Reply 20 of 42, by feipoa
- Rank
- l33t++
What happens if you try short, short, open for JP8 pins 1-2, 3-4, and 5-6, respectively? The GXM datasheet lists two possible 4x modes, one as 4x (testing) and the other as 4x. I believe the undocumented jumper setting noted above may be for the regular 4x mode. However this board may be very timing sensitive such that 133 Mhz just isn't obtainable. If that jumper setting works at 133 MHz, try for 120 Mhz.
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