution from what I ended up implementing -- I don't mind pulling that heatsink briefly to get a look at exactly what chip is under it.
OTOH, look at this here (third post from top) --> https://forum-en.msi.com/index.php?topic=123711.0
That seems to support what you're reporting. I'll never use the PCI slot in this thing (well, PCI Express x16 slot, actually) so I'll take a look around the BIOS to see what I can do here.