More P5B secrets uncovered

[bachus_anonym]

@Tony & FCG,

Here's something for you guys to scratch your head over

I ditched 4:5 ratio and decided to go for 1:1. As you can see, I can Clockgen from 400MHz to 450MHz and beyond that. I should have known better, as 4:5 needs some work anyway. But results are very interesting, don't you think?

Boot @ below (DDR2-533 ratio, 1:1):

420x8        426x8        432x8        444x8        450x8

15:16.391       15:03.422       14:51.141       14:26.969        14:15.218

Boot @ 400x8 (DDR2-533 ratio, 1:1) and raised using ClockGen to:

420x8        426x8        432x8        444x8        450x8

15:27.062       15:12.750       15:00.031       14:34.296        14:24.125

UPDATE1: Another set added, booted at 375x8 and then raised:

Boot @ 375x8 (DDR2-533 ratio, 1:1) and raised using ClockGen to:

420x8                     432x8                     450x8

15:26.140                       15:00.219                        14:24.375

UPDATE2: ...one more set added, booted at 350x8 and then raised:

Boot @ 350x8 (DDR2-533 ratio, 1:1) and raised using ClockGen to:

420x8                     432x8                     450x8

15:26.172                       15:00.547                        System crashed!

No loss in performance here... Even more confusing, better with straight boot

One of my General conclusions is, that dropping multiplier below default appears to be not a good idea and one should aviod that. Higher NB strap or it's internal latencies at higher NBCC or whatever it is that happens, must really impair memory performance. Otherwise, I can't explain how 450x8 DDR2-900 8-3-3-3.0 can be slower than 400x9 DDR2-800 8-4-4-4.0