Information for S3 Chipset Users : List of Supported RAMDAC Chips
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## 4. List of Supported RAMDAC Chips

If you have a RAMDAC that is not listed here, be VERY careful not to overdrive it using XF86_S3. Better contact the XFree86 team first to verify that running XF86_S3 will not damage your board.

RAMDACs that are grouped together below are treated as compatible with each other as far as the server is concerned. For example, the server will report `"bt485"` when you actually specify `RAMDAC "bt9485"`, or `"s3_gendac"` when you specify `RAMDAC "ics5300"`.

> `

>     ATT20C409                               ==> RAMDAC "att20c409"

>     ATT20C490                               ==> RAMDAC "att20c490"
>     ATT20C491                               ==> RAMDAC "att20c491"
>     CH8391                                  ==> RAMDAC "ch8391"

>     ATT20C498                               ==> RAMDAC "att20c498"
>     ATT21C498                               ==> RAMDAC "att21c498"

>     ATT22C498                               ==> RAMDAC "att22c498"

>     ATT20C505                               ==> RAMDAC "att20c505"

>     BT485                                   ==> RAMDAC "bt485"
>     BT9485                                  ==> RAMDAC "bt9485"

>     IBMRGB514                               ==> RAMDAC "ibm_rgb514"
>     IBMRGB525                               ==> RAMDAC "ibm_rgb525"

>     IBMRGB524                               ==> RAMDAC "ibm_rgb524"
>     IBMRGB526                               ==> RAMDAC "ibm_rgb526"

>     IBMRGB528                               ==> RAMDAC "ibm_rgb528"

>     S3_GENDAC                               ==> RAMDAC "s3gendac"
>     ICS5300                                 ==> RAMDAC "ics5300"

>     S3_SDAC                                 ==> RAMDAC "s3_sdac"
>     ICS5342                                 ==> RAMDAC "ics5342"

>     S3_TRIO32                               ==> RAMDAC "s3_trio32"

>     S3_TRIO64                               ==> RAMDAC "s3_trio64"
>     S3_TRIO64                               ==> RAMDAC "s3_trio"

>     SC11482                                 ==> RAMDAC "sc11482"
>     SC11483                                 ==> RAMDAC "sc11483"
>     SC11484                                 ==> RAMDAC "sc11484"

>     SC11485                                 ==> RAMDAC "sc11485"
>     SC11487                                 ==> RAMDAC "sc11487"
>     SC11489                                 ==> RAMDAC "sc11489"

>     SC15025                                 ==> RAMDAC "sc15025"

>     STG1700                                 ==> RAMDAC "stg1700"

>     STG1703                                 ==> RAMDAC "stg1703"

>     TI3020                                  ==> RAMDAC "ti3020"

>     TI3025                                  ==> RAMDAC "ti3025"

>     TI3026                                  ==> RAMDAC "ti3026"

>     None of the above                       ==> RAMDAC "normal"

> `

If you feel adventurous you could also open up your computer and have a peek at your RAMDAC. The RAMDAC is usually one of the larger chips (second or third largest chip that is NOT an EPROM) on the board. The markings on it are usually

> `

>       <Company logo>

>           <company identifier><part number>-<speed grade>
>           <manufacturing week><manufacturing year>
>           <lot number><other funny numbers>

> `

For example:

> `

>               @@
>               @@ AT&T

>             ATT20C490-11
>              9339S ES
>               9869874

> `

This is an AT&T 20C490 with a speed grade of 110 MHz. This would then mean that you put a ``DacSpeed 110`' line in your `XF86Config` file. Be advised that some RAMDACs have different modes that have different limits. The manufacturer will always mark the chip naming the higher limits, so you should be careful. The S3 server knows how to handle the limits for most of the RAMDACs it supports providing the DacSpeed is specified correctly.

Chips labeled -80 or -8 should use ``DacSpeed 80`' in the device section.

> `

>     S3 86C716-ME SDAC  ==>  DacSpeed 110
>     SC15025-8          ==>  DacSpeed  80
>     ATT20C490-80       ==>  DacSpeed  80

>     IBM 8190429        ==>  DacSpeed 170
>     IBM 03H5428        ==>  DacSpeed 170
>     IBM 03H6447        ==>  DacSpeed 170
>     IBM 03H6448        ==>  DacSpeed 220
>     IBM 03H5319        ==>  DacSpeed 220
>     IBM 63G9902        ==>  DacSpeed 250

>     IBM 37RGB514CF17   ==>  DacSpeed 170
>     IBM 37RGB524CF22   ==>  DacSpeed 220
>                   ^

> `

Information for S3 Chipset Users : List of Supported RAMDAC Chips
Previous: List of Supported Clock Chips
Next: Additional Notes