Anyone up for some tREF discussion?

Soldato
Joined
18 Oct 2002
Posts
6,669
Been playing around with tREF on my system in sig.

With the memory @ 250 Mhz @ 2-2-2, 1T, 200 divider, I got the following graph:

EDIT - Yellow line shows 2GB OCZ @ 213 Mhz.

tref.jpg


As you can see, a clear relationship between tREF and errors, and a slight reduction in bandwidth @ low tREFs.

My questions are:

Is the ideal tREF specific to the RAM?
Is it specific to the memclock?
Is it specific to the divider?

From previous discussions, I'm quite a fan of the following:

ideal tREF = refresh rate / (1/clockspeed)

The problem is that there is so much mis-information about tREF about, and that table showing tREFs grouped into refresh rates (3.9, 7.8, 15.6 us) and clockspeeds (100 - 200 Mhz) only confuses things. Don't even get me started on Dracula's tREF tables . :confused:

Does anyone have any simple theory on tREF?

At least Dracula's four best and four worst tREFs bear some resemblance to my findings:

Four best =

* 1560
* 3072
* 3120
* 4708

Four worst =

* 0016
* 0032
* 0064
* 0128


My four best (1GB BH5) =

* 3684
* 3072
* 4708
* 4196

EDIT - My four best (2GB OCZ) =

* 2336
* 2048
* 2560
* 1536

I can only assume higher tREF = better, but knowing that the memory must be refreshed to keep the data 'alive', a higher tREF could also result in data loss...
 
Last edited:
Soldato
OP
Joined
18 Oct 2002
Posts
6,669
Minstadave said:
looks like you've been working hard on this :)

I was bored after having to RMA my new 2GB RAM, so I thought a hungover day of tinkering with BIOS settings and running memtest while listening to music and snacking would be just what the doctor ordered :D
 
Soldato
Joined
12 Sep 2003
Posts
10,002
Location
Newcastle, UK
Jimbo Mahoney said:
I was bored after having to RMA my new 2GB RAM, so I thought a hungover day of tinkering with BIOS settings and running memtest while listening to music and snacking would be just what the doctor ordered :D

Ahhh yes, we've all been there before. :p
 
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