I can't config my Xorg 6.8.0 to use 1024x768 at 60 mode

[=?gb2312?q?=FFffffffffffd3=FFffffffffffee=20=FFffffffffffb8=FFffffffffffd?= f?=]

I don't know if it's a bug of 6.8.0.But 1024x768 at 60
Mode works so good in Xorg 6.7.0 and XFree 4.4.99.13.
My System is:

Gentoo Linux 2004.2 (GCC
3.4.1-r2,nitro-sources-2.6.9-rc1-r4)
Duron 800
512M SDRAM
ATI Radeon LE
Envision 5En
SIS 735 Chipset

There's a xorg.conf of mine in the Attachment

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