Загружаетесь с одной, ставите тайминги самые высокие из двух планок, поднимаете немного напряжение на памяти и пробуете со второй.

CAS Latency (CL)
Use this item to adjust the means of memory accessing. Configuration
options: [Auto], [3CLK], [4CLK], [5CLK] and [6CLK]. The default value is[Auto].
TRCD
Use this to adjust TRCD values. Configuration options: [Auto], [3CLK], [4CLK], [5CLK] and [6CLK]. The default value is [Auto].
TRP
Use this to adjust TRP values. Configuration options: [Auto], [3CLK], [4CLK], [5CLK] and [6CLK]. The default value is [Auto].
TRAS
Use this to adjust TRAS values. Configuration options: [Auto], [5CLK] to [18CLK]. The default value is [Auto].
TRTP
Use this to adjust TRTP values. Configuration options: [Auto], [2-4CLK] and [3-5CLK]. The default value is [Auto].
TRRD
Use this to adjust TRRD values. Configuration options: [Auto], [2CLK], [3CLK], [4CLK] and [5CLK]. The default value is [Auto].
TWTR
Use this to adjust TWTR values. Configuration options: [Auto], [1CLK], [2CLK] and [3CLK]. The default value is [Auto].
TWR
Use this to adjust TWR values. Configuration options: [Auto], [3CLK], [4CLK], [5CLK] and [6CLK]. The default value is [Auto].
TRC
Use this to adjust TRC values. Configuration options: [11CLK] to [26CLK]. The default value is [Auto].
TRWTWB
Use this to adjust TRWTWB values. Configuration options: [3CLK] to [10CLK]. The default value is [Auto].
TRWTTO
This option appears only when you adopt AM2 CPU. Use this to adjust TRWTTD values. Configuration options: [Auto], [2CLK], [3CLK], [4CLK],
[5CLK], [6CLK], [7CLK], [8CLK] and [9CLK]. The default value is [Auto].
TWRRD
This option appears only when you adopt AM2 CPU. Use this to adjust TWRRD values. Configuration options: [Auto], [0CLK], [1CLK], [2CLK] and
[3CLK]. The default value is [Auto].
TWRWR
This option appears only when you adopt AM2 CPU. Use this to adjust TWRWR values. Configuration options: [Auto], [1CLK], [2CLK] and [3CLK].
The default value is [Auto].
TRDRD
This option appears only when you adopt AM2 CPU. Use this to adjust TRWTTD values. Configuration options: [Auto], [2CLK], [3CLK], [4CLK] and
[5CLK]. The default value is [Auto].
TRFC0
Use this to adjust TRFC0 values. Configuration options: [Auto], [75ns], [105ns], [127.5ns], [195ns] and [327.5ns]. The default value is [Auto].
TRFC1
Use this to adjust TRFC1 values. Configuration options: [Auto], [75ns], [105ns], [127.5ns], [195ns] and [327.5ns]. The default value is [Auto].
MA Timing
Use this to adjust values for MA timing. Configuration options: [Auto], [2T], [1T]. The default value is [Auto].

Биос игнорирует мои настройки и сам выставляет наименьшие из двух планок...