F2-8500cl5d-4gbpk + ma790x-ud3p

[frank83]

Hello,

i cant run this combo at 1066mhz and i know thats a common problem, i tried almost any solution i could find in this forum but i just cant run them stable, so help would be really appreciated.

CPU: Phenom II X4 920 (2,8ghz), by the way...

what i tried so far:
- DDR2-Vol at 2.1, 2.0, 1.9, 1.8
- NB-Vol at 1.4, 1.2, 1.1
- SB-Vol at 1.4, 1.2
- tried loose timings (6-6-6-18)
- of course the correct timings too
- tried increasing the tREF (if thats right) from 127.5 to 195
- tried increasing the Row Cycle Time
- asked gigabyte for help, recevied new beta-bios
- sent back ram and received new
- sent back mainboard and received new

NOTHING WAS STABLE

i noticed that the EPP-profile (with memset) says tWR at 13 but i can only set it to 8 max,
same with the tRC EPP:48 maxinbios:42
And in the official memory-support-list from gigabyte for this board exactly this ram-kit (@1066) was tested successfully

i have no idea what to do next (running currently at 800 with 4-4-4-12, stable)
thanks for any help

PS: oh i almost forgot the strangest thing about this:
my friend bought the exact same configuration, has the same problems and sent back his ram-kit, too.
the strange part is that 1 stick out of each 4 kits we tried where unstable when tested with only 1 stick

[RamJam]

might try at 5-5-5-15, command rate at 2T, DRAM Voltage at 2.1, tRFC at 127.5, NB at 1.2

[frank83]

First of all: thanks for the answer!

but i tried that already and had the command rate always at 2T

[Tradesman]

Couple of ideas, do you have the latest BIOS, also might try giving the CPU a slight OC or feeding it a bit more voltage, AMD has long had problems with RAM at 1066 or higher, their CPUs have (technically speaking) a relatively weak Memory Controller and unfortunately they don't put alot into R&D to improve them.