Memory suggestions Gigabyte EP45-DS3L (DDR2 1333 / 1200 ???)

Ok, after all that **** with memtest 3.5, I'll be using memtest86+ 2.11
from now on.

What I've been testing so far are these:

Kingston KHX8500D2K2/4G

Kingston specs are 5-5-5-15 @ 2.2V, but they run really hot. I didn't
take them above 2.0v. I found it was stable at 6-6-6-16 at 1066mhz
(memory clock at 533 mhz) at 1.9v. I tried running it at 1110 mhz at
2.0v but it failed memtest 2.11 consistently at about the 35% part of
pass 1. Running at 1066, memtest reports 4226 mb/sec (single channel)
and 5425 mb/sec (dual channel).

Corsair Twin2X4096-8500C

Specs printed on the dimms say 7-7-7-20, 2.0v, 1066 mhz. I found it
stable at 6-6-6-16 at 2.0v running 1110 mhz. Memtest
reports 4385 mb/s (single channel). Haven't tried them in dual channel.

I'd have to give the edge to Corsair in this comparison.

This again is on a Gigabyte EP45-DS3L with Intel Q8200 (Core2 Quad
SLB5M) 2.33 GHz (clock multiplier 333 MHz x 7).

My next test won't be for another day or two. I will try the OCZ
fatality again, and try a full 8gb of ram.

Does anyone mess around with the pages and pages of additional bios ram
settings? Is there any pattern or proceedure for setting those? Should
I even bother?

Does anyone maintains a list of memtest speed charts or tables? There
are lots of performance numbers out there that the various publications
resort to, but I don't think I've seen any of them use the raw mb/sec
numbers from memtest86.

Why on earth did the industry migrate from DDR to DDR2 and now to DDR3
if there are really no performance benefits from all these new ram
versions - especially the transition from DDR2 to DDR3 ?