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AMD 790GX User's Manual
3.9 D32, D33 LEDs introduction
3.8 JP1/JP2/JP3/JP4 Jumper
1-2
（
Default
）
Normal
PCIE1 slot: x16 / PCIE3 slot: Disabled
2-3
CrossFire PCIE1 slot: x8/ PCIE3 slot: Enabled,
x8
There are 2 LEDs (D32 & D33), located as shown on the picture,
following is the introduction of the status of these 2 LEDs when
INCORRECT CPU & memory combinations are being installed.
LED
Status introduction
D32
When DDR2 and DDR3 memories are installed at
the same time, this LED will light up to warn you,
DDR2 and DDR3 memories CANNOT be installed
simultaneously.
D33
When AM2/AM2+ CPU is being installed with DDR3
memory, this LED will light up to warn you, AM2/
AM2+ CPU doesn't support DDR3 memory.
CrossFire Jumper
