MTRR failure revisited (nVidia) 8-STABLE/RELEASE

[Chris H]

Greetings,
 I brought this same error to the list back in May 2009.
Under: failed to set mtrr: invalid argument.
Well, I'm back using the same card:
GeForce4 MX 440-SE - VideoRam 65536 - BusID PCI:1:3:0.
The driver is different, I'm using: nvidia-driver-96.43.13 out of ports on a
custom 8-STABLE kernel. Xorg starts up, and produces a desktop. But it's
"dog slow", and the nvidia driver emits the following error:
NVIDIA: failed to set MTRR 0xf0000000, 0M (write-combining)
several times. I understand John Baldwin provided some "invaluable" help some
time ago: http://lists.freebsd.org/pipermail/freebsd-hackers/2006-June/016995.html
and I was wondering if anyone has gained any further "insight" with these cards,
and how to better "interface" them in BSD. Last I spoke on the topic, I was
informed that the memory was basically "untouchable" - or perhaps in other words;
can't be manipulated. Has this changed? Surely someone else has had to deal with
this besides me. It seems crazy to spend a "boat load" of $$ on these high
performers, and not be able to use them on a high performing OS - no? :)
Sure, the one I'm working with now is "legacy". But I have 3 near new, top of
their line cards, and thus far it appears that if I ever hope to use them, I'll
be forced to... hack, choke.. spin up a WIN CD. :(

Thank you for all your time, consideration, and insight.

--Chris H