Are you sure about the DDR2 part? it's the 16 Chip variant correct?

Just want to make sure, because TPU sometimes gets stuff wrong on their database.
I have some notes somewhere on where the memory init script live in the 9000 series bios.. let me see if I can find that this afternoon.

yep 16 chips.

bios header is
"R350 Samsung DDR2 P/N 113-A09402-100 BIOS"

there is an old tool radedit with source available https://sourceforge.net/projects/radedit/postdownload
which is allow to change memory settings DDR>SDR and back. and it does looks like changing something indeed.
but the tool does not know anything about ddr2 ram

RaBit https://www.techpowerup.com/download/rabit-bios-editor/ wouldn't help?

no, i even spoke with author of RaBiT tool and he confirmed it does not have such functionality.
it does detect what kind of memory by parsing bios header -)

Hey dm-,

I didn't get to it today.. I'll be in the lab tomorrow and can check on my notes, I didn't put them into my note app.

I'll also dump 2 bioses:
- Radeon 9600 Pro DDR1
- Radeon 9600 Pro DDR2

And perform a differential analysis on it, perhaps that'll shed some light on it. I'll let you know the results here... helpful or not.

Since the RV350 is effectively a half RV350 and their implementation hardware-wise is very similar, I hope that this will work the same way for the 9800 as well.

i found something changing ddr>sdr using radedit tool.

settings may be found by searching for hex values "12 12 12" but those values on DDR and DDR2 are the same -(
for SDR it will be "12 22 22"

from radedit help documentation:
"
Notes on chip init scripts
Type1:

0A - 0C XX YY 01: XX - mem, YY - core clock, base 2.25Mhz (=27Mhz/12?)
12 - 12 12 ?? ??: Mem timings? 12/12 for DDR, 22/22 for SDR... 23/23 - 8500DV
"