Memory Timing Evaluation Tools

[Magister]

Hi all.
We recently replaced the RAM in a number of machines.
Originally each of 14 machines had a single OEM 256MB PC2700 DIMM.
We replaced them with a single 512 MB PC2700 DIMM made by Kingston.

We did this because of intermittent instability experienced.
The situation did not improve, and may even have grown worse.

I'd like to experiment with the memory timings, on the hypothesis that the MB timings are less than optimum.

Are there tools I can use to evaluate memory timings?
I use Memtest 86+ v1.70 to test the RAM -- is that sufficient?

What is standard methodology for investigating RAM timing?
I've generally always pretty much gone with whatever the BIOS determines is best.

I know that this is only one possible cause, and we will be testing others, such as :
Is Power supply under spec?
Does MB BIOS FW need u/g?
Does MB chipset driver need u/g (apparently not)

But for the purposes of this thead, I'm just pursuing the RAM timing issue.

TIA,
Magister