Tref values

[Agent-Sharp]

Hello,

I am Sharp from the DFi forums, Someone has taken my name here
Agent-Sharp is my alternative.

I have some questions too about the tREF values.
Since having my DFI board I have questioned the original tREF table post #46.
The values do not make any sense and it would be really good if the person that made it could explain it.

And the values shown in A64 Tweaker are odd too.

My favourite memory benchmark utility has helped a bit but still the program is not 100% accurate.

RMMA - Rightmark memory analyser.
This program will show you the refresh rate.

Using RMMA I have tested some of the values in the BIOS and they do match the calculation but there are a few unexpected results.

http://cpu.rightmark.org/download.shtml

Here are my findings so far. (I have screenshots if anyone wants too see but try it for yourself too.)

RMMA Results, (Anyone not understand this?)
==============BIOS==RMMA==========
5ns/200Mhz.........3120 = 15.6...cal confirms
5ns/200Mhz.........1560 = 7.8....cal confirms
5ns/200Mhz.........780 = 3.9.....cal confirms
5ns/200Mhz.........388 = 3.9.....expected 1.95
5ns/200Mhz.........016 = 3.9.....expected 0.08

10ns/100Mhz........3120 = 15.6...weird
10ns/100Mhz........1560 = 7.8....weird
10ns/100Mhz........780 = 3.9.....weird

7.5ns/133Mhz.......2064 = 15.6...cal confirms***
7.5ns/133Mhz.......1032 = 7.8....cal confirms
7.5ns/133Mhz.......516 = 3.9.....cal confirms

6ns/166Mhz.........2592 = 15.6...cal confirms
6ns/166Mhz.........1296 = 7.8....cal confirms
6ns/166Mhz.........648 = 3.9.....cal confirms


***Notice there are 2 2064 values in the BIOS.

Top one was used above and it came out as expected.
When I used the bottom 2064 value it came out wrong.

Bottom 2064 x 7.5ns/133Mhz = 7.8us?

END=======================

What I have to say about RMMA.
- The program does not seem to display actual values and it rounds to either 3.9/7.8/15.6

- Using 200Mhz/5ns and max tREF cycles in the BIOS RMMA displayed N/A
- Using 200Mhz/5ns and 0016 RMMA displayed 3.9us.
- And it did not work for 100Mhz.

So it is hard to measure all the values but (big but), when changing the frequency and using calculated values for 3.9/7.8/15.6 RMMA always confirmed the results.

I am still not happy with the results but it is much closer than anything else that I have seen.

Also I would have tested over 200Mhz but my power supply will not allow me to OC. (20pin).

RMMA did not work for 100Mhz so will it work for anything over 200Mhz?


Maybe someone can contact RMMA and ask about all of this?


I would be grateful if everyone (as many as possible) could test this with RMMA (confirm my results and go beyond) as I may have made some mistakes.

Also I would like say thanks to everyone for sharing their results/findings.